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  • 1.
    Ahmed, Mukhtiar
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Fluorine-Free Ionic Liquids and Electrolytes: From Synthesis to Energy Storage Applications2023Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Since their introduction by Sony in 1990, lithium-ion batteries (LIBs) have acquired a sizable market share. They have the best energy densities, a high open circuit voltage, a low self-discharge rate, no memory effect, and a slow loss of charge when not in use. These properties make them the most popular rechargeable batteries for portable gadgets, electric vehicles and aerospace applications. They do, however, pose major safety issues since the conventional electrolytes are made of fluorinated salts dissolved in volatile organic solvents, the former being meta-stable at ambient temperature and the latter being flammable with a high vapour pressure. Thus, there is an urge to develop thermally and electrochemically stable non-fluorinated electrolytes to improve the safety and performance of batteries. Electrolytes based on ionic liquids (ILs) offer a range of advantages over traditional electrolytes including low volatility and high thermal and electrochemical stabilities, and can additionally be made fluorine-free and task-specific. In addition, the transport properties of ILs can be controlled by structural design of chemical functionalities to reduce the ionic interactions and enhance the ion mobilities.

    This thesis is focussed on the development of new fluorine-free ILs and electrolytes for safer energy storage applications. An overview of synthesis, physicochemical and electrochemical characterizations of six different families of ILs and their structurally analogous electrolytes based on the aromatic heterocyclic rings, oligoether based aromatic and aliphatic carboxylates, oligoether phosphates and aromatic sulfonyl anions coupled with n- tetrabutylphosphonium-, imidazolium-, pyrrolidinium-based and alkali metal cations is presented. The structures and purity of the new anions, their intermediate products and the ILs are characterized by using multinuclear NMR, FTIR and mass spectrometry. These studies are further complemented by using NMR diffusometry to investigate the relative anion and anion mobilities and understand the possible interaction mechanisms between the oppositely charged ions within the ILs and the electrolytes, and especially, the influence of Li+ addition in the IL-based electrolytes. Among the synthesized ILs, the sulfonyl-based ILs revealed highest thermal stabilities, aromatic oligoether-based ILs showed the best electrochemical stabilities and aromatic sulfonyl -based ILs exhibited highest ionic conductivities. Some of the synthesized salts displayed promising performance as electrolytes in energy storage devices.

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    Publikationen är tillgänglig i fulltext från 2024-10-01 12:00
  • 2.
    Ahmed, Mukhtiar
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Bhowmick, Sourav
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Filippov, Andrei
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Johansson, Patrik
    Materials Physics, Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden.
    Shah, Faiz Ullah
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Ionic Liquids and Electrolytes with Flexible Aromatic Anions2023Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 29, nr 41, artikel-id e202301000Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Five new n-tetrabutylphosphonium (P4444)+ cation based ionic liquids (ILs) with oligoether substituted aromatic carboxylate anions have been synthesized. The nature and position of the oligoether chain affect thermal stability (up to 330 ºC), phase behaviour (Tg < -55 ºC) and ion transport. Furthermore, with the aim of application in lithium batteries, electrolytes were created for two of the ILs by 10 mol% doping using the corresponding Li-salts. This affects the ion diffusion negatively, from being higher and equal for cations and anions to lower for all ions and unequal. This is due to the stronger ionic interactions and formation of aggregates, primarily between the Li+ ions and the carboxylate group of the anions. Electrochemically, the electrolytes have electrochemical stability windows up to 3.5 V, giving some promise for battery application.

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  • 3.
    Akbar, Kamran
    et al.
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, 30172 Italy.
    Moretti, Elisa
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, 30172 Italy.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, 30172 Italy.
    Carbon Dots for Photocatalytic Degradation of Aqueous Pollutants: Recent Advancements2021Ingår i: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 9, nr 17, artikel-id 2100532Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    The immense progress of humanity on the technological, domestic, and industrial fronts comes at the cost of polluting the planet. Aquatic pollution is particularly dangerous since all life forms are directly linked to it. Each year tons of industrial and domestic pollutants make their way into aqueous systems. Efficient removal/degradation of these pollutants is of prime importance for the sustainable future. Among many technologies, photodegradation is an emerging and promising method for the successful removal of aqueous pollutants since it is powered by abundant solar light. The last decade had shown that carbon dots are among the most promising materials that can be utilized as an efficient tool to derive various solar-driven chemical reactions. Carbon dots possess unique photophysical and chemical properties such as light-harvesting over a broad-spectrum region, upconversion photoluminescence, photosensitizers, chemical inertness, and bivalent redox character, etc. The ease of synthesis of carbon dots at low cost also contributes hugely to their utilizations as an efficient photocatalyst for the degradation of aqueous pollutants. This review summarizes the recent progress made in the field of photodegradation of aqueous pollutants with the aid of carbon dots and their hybrids, highlighting the critical role carbon dots can play in the field. 

  • 4.
    Alay-e-Abbas, Syed Muhammad
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Computational Materials Modeling Laboratory, Department of Physics, Government College University, Faisalabad, 38040, Pakistan.
    Abbas, Ghulam
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Zulfiqar, Waqas
    Computational Materials Modeling Laboratory, Department of Physics, Government College University, Faisalabad, 38040, Pakistan; Department of Energy Conversion and Storage, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark.
    Sajjad, Muhammad
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates.
    Singh, Nirpendra
    Department of Physics, Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates; Center for Catalysis and Separation (CeCaS), Khalifa University of Science and Technology, Abu Dhabi, 127788, United Arab Emirates.
    Larsson, J. Andreas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Structure inversion asymmetry enhanced electronic structure and electrical transport in 2D A3SnO (A = Ca, Sr, and Ba) anti-perovskite monolayers2023Ingår i: Nano Reseach, ISSN 1998-0124, E-ISSN 1998-0000, Vol. 16, nr 1, s. 1779-1791Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Anti-perovskites A3SnO (A = Ca, Sr, and Ba) are an important class of materials due to the emergence of Dirac cones and tiny mass gaps in their band structures originating from an intricate interplay of crystal symmetry, spin-orbit coupling, and band overlap. This provides an exciting playground for modulating their electronic properties in the two-dimensional (2D) limit. Herein, we employ first-principles density functional theory (DFT) calculations by combining dispersion-corrected SCAN + rVV10 and mBJ functionals for a comprehensive side-by-side comparison of the structural, thermodynamic, dynamical, mechanical, electronic, and thermoelectric properties of bulk and monolayer (one unit cell thick) A3SnO anti-perovskites. Our results show that 2D monolayers derived from bulk A3SnO anti-perovskites are structurally and energetically stable. Moreover, Rashba-type splitting in the electronic structure of Ca3SnO and Sr3SnO monolayers is observed owing to strong spin-orbit coupling and inversion asymmetry. On the other hand, monolayer Ba3SnO exhibits Dirac cone at the high-symmetry Γ point due to the domination of band overlap. Based on the predicted electronic transport properties, it is shown that inversion asymmetry plays an essential character such that the monolayers Ca3SnO and Sr3SnO outperform thermoelectric performance of their bulk counterparts.

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  • 5.
    Alberoni, Chiara
    et al.
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, Italy.
    Barroso-Martín, Isabel
    Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
    Infantes-Molina, Antonia
    Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
    Rodríguez-Castellón, Enrique
    Departamento de Química Inorgánica, Cristalografía y Mineralogía (Unidad Asociada al ICP-CSIC), Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain.
    Talon, Aldo
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, Italy.
    Zhao, Haiguang
    Qingdao University – College of Physics & State Key Laboratory of Bio-Fibers and Eco-Textiles, 308 Ningxia Road, Qingdao 266071, P. R. China.
    You, Shujie
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, Italy.
    Moretti, Elisa
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, Venezia Mestre, Italy.
    Ceria doping boosts methylene blue photodegradation in titania nanostructures2021Ingår i: Materials Chemistry Frontiers, E-ISSN 2052-1537, Vol. 5, nr 11, s. 4138-4152Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ceria-doped titania photocatalysts (ceria loading 0.25–5.0 wt%) were synthesized by hydrothermal methods for water remediation. Nanotubes (CeTNTx) and nanoparticles (CeTNPx) were obtained. Ceria doping was applied to tune the electronic properties of nanostructured titania, boosting its photocatalytic activity. CeTNT nanostructures contained anatase as the only titania phase, whereas the CeTNP series consisted of both anatase and rutile polymorphs. The Ce addition induced a decrease in the energy gap, allowing enhancement of visible light harvesting. The photodegradation of methylene blue, MB, in aqueous solution was chosen to study the influence of the morphology and the ceria loading on the photocatalytic response, under UV and solar light. Both CeO2–TiO2 nanoparticles and nanotubes were found to be very active under UV light. The highest MB degradation rates were obtained for the 0.25 wt% CeO2 doping, for both nanotubes and nanoparticles (0.123 and 0.146 min−1, respectively), able to photodegrade completely the dye after 120 min. The two samples are stable after a 3-cycle reusability test. The photo-response under simulated solar light confirmed that doping titania with ceria allows harvesting visible light absorption, enhancing its photoactivity. A maximum efficiency of 85% under simulated sunlight at a degradation rate of 0.054 min−1 was obtained. Transient photoluminescence confirmed that MB acts as a charge scavenger for the composite system. These results pointed out ceria-doped titania nanostructures as a promising class of photocatalysts for the degradation of dyes and other hazardous organic compounds in wastewater.

  • 6.
    Ali, Asad
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Laaksonen, Aatto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden; Center of Advanced Research in Bionanoconjugates and Biopolymers, ‘‘Petru Poni” Institute of Macromolecular Chemistry, Iasi 700469, Romania; State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Huang, Guo
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Hussain, Shahid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Luo, Shuiping
    College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China.
    Chen, Wen
    College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.
    Shen, Pei Kang
    School of Resources, Environment and Materials, State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, PR China.
    Zhu, Jinliang
    School of Resources, Environment and Materials, State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, PR China.
    Ji, Xiaoyan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Emerging strategies and developments in oxygen reduction reaction using high-performance Platinum-based electrocatalysts2024Ingår i: Nano Reseach, ISSN 1998-0124, E-ISSN 1998-0000, Vol. 17, nr 5, s. 3516-3532Artikel, forskningsöversikt (Refereegranskat)
  • 7.
    Ali, Asad
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China; School of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, PR China.
    Liang, Fengxing
    School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China.
    Feng, Huiyan
    School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China; School of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, PR China.
    Tang, Mei
    School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China.
    Jalil Shah, Syed
    School of Chemistry & Chemical Engineering, Guangxi University, Nanning 530004, PR China.
    Ahmad, Fawad
    Department of Chemistry, University of Wah, Quaid Avenue, Wah Cantt, (47010), Punjab, Pakistan.
    Ji, Xiaoyan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Kang Shen, Pei
    School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China.
    Zhu, Jinliang
    School of Resources, Environment and Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004 Guangxi, P. R. China, Guangxi University, Nanning 530004, PR China.
    Gram-scale production of in-situ generated iron carbide nanoparticles encapsulated via nitrogen and phosphorous co-doped bamboo-like carbon nanotubes for oxygen evolution reaction2023Ingår i: Materials Science for Energy Technologies, E-ISSN 2589-2991, Vol. 6, s. 301-309Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Optimizing electrocatalytic activity and recognizing the most reactive sites for oxygen evolution reaction (OER) electrocatalysts are valuable to the order of renewable power. In this research article, we explored an innovative in-situ annealing technique for constructing iron carbide nanoparticles (Fe3C NPs) encapsulated via nitrogen and phosphorous doped bamboo-shape carbon nanotubes (NP-CNTs) for OER. Interestingly, the constructed Fe3C NPs@NP-CNT-800 composite exhibited remarkable electrochemical operation and offered a stable current density of 10 mA/cm2 at a lower overpotential (280 mV) in an alkaline solution. Furthermore, an innovative Fe3C NPs@N,P-CNT-800 hybrid surpassed the standard RuO2 electrocatalyst in terms of OER performance and showed negligible degradation in chronoamperometric (21 h) and chronopotentiometry (3000 cycles) analyses. The remarkable performance and stability are ascribed to the Fe3C NPs, novel tubular bamboo-like morphology of its carbon materials, and heteroatom doping, which contribute to the electrochemical interfaces, large surface area, active catalytic sites, and rapid charge transfer kinetics.

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  • 8.
    Ali, Salamat
    et al.
    School of Materials and Energy, Lanzhou University, Lanzhou 730000, China.
    Ahmad, Awais
    Department of Chemistry, The University of Lahore, Lahore, 54590, Pakistan; Departamento de Química Orgánica, Universidad de Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie (C3), E-14014 Córdoba, Spain.
    Hussain, Iftikhar
    Department of Mechanical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong.
    Shah, Syed Shoaib Ahmad
    Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology, Islamabad 44000, Pakistan.
    Ali, Shafqat
    Department of Physics, Shah Abdul Latif University Khairpur, Khairpur, Sindh, 66202, Pakistan.
    Ali, Asad
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Javed, Muhammad Sufyan
    Department of Chemistry, The University of Lahore, Lahore, 54590, Pakistan; School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
    Experimental and Theoretical Aspects of MXenes-Based Energy Storage and Energy Conversion Devices2023Ingår i: Journal of Chemistry and Environment, E-ISSN 2959-0132, Vol. 2, nr 2, s. 54-81Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Transition metal carbides, nitrides, and carbonitrides (MXenes) have become an appealing framework for developing various energy applications. MXenes with van der Waals (vdW) interactions are facile, highly efficient, affordable, and self-assembled features that improve energy density. MXenes exhibit large surface area, high electric conductivity, and excellent electrochemical characteristics for various energy applications. This review summarizes and emphasizes the current developments in MXene with improved performance for energy storage or conversion devices, including supercapacitors (SCs), various types of rechargeable batteries (RBs), solar cells, and fuel cells. We discuss the crystal structures of MXenes properties of MXenes and briefly discuss them for different types of energy applications. Finally, the critical outlook and perspective for the MXene progress for applications in energy applications are also described.

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  • 9.
    Al-Jayyousi, Hiba
    et al.
    Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
    Eswaran, Mathan Kumar
    SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India.
    Ray, Avijeet
    Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India.
    Sajjad, Muhammad
    Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
    Larsson, J. Andreas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Singh, Nirpendra
    Department of Physics, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates; Center for Catalysis and Separations, Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates.
    Exploring the Superior Anchoring Performance of the Two-Dimensional Nanosheets B2C4P2 and B3C2P3 for Lithium-Sulfur Batteries2022Ingår i: ACS Omega, E-ISSN 2470-1343, Vol. 7, nr 43, s. 38543-38549Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Potential anchoring materials in lithium–sulfur batteries help overcome the shuttle effect and achieve long-term cycling stability and high-rate efficiency. The present study investigates the two-dimensional nanosheets B2C4P2 and B3C2P3 by employing density functional theory calculations for their promise as anchoring materials. The nanosheets B2C4P2 and B3C2P3 bind polysulfides with adsorption energies in the range from −2.22 to −0.75 and −2.43 to −0.74 eV, respectively. A significant charge transfer occurs from the polysulfides, varying from −0.74 to −0.02e and −0.55 to −0.02e for B2C4P2 and B3C2P3, respectively. Upon anchoring the polysulfides, the band gap of B3C2P3 reduces, leading to enhanced electrical conductivity of the sulfur cathode. Finally, the calculated barrier energies of B2C4P2 and B3C2P3 for Li2S indicate fast diffusion of Li when recharged. These enthralling characteristics propose that the nanosheets B2C4P2 and B3C2P3 could reduce the shuttle effect in Li–S batteries and significantly improve their cycle performance, suggesting their promise as anchoring materials.

  • 10.
    Alvi, Sajid
    et al.
    Department of Physics, Chalmers University of Technology, Chalmersplatsen 4, 412 96, Göteborg, Sweden.
    Black, Ashley P.
    Institut de Ciència de Materials de Barcelona, ICMAB-CSIC Campus UAB, 08193, Bellaterra, Catalonia, Spain.
    Jozami, Ignacio
    Department of Physics, Chalmers University of Technology, Chalmersplatsen 4, 412 96, Göteborg, Sweden.
    Escudero, Carlos
    NOTOS, ALBA Synchrotron, Cerdanyola del Vallès, 08193, Catalonia, Spain.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Johansson, Patrik
    Department of Physics, Chalmers University of Technology, Chalmersplatsen 4, 412 96, Göteborg, Sweden; ALISTORE-ERI, CNRS FR 3104, Hub de I'Energie, 80039, Amiens Cedex, France.
    Entropy Stabilized Medium High Entropy Alloy Anodes for Lithium-Ion Batteries2024Ingår i: Batteries & Supercaps, E-ISSN 2566-6223, Vol. 7, nr 5, artikel-id e202300585Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    One often proposed route to improved energy density for lithium-ion batteries is to use alloy anodes, such as silicon, able to store large amounts of lithium. Mechanical instability caused by the large expansion and contraction associated with (de)lithiation, and hence bad cyclability, has, however, so far hindered progress. As proof-of-concept of a remedy, we here present BiSbSe1.5Te1.5, a medium high-entropy alloy with improved cycling stability for conversion-alloying (de)lithiation reactions. We attain five to twenty times more stable cycles than previously reported for comparable metal-Se and -Te-based anodes, with a very good reversible capacity (464 mAh g−1) for up to 110 cycles- and this without using any carbonaceous materials to create a composite. Altogether, this highlights how alloy engineering and increased entropy materials can stabilize conversion-alloying electrodes.

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  • 11.
    Alvi, Sajid
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Physics, Chalmers University of Technology, SE‐412 96 Göteborg, Sweden.
    Milczarek, Michal
    Department of Mechanics of Materials (ZMM), Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland.
    Jarzabek, Dariusz M.
    Department of Mechanics of Materials (ZMM), Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland.
    Hedman, Daniel
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1‐1‐1 Umezono, Tsukuba, Ibaraki, 305‐8568 Japan; Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), Ulsan, 44919 Republic of Korea.
    Gilzad Kohan, Mojtaba
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Levintant-Zayonts, Neonila
    Department of Mechanics of Materials (ZMM), Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172 Mestre Venezia, Italy.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Enhanced mechanical, thermal and electrical properties of high‐entropy HfMoNbTaTiVWZr thin film metallic glass and its nitrides2022Ingår i: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 24, nr 9, artikel-id 2101626Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The inception of high-entropy alloy promises to push the boundaries for new alloy design with unprecedented properties. This work reports entropy stabilisation of an octonary refractory, HfMoNbTaTiVWZr, high-entropy thin film metallic glass, and derived nitride films. The thin film metallic glass exhibited exceptional ductility of ≈60% strain without fracture and compression strength of 3 GPa in micro-compression, due to the presence of high density and strength of bonds. The thin film metallic glass shows thermal stability up to 750 °C and resistance to Ar-ion irradiation. Nitriding during film deposition of HfMoNbTaTiVWZr thin film of strong nitride forming refractory elements results in deposition of nanocrystalline nitride films with compressive strength, hardness, and thermal stability of up to 10 GPa, 18.7 GPa, and 950 °C, respectively. The high amount of lattice distortion in the nitride films leads to its insulating behaviour with electrical conductivity as low as 200 S cm−1 in the as-deposited film. The design and exceptional properties of the thin film metallic glass and derived nitride films may open up new avenues of development of bulk metallic glasses and the application of refractory-based high entropy thin films in structural and functional applications.

  • 12.
    An, Rong
    et al.
    Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
    Laaksonen, Aatto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden; Center of Advanced Research in Bionanoconjugates and Biopolymers, “Petru Poni” Institute of Macromolecular Chemistry, Iasi 700469, Romania; State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Wu, Muqiu
    Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
    Zhu, Yudan
    State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Shah, Faiz Ullah
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Lu, Xiaohua
    State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
    Ji, Xiaoyan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Atomic force microscopy probing interactions and microstructures of ionic liquids at solid surfaces2022Ingår i: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, nr 14, s. 11098-11128Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Ionic liquids (ILs) are room temperature molten salts that possess preeminent physicochemical properties and have shown great potential in many applications. However, the use of ILs in surface-dependent processes, e.g. energy storage, is hindered by the lack of a systematic understanding of the IL interfacial microstructure. ILs on the solid surface display rich ordering, arising from coulombic, van der Waals, solvophobic interactions, etc., all giving near-surface ILs distinct microstructures. Therefore, it is highly important to clarify the interactions of ILs with solid surfaces at the nanoscale to understand the microstructure and mechanism, providing quantitative structure–property relationships. Atomic force microscopy (AFM) opens a surface-sensitive way to probe the interaction force of ILs with solid surfaces in the layers from sub-nanometers to micrometers. Herein, this review showcases the recent progress of AFM in probing interactions and microstructures of ILs at solid interfaces, and the influence of IL characteristics, surface properties and external stimuli is thereafter discussed. Finally, a summary and perspectives are established, in which, the necessities of the quantification of IL–solid interactions at the molecular level, the development of in situ techniques closely coupled with AFM for probing IL–solid interfaces, and the combination of experiments and simulations are argued.

  • 13.
    Andersson, Anton
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Brander, Linus
    Division of Built Environment—Infrastructure and Concrete, Research Institute of Sweden, SE-501 15 Borås, Sweden.
    Lennartsson, Andreas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Roos, Ake
    Boliden AB, SE-101 20 Stockholm, Sweden.
    Engström, Fredrik
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    A Method for Synthesizing Iron Silicate Slags to Evaluate Their Performance as Supplementary Cementitious Materials2023Ingår i: Applied Sciences, E-ISSN 2076-3417, Vol. 13, nr 14, artikel-id 8357Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Utilizing iron silicate copper slag as supplementary cementitious material (SCM) is a means to improve resource efficiency and lower the carbon dioxide emissions from cement production. Despite multiple studies on the performance of these slags in SCM applications, the variations in cooling procedure, grinding, and methods for evaluating reactivity limit the ability to assess the influence of chemical composition on reactivity from the literature data. In this study, a methodology was developed to synthesize iron silicate slags, which were then evaluated for their inherent reactivity using the R-3 calorimeter-based experiments. The results demonstrated that laboratory-scale granulation produced the same reactivity as industrially granulated slag. Furthermore, a synthesized triplicate sample showed high repeatability. Based on these two aspects, this method can be used to systematically study the influence of chemical composition on the inherent reactivity of iron silicate slags while producing results that are directly translatable to industrial slags.

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  • 14.
    Babanejad, Safoura
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Ahmed, Hesham
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi. Central Metallurgical Research and Development Institute, P.O. Box 87, Helwan 114 21, Egypt.
    Andersson, Charlotte
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Samuelsson, Caisa
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Lennartsson, Andreas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Hall, Björn
    Stena Recycling International AB, P.O. Box 4088, 400 40 Gothenburg, Sweden.
    Arnerlöf, Linn
    Boliden Smelters, Klarabergsviadukten 90 A, Stockholm, Sweden.
    High-Temperature Behavior of Spent Li-Ion Battery Black Mass in Inert Atmosphere2022Ingår i: Journal of Sustainable Metallurgy, ISSN 2199-3823, Vol. 8, s. 566-581Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The increased demand for Li-ion batteries has prompted the scientific community to improve recycling routes in order to reuse the valuable materials in batteries. After their end-of-life, the batteries are collected, discharged, and mechanically disintegrated, generating plastic and metallic streams that are recycled directly; this leaves behind a small particle size fraction known as black mass (BM). BM is composed mainly of graphite and Li-metal complex oxides. Pyrometallurgy is a route known for recycling of BM, in which identifying the BM’s behavior at high temperatures is essential. In this study, two types of BM are characterized in two fractions of 150–700 µm and smaller than 150 µm. The thermal behavior of the BM is studied with thermal analysis techniques. The analyses demonstrate that the mineralogical and morphological properties of the two fractions do not significantly differ, while the amounts of C and organic materials might vary. When the BM was thermally treated, the binders decomposed until a temperature of 500 ℃ was reached, where the volatilization of hydrocarbons was observed, although F mostly persisted in the BM. The Li-metal oxide was partially reduced to lower oxides and Li carbonate at ⁓ 600 ℃, and the main mass loss was caused by carbothermic reduction immediately thereafter. As the products of this process, metallic Co and Ni phases were formed, and part of the graphite remained unreacted. Regarding the Li behavior, it was observed that in the presence of Al, AlLiO2 is the most likely composition to form, and it changes to LiF by increasing the F concentration in the composition.

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  • 15.
    Belay Ibrahim, Kassa
    et al.
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.
    Ahmed Shifa, Tofik
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.
    Zorzi, Sandro
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.
    Getaye Sendeku, Marshet
    Ocean Hydrogen Energy R&D Center, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, PR China.
    Moretti, Elisa
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Emerging 2D materials beyond mxenes and TMDs: Transition metal carbo-chalcogenides2024Ingår i: Progress in Materials Science, ISSN 0079-6425, E-ISSN 1873-2208, Vol. 144, artikel-id 101287Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Interestingly, it opens the door for the development of the 2D materials family, which includes different classes of 2D materials. Among them, transition metal dichalcogenides (TMDs) and transition metal carbide MXenes (TMCs) have emerged. TMDs have unique layered structures, low cost, and are composed of earth abundant elements, but their poor electronic conductivity, poor cyclic stability, their structural and morphological changes during electrochemical measurements hinder their practical use. Recently, TMC MXenes have garnered attention in the 2D material world, but the issue of restacking and aggregation limits their direct use in large-scale energy conversion and storage. To address these challenges, hetero structures based on conductive TMCs MXenes and electrochemically active TMDs have emerged as a promising solution. However, understanding the solid/solid interface in heterostructured materials remains a challenge. To tackle this, 2D single component crystals with high capacity, low diffusion barrier, and good electronic conductivity are highly sought. The emergence of transition metal carbo-chalcogenides (TMCCs) has provided a potential solution, as these 2D nanosheets consist of TM2X2C, where TM represents transition metal, X is either S or Se, and C atom. This new class of 2D materials serves as a remedy by avoiding the challenges related to solid/solid interfaces often encountered in heterostructures. This review focuses on the latest developments in TMCCs, including their synthetic strategies, surface/interface engineering, and potential application in batteries, water splitting, and other electro-catalytic processes. The challenges and future perspectives of the design of TMCCs for electrochemical energy conversion and storage are also discussed.

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  • 16.
    Bhatti, Adeel Liaquat
    et al.
    Institute of Physics University of Sindh Jamshoro, 76080, Sindh Pakistan.
    Tahira, Aneela
    Dr. M.A Kazi Institute of Chemistry University of Sindh Jamshoro, 76080, Sindh Pakistan.
    Gradone, Alessandro
    Institute for Microelectronics and Microsystems, Italian National Research Council, Section of Bologna, Via Piero Gobetti 101, 40129, Bologna, Italy; Department of Chemistry “G.Ciamician”, University of Bologna, Via Selmi 2, 40126, Bologna, Italy.
    Mazzaro, Raffaello
    Institute for Microelectronics and Microsystems, Italian National Research Council, Section of Bologna, Via Piero Gobetti 101, 40129, Bologna, Italy; Department of Physics and Astronomy “A. Righi”, University of Bologna, Via Berti Pichat 6/2, 40127, Bologna, Italy.
    Morandi, Vittorio
    Institute for Microelectronics and Microsystems, Italian National Research Council, Section of Bologna, Via Piero Gobetti 101, 40129, Bologna, Italy.
    aftab, Umair
    Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, 7680 Jamshoro, Sindh Pakistan.
    Abro, Muhammad Ishaq
    Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, 7680 Jamshoro, Sindh Pakistan.
    Nafady, Ayman
    Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
    Qi, Kezhen
    Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China.
    Infantes-Molina, Antonia
    Department of Inorgnic Chemistry, Crystallography and Mineralogy. (Unidad Asociada al ICP-CSIC), Faculty of Sciences, University of Malaga, Campus de Teatinos, 29071 Malaga, Spain..
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172 Venezia Mestre, Italy.
    Ibupoto, Zafar Hussain
    Dr. M.A Kazi Institute of Chemistry University of Sindh Jamshoro, 76080, Sindh Pakistan.
    Nanostructured Co3O4 electrocatalyst for OER: The role of organic polyelectrolytes as soft templates2021Ingår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 398, artikel-id 139338Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Designing an efficient electrocatalyst for the oxygen evolution reaction (OER) in alkaline media is highly needed but very challenging task. Herein, we used organic polyelectrolytes such as (carboxymethyl cellulose) CMC and polyacrylamide polymers for the growth of Co3O4 nanostructures by aqueous chemical growth method. The morphology and composition studies were performed on scanning electron microscopy (SEM), energy dispersive X-ray (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM) techniques. The structural properties and the surface chemistry of the Co3O4 electrocatalysts were correlated to the OER performance, and the enhancement mechanism with respect to pristine Co3O4 was observed to be specifically related to the polyelectrolyte templating role.

    Co3O4@CMC composites displayed reduced crystallite size, producing OER overpotential as low as 290 mV at 10 mAcm−2 in 1.0 KOH and Tafel slope of 71 mVdec−1, suggesting fast transfer of intermediates and electrons during water electrolysis. On the other hand, the use of polyacrylamide and its different templating mechanism resulted in similar crystallite size, but preferential exposed faces and larger surface vacancies content, as demonstrated by HR-TEM and XPS, respectively. Consistently, this material displays cutting-edge OER performance, such as overpotential of 260 mV at 10 mAcm−2 and a low Tafel slope of 63 mVdec−1. The proposed strategy for the preparation of Co3O4 nanostructures in the presence of CMC and polyacrylamide is facile, mass production, thus it could equally contributed towards the realization of hydrogen energy. Therefore, these nanostructures of Co3O4 can be regarded as an alternative and promising materials for the different electrochemical applications including fuel cells, metal air batteries, overall water electrolysis and other energy storage devices.

  • 17.
    Bhowmick, Sourav
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Tatrari, Gaurav
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Filippov, Andrei
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Johansson, Patrik
    Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; ALISTORE-European Research Institute, CNRS FR 3104, Hub de l’Energie, 80039 Amiens, France.
    Shah, Faiz Ullah
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Structurally Flexible Pyrrolidinium- and Morpholinium-based Ionic Liquid Electrolytes2023Ingår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 25, nr 29, s. 19815-19823Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ion transport measures and details as well as physico-chemical and electrochemical properties are presented for a small set of structurally flexible pyrrolidinium (Pyrr) and morpholinium (Morph) cation-based ionic liquids (ILs), all with oligoether phosphate-based anions. All have high thermal stabilities, low glass transition temperatures, and wide electrochemical stability windows, but rather moderate ionic conductivities, whereas both the anions and the cations of the Pyrr-based ILs diffuse faster than those of the Morph-based ILs. Overall the former ILs have significantly more promise as high-temperature supercapacitor electrolytes, rendering a specific capacitance of 164 F g−1 at 1 mV s−1, a power density of 241 W kg−1 and a specific energy density of 30 Wh kg−1 at 90 °C in a symmetric graphite supercapacitor.

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  • 18.
    Birdsong, Björn K.
    et al.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Wu, Qiong
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Hedenqvist, Mikael S.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Capezza, Antonio J.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Andersson, Richard L.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Svagan, Anna J.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Das, Oisik
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Mensah, Rhoda Afriyie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Olsson, Richard T.
    Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Flexible and fire-retardant silica/cellulose aerogel using bacterial cellulose nanofibrils as template material2024Ingår i: Materials Advances, E-ISSN 2633-5409Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study explores the possibility of using various silsesquioxane precursors such as (3-aminopropyl) triethoxysilane (APTES), methyltrimethoxysilane (MTMS), and tetraethyl orthosilicate (TEOS) to produce silsesquioxane-bacterial cellulose nanofibre (bCNF) aerogels. Each precursor allowed to customize the aerogel properties, leading to unique properties suitable for various applications requiring lightweight insulative materials. When utilizing APTES as the silsesquioxane precursor, an aerogel capable of over 90% recovery after compression was formed, making them suitable for flexible applications. When MTMS was used as the precursor, the aerogel retained some compression recovery (80%) but had the added property of superhydrophobicity with a contact angle over 160° due to the presence of CH3 functional groups, enabling water-repellence. Finally, TEOS allowed for excellent thermal insulative properties with a low Peak Heat Release Rate (PHRR), making it a promising candidate for fire-resistant applications. The customization of these aerogel materials was attributed to a combination of the chemical composition of the silsesquioxane precursors and the morphology of the coated bacterial cellulose nanofibres (bCNF), such as CH3 groups found in MTMS enabled for superhydrophobicity. Differences in morphology, such as uniform and smooth silsesquioxane coatings when using APTES or a “pearl-necklace” morphology using TEOS, enabled either compression recovery and flexibility or low thermal conduction. This investigation of silsesquioxane-bCNF provides a good understanding of the importance of the choice of precursor effect on insulating aerogel properties.

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  • 19.
    Bu, Xiangning
    et al.
    Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, China.
    Danstan, January Kadenge
    Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, China.
    Hassanzadeh, Ahmad
    Department of Geoscience and Petroleum, Faculty of Engineering Science, Norwegian University of Science and Technology, Trondheim, Norway; Maelgwyn Mineral Services Ltd, Cardiff, UK.
    Behrad Vakylabad, Ali
    Department of Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
    Chelgani, Saeed Chehreh
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Metal extraction from ores and waste materials by ultrasound-assisted leaching -an overview2024Ingår i: Mineral Processing and Extractive Metallurgy Review, ISSN 0882-7508, E-ISSN 1547-7401, Vol. 45, nr 1, s. 28-45Artikel, forskningsöversikt (Refereegranskat)
  • 20.
    Chakraborty, Arpita
    et al.
    Dept. of CSE, Chittagong University of Engineering and Technology, Chattogram 4349, Bangladesh.
    Chakraborty, Aditya
    Dept. of EEE, Chittagong University of Engineering and Technology, Chattogram 4349, Bangladesh.
    Khan, Fariba Tasnia
    Computer Science and Engineering, Southern University Bangladesh, Chattogram 4201, Bangladesh.
    Mahmud, Tanjim
    Dept. of CSE, Rangamati Science and Technology University, Rangamati 4500, Bangladesh.
    Hossain, Mohammad Shahadat
    Dept. of CSE, University of Chittagong, Chittagong 4331, Bangladesh.
    Andersson, Karl
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Optimizing Tandem Solar Cell Efficiency: A Perovskite-CIGS Approach2024Ingår i: 2024 Second International Conference on Emerging Trends in Information Technology and Engineering (ICETITE), IEEE, 2024Konferensbidrag (Refereegranskat)
    Abstract [en]

    Tandem solar cells combining perovskite and CIGS have rapidly gained prominence as highly efficient photovoltaic devices. Recent advancements in enhancing their efficiency in-volve adjusting the thickness of distinct layers with tunable bandgaps, demonstrating superior performance compared to al-ternative tandem solar cells. The upper cell, employing perovskite material chosen for its excellent light absorption coefficient and optoelectronic properties, collaborates with the bottom CIGS cell, characterized by a tunable bandgap and low thermal requirements, contributing significantly to overall efficiency improvement. Through numerical simulations conducted with wxAMPS software, our proposed model, which incorporates a 3μm thick perovskite absorber layer as the upper cell and a 3.5μm thick CIGS absorber layer as the lower cell, demonstrated outstanding power conversion efficiency of 40.0209%, Voc of 1.8675 V, Jsc of 23.2146 mA/cm2, and FF of 92.3152

  • 21.
    Chandrasekaran, Sundaram
    et al.
    Guangxi Key Laboratory of Electrochemical and Magneto-chemical, Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, PR China; College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
    Zhang, Chenle
    College of Julong, Shenzhen Technology University, Shenzhen Guangdong 518118, PR China.
    Shu, Yiqing
    Key Laboratory of Optoelectronic Devices, Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
    Wang, Huide
    Key Laboratory of Optoelectronic Devices, Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
    Chen, Sanming
    College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
    Edison, Thomas Nesakumar Jebakumar Immanuel
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Liu, Yongping
    Guangxi Key Laboratory of Electrochemical and Magneto-chemical, Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, PR China.
    Namachivayam, Karthik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Misra, R.D.K.
    College of Engineering Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, Texas 79968, USA.
    Deng, Libo
    College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
    Yin, Peng
    Key Laboratory of Optoelectronic Devices, Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
    Ge, Yanqi
    Key Laboratory of Optoelectronic Devices, Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
    Al-Hartomy, Omar A.
    Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
    Al-Ghamdi, Ahmed
    Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
    Wageh, Swelm
    Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
    Zhang, Peixin
    College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
    Bowen, Chris
    Department of Mechanical Engineering, University of Bath, BA2 7AY Bath, UK.
    Han, Zhang
    Key Laboratory of Optoelectronic Devices, Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
    Advanced opportunities and insights on the influence of nitrogen incorporation on the physico-/electro-chemical properties of robust electrocatalysts for electrocatalytic energy conversion2021Ingår i: Coordination chemistry reviews, ISSN 0010-8545, E-ISSN 1873-3840, Vol. 449, artikel-id 214209Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    The use of a wide range of methods for incorporating nitrogen atoms on robust catalysts has given rise to fundamental advances in the field of energy conversion and storage. Recently, nitrogen incorporation has proven to be able to fine-tune the electron densities of exposed active sites to create high-performance electrocatalysts. The preservation of a strong interface between the local atomic coordination of nitrogen atoms on bare carbon, single metal atoms, transition metal oxides, metal chalcogenides, and MXenes during synthesis plays an important role in producing an efficient electrocatalysts. In addition, the ability of nitrogen atoms to bind with carbon or metal atoms can be influenced by processing conditions. In this regard, this review is the first comprehensive overview of the range of synthetic strategies to form nitrogen incorporated catalysts and assess their chemical, structural, physical electronic property modification and their influence on electrocatalytic ORR, OER, and HER performance. This review will describe how specific strategies have been utilized to realise effective electrocatalytic systems, including the energy conversion of nitrogen incorporated catalysts, structural coordination, and material optimization. Finally, the main challenges to be considered in future investigations in order to initiate new research efforts in this promising research area are discussed.

  • 22.
    Chen, Jun
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Marklund, Pär
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Björling, Marcus
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Shi, Yijun
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    In-situ polymerized siloxane urea enhanced graphene-based super-fast, durable, all-weather elec-photo-thermal anti-/de-icing coating2023Ingår i: Journal of Science: Advanced Materials and Devices, ISSN 2468-2284, Vol. 8, nr 3, artikel-id 100604Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Previous investigations on anti-/de-icing techniques have primarily focused on mild laboratory conditions, which have limited practical applicability due to their short service life. Consequently, there is an urgent demand for the development of durable anti-/de-icing technologies capable of withstanding complex environmental conditions. In this research endeavour, we have successfully formulated a hydrophobic coating based on graphene. To circumvent the challenges associated with environmentally unfriendly organic solvents, we utilized a graphene water slurry as the foundational material and subsequently incorporated a poly (vinyl alcohol)-water solution. The resulting solution was subjected to in situ polymerization of a siloxane urea crosslinked polymer, yielding the desired coating solution. Following a solution spraying and drying process, the ultimate product obtained was the hydrophobic conductive graphene (HCG) siloxane Coating. The HCG siloxane Coating exhibits a conductivity of 66 S/m, enabling it to melt ice droplets within a mere 10 s, whereas conventional coatings require 20–500 s for the same task. A comprehensive field test conducted during an entire winter period on a high mountain situated within the Arctic Circle in Finland demonstrated the excellent anti-icing properties of the developed coating when subjected to approximately 310 W/m2 power. Furthermore, the coating exhibited satisfactory de-icing performance under approximately 570 W/m2 power, successfully removing ice accumulations within approximately 10 min. Throughout the field test, temperatures frequently plummeted to −20 °C, accompanied by wind speeds reaching up to 12 m/s. Material characterization revealed that the micro-nano structure of the coating surface, which engenders favourable hydrophobic behaviour, was primarily attributed to the phase separation resulting from hydrophilic and hydrophobic interactions. Moreover, the semi-interpenetrating structure formed by the polyvinyl alcohol molecular chains and in-situ polymerized siloxane urea ensured the coating's strength.

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  • 23.
    Chen, Yuran
    et al.
    School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
    Li, Pan
    School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
    Bu, Xiangning
    School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
    Wang, Liqiang
    School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
    Liang, Xuemin
    School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China.
    Chelgani, Saeed Chehreh
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    In-depth purification of spent pot-lining by oxidation-expansion acid leaching: A comparative study2022Ingår i: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 303, artikel-id 122313Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Spent pot lining (SPL) is a hazardous solid waste generated after overhauling the aluminum electrolytic cell. SPL contains carbon resources with high graphitization and toxic impurities, such as NaF, Na3AlF6, and CaF2. These toxic substances are difficult to remove from graphite completely. This study introduces an innovative method of oxidation-expansion acid leaching (OEAL) to eliminate impurities inside the graphitized carbon. For such a purpose, typical purification methods (conventional leaching, flotation-acid leaching) were investigated and compared to OEAL. The experimental outcomes indicated that the process efficiency for removing SPL impurities by various methods had the following sequence from high to low: OEAL > flotation-acid leaching > conventional leaching. The maximum SPL impurities removal rate by conventional leaching and flotation-acid leaching was 89.65 %, while it was 99.36 % with the OEAL method. For understanding fundamental aspects of the SPL impurity removal, their rejection mechanisms in the examined methods were systematically studied by different instrumentals and chemical analysis techniques. As a result of the reaction between H+ and residuals during OEAL process, the distance between graphitized carbon layers expands. This expansion resulted in a qualitative improvement in the SPL impurity removal by OEAL, making SPL one of the graphite or graphene oxide resources.

  • 24.
    Concina, Isabella
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    An Old Material for a New World: Prussian Blue and Its Analogues as Catalysts for Modern Needs2024Ingår i: Inorganics, E-ISSN 2304-6740, Vol. 12, nr 4, artikel-id 124Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Prussian blue analogues (PBAs) have recently emerged as effective materials in different functional applications, ranging from energy storage to electrochemical water splitting, thence to more “traditional” heterogeneous catalysis. Their versatility is due to their open framework, compositional variety, and fast and efficient internal charge exchange, coupled with a self-healing ability that makes them unique. This review paper presents and discusses the findings of the last decade in the field of the catalytic and photocatalytic application of PBAs in water remediation (via the degradation of organic pollutants and heavy metal removal) and the catalytic oxidation of organics and production or organic intermediates for industrial synthesis. Analysis of the catalytic processes is approached from a critical perspective, highlighting both the achievements of the research community and the limits still affecting this field.

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  • 25.
    Das, Himadri Tanaya
    et al.
    Center of Excellence in Advanced Materials and Applications, Department of Physics, Vanivihar, Bhubaneswar, 751004, India.
    Babu, Sreejith P.
    Electrochemistry for Energy & Environment Group, School of Physical and Chemical Sciences, North-West University, Potchefstroom, 2520, South Africa.
    Mondal, Aniruddha
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Naresh, Nibagani
    Department of Materials Engineering and Convergence Technology, School of Material Science and Engineering, Gyeongsang National University, 108-402, 501, Jinju-si, Gyeongsangnam-do, Republic of Korea.
    Balaji T., Elango
    Department of Chemical Engineering, National Taiwan University of Science and Technology, Section 4, Keelung Rd, Da'an, Taipei, 106, Taiwan.
    Das, Nigamananda
    Department of Chemistry, Utkal University, Vani Vihar, Bhubaneswar, 751004, India.
    2D-layered graphitic carbon nitride nanosheets for electrochemical energy storage applications2024Ingår i: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 603, artikel-id 234374Artikel, forskningsöversikt (Refereegranskat)
  • 26.
    Das, Oisik
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Mensah, Rhoda Afriyie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Balasubramanian, Karthik Babu Nilagiri
    Department of Mechanical Engineering, Assam Energy Institute, Centre of Rajiv Gandhi Institute of Petroleum Technology, 785697, Sivasagar, Assam, India.
    Shanmugam, Vigneshwaran
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Försth, Michael
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Hedenqvist, Mikael S
    Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Rantuch, Peter
    Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Jana Bottu 2781/25, 917 24 Trnava, Slovakia.
    Martinka, Jozef
    Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Jana Bottu 2781/25, 917 24 Trnava, Slovakia.
    Jiang, Lin
    School of Mechanical Engineering, Nanjing University of Science and Technology, 210094, Nanjing, China.
    Xu, Qiang
    School of Mechanical Engineering, Nanjing University of Science and Technology, 210094, Nanjing, China.
    Neisiany, Rasoul Esmaeely
    Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
    Lin, Chia-Feng
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.
    Mohanty, Amar
    School of Engineering, University of Guelph, Albert A. Thornbrough Building, 80 South Ring Road East, ON N1G 2W1, Guelph, Canada.
    Misra, Manjusri
    School of Engineering, University of Guelph, Albert A. Thornbrough Building, 80 South Ring Road East, ON N1G 2W1, Guelph, Canada.
    Functionalised biochar in biocomposites: The effect of fire retardants, bioplastics and processing methods2023Ingår i: Composites Part C: Open Access, E-ISSN 2666-6820, Vol. 11, artikel-id 100368Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Fire retardants, although can impart fire-safety in polymeric composites, are detrimental to the mechanical properties. Biochar can be used, in conjunction with fire retardants, to create a balance between fire-safety and mechanical performance. It is possible to thermally dope fire retardants into the pores of biochar to make it functionalised. Thus, the current work is intended in identifying a composite having the combination of the most desirable fire retardant, bioplastic, and a suitable processing method. A comparison was made between two fire retardants (lanosol and ammonium polyphosphate), bioplastics (wheat gluten and polyamide 11), and composite processing methods (compression and injection moulding). It was found that wheat gluten containing ammonium polyphosphate-doped biochar made by compression moulding had the best fire-safety properties with the lowest peak heat release rate (186 kW/m2), the highest fire performance index (0.6 m2s/kW), and the lowest fire growth index (1.6 kW/ms) with acceptable mechanical properties compared to the corresponding neat bioplastic. Thus, for gluten-based polymers, the use of ammonium polyphosphate thermally doped into biochar processed by compression moulding is recommended to both simultaneously improve fire-safety and conserve the mechanical strength of the resulting biocomposites.

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  • 27.
    Di Mauro, Alessandro
    et al.
    CNR-IMM, Via S. Sofia 64, 95123 Catania, Italy.
    Natile, Marta Maria
    Istituto di Chimica della Materia Condensata e Tecnologie per l’Energia, Consiglio Nazionale delle Ricerche (ICMATE-CNR) and Dipartimento di Scienze Chimiche, Università di Padova, Via F. Marzolo 1, 35131 Padova, Italy.
    Landström, Anton
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Concina, Isabella
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Ferroni, Matteo
    Department of Information Engineering, University of Brescia, Via Branze, Brescia, Italy. CNR-IMM, Via Gobetti, Bologna, Italy.
    Privitera, Vittorio
    CNR-IMM, Via S. Sofia 64, 95123 Catania, Italy.
    Impellizzeri, Giuliana
    CNR-IMM, Via S. Sofia 64, 95123 Catania, Italy.
    Epifani, Mauro
    CNR-IMM, Via Monteroni c/o Campus Universitario, 73100 Lecce, Italy.
    Visible Light Photodegradation of Dyes and Paracetamol by Direct Sensitization Mechanism onto Metallic MoO2 Nanocrystals2021Ingår i: Journal of Photochemistry and Photobiology A: Chemistry, ISSN 1010-6030, E-ISSN 1873-2666, Vol. 413, artikel-id 113258Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    MoO2 nanocrystals were prepared by solvothermal treatment of a Mo chloromethoxide at 250 °C in oleic acid. The monoclinic MoO2 phase, with a mean crystallite size of 29 nm, formed through reduction of molybdenum bronzes. The as-prepared MoO2 nanocrystals were free from organics, allowing their use in photodegradation tests of organic pollutants (methylene blue, rhodamine B, paracetamol), without any preliminary purification treatment of the nanocrystals. It was found that MoO2 was an efficient adsorbent of methylene blue (43 mg g-1 for 1.5 × 10−4 M concentration) in the dark and an efficient photodegradation catalyst under visible light (all methylene blue removed from the solution after 240 min). From the analysis of the combined photodegradation tests of rhodamine B and paracetamol, it was clarified that direct sensitization was responsible for photodegradation. This finding was related to the work function value of metallic MoO2, placed at more negative values if compared with other metallic materials.

  • 28.
    Ding, Junwei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
    Zheng, Huaiyang
    College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China.
    Ji, Xiaoyan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    One-step side-by-side 3D printing constructing linear full batteries2022Ingår i: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 58, nr 34, s. 5241-5244Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A one-step side-by-side 3D printing method is proposed to construct linear lithium-, sodium-, and zinc-ion full batteries with high electrochemical performance. The inks of the battery components present shear thinning characteristics and can be printed on different substrates. This approach to design high performance linear full batteries is a general strategy.

  • 29.
    Ding, Junwei
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
    Zheng, Huaiyang
    College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
    Wang, Shiwen
    College of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
    Ji, Xiaoyan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Hydrogenated borophene nanosheets based multifunctional quasi-solid-state electrolytes for lithium metal batteries2022Ingår i: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 615, s. 79-86Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Despite the fact that solid-state electrolytes have attracted broad research interests, the limited ion transfer and high interface impedance restrain their application in high-performance batteries with high cyclic stability and power density. Here, a new quasi-solid-state polymer electrolyte containing lightweight semiconducting hydrogenated borophene (HB) nanosheets, ionic liquids, and poly (ethylene oxide) is reported. The cyclic overpotential of the Li-Li symmetrical battery is about 65 mV lower than that of HB-free quasi-solid-state electrolyte, demonstrating the lower interface impedance. The interaction between lithium-ion and ethylene-oxide chains decreases owing to the existence of HB nanosheets and ionic liquids, which facilitates lithium-ion diffusion. The lithium bis(trifluoromethanesulfonyl)imide molecule surface adsorption at the HB nanosheets enhances the dissociation of lithium ions, and thus the matched lithium iron phosphate/Li full cell delivers the acceptable rate performance up to 5C. This work provides a new filler candidate to enhance the ionic conductivity of quasi-solid-state electrolytes that may facilitate to construct the high-performance HB nanosheets and ionic liquids-based lithium metal batteries.

  • 30.
    Edison, Thomas Nesakumar Jebakumar Immanuel
    et al.
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Atchudan, Raji
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Namachivayam, Karthik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Chandrasekaran, Pitchai
    Department of Chemistry, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, 624 302, Dindigul District, Tamil Nadu, India.
    Perumal, Suguna
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Arunachalam, Prabhakarn
    Electrochemical Sciences Research Chair (ESRC), Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
    Raja, Pandian Bothi
    School of Science and Engineering, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
    Gopalakrishnan Sethuraman, Mathur
    Department of Chemistry, The Gandhigram Rural Institute (Deemed to be University), Gandhigram, 624 302, Dindigul District, Tamil Nadu, India.
    Lee, Yong Rok
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Electrochemically exfoliated graphene sheets as electrode material for aqueous symmetric supercapacitors2021Ingår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 416, artikel-id 127150Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this work, we have demonstrated a prompt anodic electrochemical exfoliation of graphite into graphene sheets (GS) in aqueous media. For the synthesis of GS, a constant potential of +10 V has been applied between two identical graphite sheets in 0.1 M aqueous ammonium sulfate. The exfoliated GS were characterized via standard analytical tools such as Fourier transform infra red spectroscopy (FT-IR), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy with energy dispersive spectrum (FE-SEM with EDS). Further, the electrochemical performance of GS coated Ni foam (GS/Ni foam) was assessed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques in 2 M KOH. The quasi-rectangular shaped voltammograms and charge-discharge curves in a three-electrode system evidenced the double-layer capacitance of GS and GS/Ni foam which exhibited maximum specific capacitance of 84.8 and 40. 8 F/g at 2 mV/s, and 0.1 A/g of current density, respectively. Moreover, the symmetric two-electrode performance of GS/Ni foam was also examined, which showed good energy density (3.03 Wh/kg) and power density (562.5 W/kg). This study proves that the anodically exfoliated GS can act as a good symmetric supercapacitor in KOH.

  • 31.
    Edison, Thomas Nesakumar Jebakumar Immanuel
    et al.
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Atchudan, Raji
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Namachivayam, Karthik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Chandrasekaran, Sundaram
    Guangxi Key Laboratory of Electrochemical and Magneto-chemical, Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, PR China.
    Perumal, Suguna
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Raja, Pandian Bothi
    School of Chemical Sciences, Universiti Sains Malaysia, Gelugor, 11800 Pulau Pinang, Malaysia.
    Perumal, Veeradasan
    Centre of Innovative Nanostructures and Nanodevices (COINN), Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia. Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak Darul Ridzuan, Malaysia.
    Lee, Yong Rok
    School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
    Deep eutectic solvent assisted electrosynthesis of ruthenium nanoparticles on stainless steel mesh for electrocatalytic hydrogen evolution reaction2021Ingår i: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 297, artikel-id 120786Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Deep eutectic solvents (DES) are considered as a green non-toxic electrolyte for the replacement of cyanide based toxic electrolytes towards the electrodeposition of noble metal and alloy nanoparticles on conducting surfaces. In this work, ruthenium nanoparticles (RuNPs) are electrochemically synthesized over cathodically treated stainless-steel mesh (CSS) by applying the cathodic current of −15 mA/cm2 using ruthenium chloride and deep eutectic mixture consists of choline chloride/urea as electrolyte. The resulting material is abbreviated as RuNPs@CSS and are characterized by surface analytical tools such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning elctron microscopy with energy dispersive spectrum (FE-SEM with EDS). Further, the electrocatalytic hydrogen evolution reaction (HER) activity of RuNPs@CSS is accessed and compared with state of art Pt electrode using open circuit potential (OCP), linear sweep voltammetry (LSV), Tafel plot and electrochemical impedance spectroscopy (EIS) measurements in 0.5 M H2SO4. The calculated HER's onset potential and over potential @ −10 mA/cm2 of RuNPs@CSS are about −0.0273 and −0.0657 V vs. RHE, which are very close to the bare Pt values. The EIS results suggested that, RuNPs@CSS possess excellent conductivity, which decrease the charge transfer resistance and enhances the HER. This study proved that the electrodeposited RuNPs@SS is better replacement for Pt based electrocatalysts towards acidic HER.

  • 32.
    El Ouardi, Youssef
    et al.
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Lamsayah, Morad
    Laboratory of Applied and Environmental Chemistry (LCAE), Faculty of Science, University Mohammed First, 60 000, Oujda, Morocco.
    Butylina, Svetlana
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Geng, Shiyu
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Esmaeili, Mohammadamin
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Giove, Alessio
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland; Université de Toulon, MAPIEM, Toulon, France.
    Massima Mouele, Emile S.
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Virolainen, Sami
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    El Barkany, Soufian
    Laboratory of Molecular Chemistry, Materials and Environment (LMCME), Department of Chemistry, Faculty Multidisciplinary Nador, Mohamed 1st University, P. B. 300, Nador 62700, Morocco.
    Ouammou, Abdelkrim
    LIMOME Laboratory, Dhar El Mehraz Faculty of Sciences, Sidi Mohamed Ben Abdellah University, B.P. 1796, Atlas, Fes 30000, Morocco.
    Repo, Eveliina
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Laatikainen, Katri
    Lappeenranta-Lahti University of Technology LUT, School of Engineering Science, Department of Separation Science, Yliopistonkatu 34, FI-53850 Lappeenranta, Finland.
    Sustainable composite material based on glutenin biopolymeric-clay for efficient separation of rare earth elements2022Ingår i: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 440, artikel-id 135959Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Rare earth metals (REEs) are crucial for modern industries and technological development. Their extraction from non-renewable primary sources has almost reached its threshold due to excessive global demand. An effectual approach for REEs recovery is recycling secondary sources governed by separation materials. In this work, a novel glutenin-based Na-bentonite (Gle@Na_Bex:y) composite was produced via the in-situ hydrothermal route followed by a subsequent freeze-drying process. Additionally, a possible production route for the composites was proposed. The novel Gle@Na_Bex:y composites were characterized with Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET) surface area, and zeta potential (ZP) measurements. FTIR results complemented with SEM images and XRD measurements confirmed the successful incorporation of glutenin into the Na-bentonite clay. The separation of REEs from aqueous solution was used as a model system to demonstrate the material’s ability for selective metal recovery. The best conditions (T, pH, time) for REE sorption were assessed using equilibrium batch adsorption experiments. The kinetics of REE adsorption were effectively explained by a pseudo-second-order model; all the adsorption equilibrium data followed the Langmuir model. Thermodynamic investigations revealed that the adsorption is endothermic and spontaneous, and the adsorption of REEs occurred through a chemisorption process. The sorption mechanism of REE ions was investigated using molecular modelling. The results of this study demonstrate the feasibility of utilizing Gle@Na_Be50:50 composite as an efficient material for REEs removal. The maximum adsorption capacities of Y3+, La3+, and Nd3+ achieved with Gle@Na_Be50:50, were 76.87, 56.71, and 74.61 mg/g, respectively. This work offers a new route for engineering, valuable composite materials for the separation of REEs from diverse sources.

  • 33.
    Enrichi, Francesco
    et al.
    Department of Engineering for Innovation Medicine, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy; ISP-CNR Institute of Polar Sciences - National Research Council, Via Torino 155, 30172, Mestre-Venice, Italy.
    Mastantuoni, Gabriella
    Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology, and Health, KTH Royal Institute of Technology, AlbaNova University Centre, 106 91, Stockholm, Sweden.
    Cassetta, Michele
    Department of Engineering for Innovation Medicine, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy; Department of Industrial Engineering, University of Trento, 38122, Trento, Italy.
    Sambugaro, Alessia
    Department of Engineering for Innovation Medicine, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy.
    Daldosso, Nicola
    Department of Engineering for Innovation Medicine, University of Verona, Strada Le Grazie 15, 37134, Verona, Italy.
    Martucci, Alessandro
    Department of Industrial Engineering and INSTM, University of Padova, 35131, Padua, Italy.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172, Mestre-Venice, Italy.
    Cattaruzza, Elti
    Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Via Torino 155, 30172, Mestre-Venice, Italy.
    Righini, Giancarlo C.
    IFAC-CNR “Nello Carrara” Institute of Applied Physics – National Research Council, MiPLab, Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy.
    Structural and optical properties of Eu3+-doped sol–gel silica–soda glasses2024Ingår i: The European Physical Journal Plus, E-ISSN 2190-5444, Vol. 139, nr 4, artikel-id 346Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Rare earths (REs) incorporated in glasses, mostly in the form of RE3+ ions, have several applications such as lasers and optical amplifiers, spectral conversion layers for solar cells, light emitters and sensors. In this context, both the composition and the structural properties of the glass, as well as the dopant concentration play an important role in determining the optical properties and the efficiency of the system. Usually, the concentration of REs is small, below 1 at%, to avoid clustering and optical quenching. In this paper, we report the case of sol–gel Eu-doped silica–soda glass films. The addition of soda to silica can reduce RE clustering and precipitation, according to molecular dynamic simulations, but brings structural instabilities to the network. Here, sodium was varied from 10 to 30 at% and Eu from 0 to 8 at%. It was shown that Eu plays a significant role in the stabilization of the matrix, improving the transparency, the refractive index and the thickness of the films. The increase of Eu concentration provides a decrease of site symmetry and an increase of quantum efficiency (QY), reaching 71% for the highest 8 at% Eu doping, with remarkable absence of concentration quenching.

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  • 34.
    Escamilla-Roa, Elizabeth
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik.
    Cartwright, Julyan H. E.
    Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Armilla Granada, Spain. Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Granada, Spain.
    Sainz-Díaz, C. Ignacio
    Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Armilla Granada, Spain.
    Chemobrionic Fabrication of Hierarchical Self‐Assembling Nanostructures of Copper Oxide and Hydroxide2019Ingår i: ChemSystemsChem, E-ISSN 2570-4206, Vol. 1, nr 3, artikel-id e1900011Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Copper oxide nanostructures have great potential use in a plethora of nanotechnology applications including nanoelectronics, photovoltaics, sensors, electrochemistry, and pharmacology. In the present work we show how hierarchically nano‐structured copper oxide and hydroxide may be prepared through self‐assembly from CuSO4 salt and silicate solutions using the chemobrionic growth process of a chemical garden. Procedures were explored using the cupric salt in either solid (pellet and seed growth methods) or liquid phase (fluid injection techniques). Self‐assembling nanostructures were characterized by means of environmental scanning electron microscopy (ESEM) with energy‐dispersive X‐ray spectroscopy (EDX) analysis, micro‐Raman spectroscopy and X‐ray diffraction. Our results show the formation of crystalline aggregates of copper oxide and hydroxide in complex hierarchical nanostructured forms including fans, flowers, petals, skeins, lentils, and sheaves. Analytical methods corroborate that these nanostructures may be selected in shape and chemical composition with the reaction conditions.

  • 35.
    Escamilla-Roa, Elizabeth
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik. Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.; International Research Centre in Critical Raw Materials-ICCRAM, Universidad de Burgos, Burgos, Spain.
    Zorzano, María-Paz
    Department of Planetology and Habitability, Centro de Astrobiología (CAB), CSIC-INTA, Torrejón de Ardoz, Madrid, Spain.
    Martin-Torres, Javier
    Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain; School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom.
    Sainz-Díaz, Claro Ignacio
    Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.
    Cartwright, Julyan H.E.
    Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain; Instituto Carlos I de Física Teórica y Computacional, Universidad de Granada, Granada, Spain.
    Self-Assembled Structures Formed in CO2-Enriched Atmospheres: A Case-Study for Martian Biomimetic Forms2022Ingår i: Astrobiology, ISSN 1531-1074, E-ISSN 1557-8070, Vol. 22, nr 7, s. 863-879Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of this study was to investigate the biomimetic precipitation processes that follow the chemical-garden reaction of brines of CaCl2 and sulfate salts with silicate in alkaline conditions under a Mars-type CO2-rich atmosphere. We characterize the precipitates with Environmental Scanning Electron Microscope micrography, micro-Raman spectroscopy, and X-ray diffractometry. Our analysis results indicate that self-assembled carbonate structures formed with calcium chloride can have vesicular and filamentary features. With magnesium sulfate as a reactant a tentative assignment with Raman spectroscopy indicates the presence of natroxalate in the precipitate. These morphologies and compounds appear through rapid sequestration of atmospheric CO2 by alkaline solutions of silica and salts.

  • 36.
    Escamilla-Roa, Elizabeth
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik. Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.
    Zorzano Mier, María-Paz
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik. Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, Madrid, Spain.
    Martin-Torres, Javier
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik. Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.
    Hernández-Laguna, Alfonso
    Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.
    Saínz-Díaz, C.Ignacio
    Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain.
    DFT study of the reduction reaction of calcium perchlorate on olivine surface: Implications to formation of Martian’s regolith2020Ingår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 512, artikel-id 145634Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Perchlorates have been found widespread on the surface of Mars, their origin and degradation pathways are not understood to date yet. We investigate here, from a theoretical point of view, the potential redox processes that take place in the interaction of Martian minerals such as olivine, with anhydrous and hydrated perchlorates. For this theoretical study, we take as mineral substrate the (1 0 0) surface of forsterite and calcium perchlorate salt as adsorbate. Our DFT calculations suggests a reduction pathway to chlorate and chlorite. When the perchlorate has more than 4 water molecules, this mechanism, which does not require high-temperature or high energy sources, results in parallel with the oxidation of the mineral surface, forming magnesium peroxide, MgO2, and in the formation of ClO3, which through photolysis is known to form ClO-O2. Because of the high UV irradiance that reaches the surface of Mars, this may be a source of O2 on Mars. Our results suggest that this process may be a natural removal pathway for perchlorates from the Martian regolith, which in the presence of atmospheric water for salt hydration, can furthermore lead to the production of oxygen. This mechanism may thus have implications on the present and future habitability of the Martian surface.

  • 37.
    Fedina, Tatiana
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Belelli, Filippo
    Politecnico di Milano, Department of Mechanical Engineering, Via G. La Masa 1, 20156, Milano, Italy.
    Lupi, Giorgia
    Politecnico di Milano, Department of Mechanical Engineering, Via G. La Masa 1, 20156, Milano, Italy.
    Brandau, Benedikt
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. Jenoptik Optical Systems GmbH, Göschwitzersrasse 25, 07745 Jena, Germany.
    Casati, Riccardo
    Politecnico di Milano, Department of Mechanical Engineering, Via G. La Masa 1, 20156, Milano, Italy.
    Berneth, Raphael
    Fraunhofer IWS, Winterbergstrasse 28, 01277, Dresden, Germany.
    Brueckner, Frank
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling. Fraunhofer IWS, Winterbergstrasse 28, 01277, Dresden, Germany.
    Kaplan, Alexander F.H.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Influence of AlSi10Mg powder aging on the material degradation and its processing in laser powder bed fusion2022Ingår i: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 412, artikel-id 118024Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigates the impact of powder aging on the degradation of AlSi10Mg powder during processing in laser powder bed fusion. Powder aging as result of handling, continuous storage and recycling is a fundamental concern for aluminum alloys as it introduces oxygen to the feedstock material. In this work, the analysis of the powder properties, affected by laser exposure and the aging procedure, showed a change of chemical and morphological characteristics of the powders in virgin and aged conditions. The oxygen content in the powders appeared to have a significant effect on the powders' surface appearance and light absorbance, gradually deteriorating the processability of the powders with the increase of oxygen level. Optical microscopy and X-ray computed tomography were used to analyze the porosity distribution in the printed part samples, identifying the origin, size and location of the pores. A direct relationship between the pore occurrence in final parts and the oxygen content in the powders was observed, revealing a higher degree of porosity in the aged powder sample (6.5%) in comparison with the virgin state (3.16%). The evolution of mechanical properties in the part samples after laser processing and powder aging was also studied, demonstrating a rapid decrease of ultimate tensile strength and elongation from virgin condition to aged.

  • 38.
    Feltrin, Ana Carolina
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    High-temperature oxidation kinetics of a metastable dual-phase diboride and a high-entropy diboride2023Ingår i: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 43, nr 16, s. 7363-7372Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The processing of multicomponent (Ti0.25V0.25Zr0.25Hf0.25)B2 ultra-high temperature hexagonal transition metal diboride in dual-phase and single-phase microstructures and investigation of oxidation behavior in the air at 1000 and 1500 °C are reported. The dual-phase diboride is a metastable phase composed of Hf-Zr-rich and Ti-V-rich phases that undergo phase transformation to a single-phase high-entropy diboride after thermal annealing. At 1000 °C, a B2O3 layer was formed on the material's surface, and the oxidation kinetics followed a para-linear behavior. At 1500 °C, a porous oxide layer was formed, facilitating oxygen diffusion and reaction with the diboride, resulting in linear oxidation kinetics. The prediction of the lifetime of the materials during high-temperature oxidation suggested that the high-entropy material outperforms the dual-phase diboride, making it most suitable for related applications. The superior performance of the high-entropy single-phase diboride was associated with the high-entropy and sluggish diffusion effects.

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  • 39.
    Feltrin, Ana Carolina
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Hedman, Daniel
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea.
    Akhtar, Farid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Transformation of metastable dual-phase (Ti0.25V0.25Zr0.25Hf0.25)B2 to stable high-entropy single-phase boride by thermal annealing2021Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 119, nr 16, artikel-id 161905Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Transition metal borides have a unique combination of high melting point and high chemical stability and are suitable for high temperature applications (>2000 °C). A metastable dual-phase boride (Ti0.25V0.25Zr0.25Hf0.25)B2 with distinct two hexagonal phases and with an intermediate entropy formation ability of 87.9 (eV/atom)−1 as calculated via the density functional theory (DFT) was consolidated by pulsed current sintering. Thermal annealing of the sintered dual-phase boride at 1500 °C promoted the diffusion of metallic elements between the two boride phases leading to chemical homogenization and resulted in the stabilization of a single-phase high-entropy boride. Scanning electron microscopy, in situ high temperature x-ray diffraction, and simultaneous thermal analysis of the as-sintered and annealed high-entropy borides showed the homogenization of a dual-phase to a single-phase. The experimentally obtained single-phase structure was verified by DFT calculations using special quasirandom structures, which were further used for theoretical investigations of lattice distortions and mechanical properties. Experimentally measured mechanical properties of the single-phase boride showed improved mechanical properties with a hardness of 33.2 ± 2.1 GPa, an elastic modulus of 466.0 ± 5.9 GPa, and a fracture toughness of 4.1 ± 0.6 MPa m1/2.

  • 40.
    Foorginezhad, S.
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Zerafat, M. M.
    Faculty of Advanced Technologies, Nano-Chemical Engineering Department, Shiraz University, Shiraz, 71348-51154, Iran.
    Asadnia, M.
    School of Engineering, Macquarie University, Sydney, New South Wales, 2109, Australia.
    Rezvannasab, Gh
    Faculty of Advanced Technologies, Nano-Chemical Engineering Department, Shiraz University, Shiraz, 71348-51154, Iran.
    Activated porous carbon derived from sawdust for CO2 capture2024Ingår i: Materials Chemistry and Physics, ISSN 0254-0584, E-ISSN 1879-3312, Vol. 317, artikel-id 129177Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Mitigation of greenhouse gas emissions, especially CO2, highlights the critical demand for efficient CO2 capture technologies. This is due to their essential role in climate change and their profound impact on global ecosystems and human well-being. Activated carbons have emerged as promising candidates for CO2 capture due to their availability, cost-effectiveness, and tunable properties. In this study, activated carbons were synthesized from sawdust carbonized at various temperatures within the 700–1100 °C range and subsequently activated using CO2. Comprehensive characterization was conducted through SEM, FESEM, XRD, TGA, and FTIR techniques to assess the properties. The results reveal that carbonization at 1000 °C yielded an activated carbon with a hierarchical and microporous structure, featuring surface area, pore volume, and pore size of 1651.34 m2/g, 0.69 cm³/g, and <1.76 nm, respectively. Remarkably, this activated carbon exhibited promising CO2 uptake of 9.2 mmol/g at 25 °C and 1 bar. Moreover, a remarkable recyclability over 10 cycles demonstrates its potential for practical CO2 capture applications. Furthermore, the synthesized activated carbon exhibited high selectivity for CO2 over N2 (85/15 v/v), reaching 40.2 at 1 bar and 25 °C. These findings underscore the viability of the as-prepared activated carbon as a desired candidate for efficient and selective CO2 capture, contributing to the ongoing efforts to mitigate the impact of anthropogenic CO2 emissions to the environment.

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  • 41.
    Foroutan, Masumeh
    et al.
    Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran 1455-6455, Iran.
    Fadaei Naeini, Vahid
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Alibalazadeh, Mahtab
    Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran 1455-6455, Iran.
    Unraveling Flow Separation at the Water–Carbon Nanotube Interface: An Atomic-Scale Overview by Molecular Dynamics Simulation2022Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 38, nr 14, s. 4256-4265Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Flow separation near the fluid–solid surface has attracted attention for decades. It is critical to understand the behavior of separated flow adjacent to the solid walls to broaden its range of potential applications. Therefore, we conducted molecular dynamics investigations to consider water flow separation at the water–carbon nanotube (CNT) interface for different diameters of CNTs between 13 and 50 Å and different pressures of 0.1–1.254 GPa. Density heat maps indicated that water flow separation is observed for all CNTs under high pressures, and an empty space of water molecules or evacuation is formed behind the CNTs. It is shown that in CNTs with small diameters, (10, 10) and (20, 20), the structure of the first layer (FL) of water molecules or hydrated layer adjacent to the CNT wall is completely preserved, indicating that evacuation occurs from behind the CNTs. In (30, 30) and (40, 40) CNTs, flow separation occurred from the FL of water molecules near the solid surface, and the layered structure of water around CNTs is completely destroyed. Our findings of fluid–solid and fluid–fluid interaction energies suggested that the flow separation can be due to an attraction between the FL of water molecules and CNT and a repulsion between the water molecules in the hydrated layer and the outer layers. Moreover, analyzing the relationship between the CNT size and flow separation revealed that in the case of small CNTs, there are extra water molecules that contribute to the structural stability of the hydrated layer by strengthening the repulsive interaction in the liquid–liquid surface.

  • 42.
    Garskaite, Edita
    et al.
    Division of Building Materials, Lund University, John Ericssons väg 1, Lund, Sweden.
    Bollen, Math
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Mulenga, Enock
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
    Warlo, Mathis
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
    Bark, Glenn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.
    Olsen, Espen
    Department of Physics, Faculty of Science and Technology, Norwegian University of Life Sciences (NMBU), Drøbakveien 31, 1430 Ås, Norway.
    Brazinskiene, Dalia
    Center for Physical Sciences and Technology, Sauletekio 3, Vilnius, Lithuania.
    Sokol, Denis
    Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius LT-03225, Lithuania.
    Buck, Dietrich
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.
    Sandberg, Dick
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.
    Assessing aspects of solution-based chemical synthesis to convert waste Si solar cells into nanostructured aluminosilicate crystals2024Ingår i: CrystEngComm, E-ISSN 1466-8033, Vol. 26, nr 17, s. 2221-2334Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The end-of-life recycling of crystalline silicon photovoltaic (PV) modules and the utilisation of waste is of fundamental importance to future circular-economy societies. In the present work, the wet-chemistry synthesis route – a low-temperature dissolution–precipitation process – was explored to produce aluminosilicate minerals from waste c-Si solar cells. Nanostructured crystals were produced in an alkaline medium by increasing the reaction temperature from room temperature to 75 °C. The morphology of the produced crystals varied from nanolayered aggregates to rod-shaped crystals and was found to be dependent on the temperature of the reaction medium. Chemical and phase composition studies revealed that the synthesised compounds consisted of structurally different phases of aluminosilicate minerals. The purity and elemental composition of produced crystals were evaluated by energy dispersive spectroscopy (EDS) and micro X-ray fluorescence (μXRF) analysis, confirming the presence of Al, O, and Si elements. These results give new insights into the processing of aluminosilicate minerals with sustainable attributes and provide a possible route to reducing waste and strengthening the circular economy.

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  • 43.
    Geng, Shiyu
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Maennlein, Alexis
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Yu, Liang
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Hedlund, Jonas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Oksman, Kristiina
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Mechanical & Industrial Engineering (MIE), University of Toronto, Toronto, ON, M5S 3G8, Canada.
    Monolithic carbon aerogels from bioresources and their application for CO2 adsorption2021Ingår i: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 323, artikel-id 111236Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Monolithic binder-free CO2 adsorbents with high adsorption capacity, selectivity, adsorption-desorption kinetics, and regenerability are highly desired to both reduce the environmental impact of anthropogenic CO2 emissions and purify valuable gases from CO2. Herein, we report a strategy to prepare monolithic carbonaceous CO2 adsorbents from low-cost and underutilized bioresources, which enabled the formation of a delicate anisotropic, hierarchical porous structure. With optimized material composition and processing conditions, the biobased carbon adsorbent demonstrated a CO2 adsorption capacity of 4.49 mmol g-1 at 298 K and 100 kPa, relatively weak adsorbent-adsorbate affinity, good CO2/N2 selectivity, and advantageous hydrophobicity against water vapor. Moreover, the unique anisotropic porous structure provided high stiffness and good flexibility to the adsorbent in the axial and radial directions, respectively. We confirmed that this type of carbon adsorbent could be packed in a column for dynamic CO2 capture independent of any binders, indicating its promising future for further development toward widespread utilization.

  • 44.
    Gergely, Andras
    et al.
    Department of Physical Chemistry, Institute of Chemistry, University of Pannonia, Egyetem u. 10., Veszprém, 8200, Hungary.
    Szabó, Péter
    Department of General and Inorganic Chemistry, Institute of Chemistry, University of Pannonia, Egyetem u. 10., Veszprém, 8200, Hungary.
    Krojer, Antal
    Department of Inspection and Maintenance, Mol Nyrt., Olajmunkás u. 2., Százhalombatta, 2443, Hungary.
    Nagy, Bence
    Refining Research and Innovation, Mol Nyrt., Olajmunkás u. 2., Százhalombatta, 2443, Hungary.
    Kristof, Tamas
    Department of Physical Chemistry, Institute of Chemistry, University of Pannonia, Egyetem u. 10., Veszprém, 8200, Hungary.
    Hydrogen Sulfide Corrosion of Carbon and Stainless Steel Alloys in Mixtures of Renewable Fuel Sources under Co-Processing Conditions2018Ingår i: Modern Applied Science, ISSN 1913-1844, E-ISSN 1913-1852, Vol. 12, nr 4, s. 227-255Artikel i tidskrift (Refereegranskat)
  • 45.
    Gezahegn, S.
    et al.
    Centre for Biocomposites and Biomaterials Processing, Faculty of Forestry, University of Toronto, Toronto, Ontario, M5S 3B3, Canada.
    Wei, Jiayuan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Oksman, Kristiina
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario, M5S 3G8, Canada.
    Sain, Mohini
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Centre for Biocomposites and Biomaterials Processing, Faculty of Forestry, University of Toronto, Toronto, Ontario, M5S 3B3, Canada; Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario, M5S 3G8, Canada.
    Lignin Spinning and Carbonization to Nano-Layered Graphitic Structure2019Ingår i: Proceedings of the 2019 International Conference on Composite Materials: Melbourne, Australia, August 11-16, 2019 / [ed] Adrian Mouritz; Chun Wang; Bronwyn Fox, RMIT University , 2019, s. 1482-1488, artikel-id 110Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Graphitic lignin-based nanocarbons were prepared from spun lignin/PVA nanofiber networks using dry pyrolysis (DP) at 900 oC and hydrothermal carbonization (HTC) at 200 oC under a pressure of ~200 psi. The graphite formations were confirmed in both DP and HTC treated samples using Transmission Electron Microscopy (TEM). The electrical conductivity of DP treated samples was improved by 14 % compared to the HTC treated samples, showing that DP converts lignin into more conductive graphite components. The photoluminescence of both charring methods showed similar patterns, with the highest emission at 320 nm. The DP samples had two times higher intensity than the HTC samples and were red-shifted, while the HTC samples showed more broad peaks. Corroborating with Fourier-Transform Infrared Spectroscopy (FTIR) results, functional groups from lignin residue were present in the HTC samples, while they were attenuated in the DP samples. The most important finding of this study is that spun Lignoboost lignin/PVA fibers prepared via two different charring methods yield layered graphitic materials.

  • 46.
    Ghomi, Erfan Rezvani
    et al.
    Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, National University of Singapore, Singapore 117581, Singapore.
    Khorasani, Saied Nouri
    Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
    Koochaki, Mohammad Sadegh
    Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Research and Development Department, Alvan Paint & Resin Production Co., Tehran, 13991-53611, Iran.
    Dinari, Mohammad
    Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
    Ataei, Shahla
    Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
    Enayati, Mohammad Hossein
    Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
    Das, Oisik
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Neisiany, Rasoul Esmaeely
    Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran.
    Synthesis of TiO2 nanogel composite for highly efficient self-healing epoxy coating2023Ingår i: Journal of Advanced Research, ISSN 2090-1232, Vol. 43, s. 137-146Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Introduction

    Organic coatings are the most effective and facile methods of protecting steel against corrosion, which shields it from direct contact with oxygen and moisture. However, they are inherently defective and susceptible to damage, which allows the penetration of the corrosive media into the underlying substrates. Self-healing coatings were developed to address this shortcoming.

    Objective

    The current research aims to develop a coating with superior self-healing ability via embedment of titanium dioxide (TiO2) nanogel composite (NC) in a commercial epoxy.

    Methods

    The TiO2 NC was prepared by efficient dispersion of TiO2 nanoparticles in copolymer gel of acrylamide (AAm) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) with the help of 3-(trimethoxysilyl) propyl methacrylate (MPS). The chemical structure, morphology, and thermal properties of the modified and functionalized nanoparticles were assessed by infrared spectroscopy, electron microscopy, X-ray diffraction, and thermogravimetric analysis, respectively. In addition, TiO2 nanoparticles, nano-TiO2 functionalized monomer (NTFM), and NTFM/AAm/AMPS in different weight percentages were incorporated into epoxy resin to prepare a self-healing coating.

    Results

    The results confirmed the successful fabrication of the NC. In addition, the incorporation of 1 wt% NTFM/AAm/AMPS led to homogenous dispersion, enhanced anti-corrosive and self-healing performance with the healing efficiencies of 100% and 98%, which were determined by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods, respectively.

    Conclusion

    The prepared NC was sensitive towards salt concentration, pH, which aids the quick reaction of the TiO2 NC to corrosive ions, once the cracks occur. In addition, this is a unique feature compared to the other self-healing mechanisms, especially, the encapsulation of healing agents, which can be effective as long as the healing agent is present.

  • 47.
    Ghosh, Amar
    et al.
    Department of Chemistry, Behala College, Kolkata-700060, West Bengal, India; Department of Chemistry, Jadavpur University, Kolkata-700032, West Bengal, India.
    Kumar De, Sandip
    Nanophotonics Group, Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata-700064, West Bengal, India.
    Mondal, Subrata
    Nanophotonics Group, Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata-700064, West Bengal, India.
    Halder, Animesh
    Department of Physics, Jadavpur University, Kolkata-700032, West Bengal, India.
    Barai, Manas
    Department of Chemistry, Vidyasagar University, Midnapore-721102, West Bengal, India.
    Chandra Guchhait, Kartik
    Department of Human Physiology, Vidyasagar University, Midnapore-721102, West Bengal, India.
    Raul, Priyanka
    Department of Human Physiology, Vidyasagar University, Midnapore-721102, West Bengal, India.
    Karmakar, Sanat
    Department of Physics, Jadavpur University, Kolkata-700032, West Bengal, India.
    Ghosh, Chandradipa
    Department of Human Physiology, Vidyasagar University, Midnapore-721102, West Bengal, India.
    Patra, Anuttam
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.
    Kumar Panda, Amiya
    Department of Chemistry, Vidyasagar University, Midnapore-721102, West Bengal, India.
    Senapati, Dulal
    Nanophotonics Group, Chemical Sciences Division, Saha Institute of Nuclear Physics, Kolkata-700064, West Bengal, India.
    Kumar Sur, Ujjal
    Department of Chemistry, Behala College, Kolkata-700060, West Bengal, India.
    Green synthesis of silver nanoparticles and its applications as sensor, catalyst, and antibacterial agent2023Ingår i: Materials Today: Proceedings, E-ISSN 2214-7853Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have reported for the first time a solvated electron mediated reduction of silver ion (Ag+) in presence of extract of Murraya koenigii (Mk) leaf as a surfactant to produce silver nanoparticles (AgNPs). Synthesized NPs show efficient ascorbic acid sensing at the µM range along with selective detection of different metal ions due to the presence of different biomolecules on the surface which are present in the extract. Synthesized nontoxic AgNPs will also exhibit proficient photocatalytic behavior for the degradation of toxic dyes due to the effective coupling between surface plasmon of AgNPs and the excited state continuum of the dye fluorophores. AgNPs will also exhibit substantial antibacterial activities. Altogether, our biosynthesized nontoxic NPs could be effectively used as both chemical and biosensor, catalyst as well as antibacterial agent.

  • 48.
    Gnezdilov, Oleg I.
    et al.
    Institute of Physics, Kazan Federal University, 420008 Kazan, Russia.
    Filippov, Andrei
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik. Medical and Biological Physics, Kazan Medical University, 420012, Kazan, Russia.
    Khan, Inayat Ali
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Shah, Faiz Ullah
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Translational and reorientational dynamics of ionic liquid-based fluorine-free lithium-ion battery electrolytes2022Ingår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 345, artikel-id 117001Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The translational as well as reorientational mobilities of fluorine-free electrolytes prepared by mixing lithium furan-2-carboxylate Li(FuA) salt with tetra(n-butyl)phosphonium furan-2-carboxylate (P4444)(FuA) ionic liquid are thoroughly investigated. The diffusivity of ions and T1 relaxation of protons belonging to various chemical groups of (P4444)+ and (FuA) ions and the Li+ ion present in these electrolytes are measured as a function of lithium salt concentration and temperature. The temperature dependence of correlation time for reorientational mobility of various chemical groups of (P4444)+ and (FuA) ions and the Li+ ion are estimated and used in calculations temperature dependence of the corresponding reorientational rates. It is shown that an increase in the concentration of lithium salt leads to a decrease in both the diffusion coefficients and the reorientation rates for all the chemical groups in concerted way. Activation energy of the reorientational rates for different chemical groups of the organic ions and the Li+ are discussed in details.

  • 49.
    Gong, Jie
    et al.
    College of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu, PR China.
    Tong, Fei
    College of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu, PR China.
    Zhang, Chunyong
    College of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, Jiangsu, PR China.
    Nobandegani, Mojtaba Sinaei
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Yu, Liang
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
    Zhang, Lixiong
    State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing, 210009, PR China.
    Bacterial cellulose assisted synthesis of hierarchical pompon-like SAPO-34 for CO2 adsorption2022Ingår i: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 331, artikel-id 111664Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In the present work, a biosynthesis route for the preparation of hierarchical pompon-like SAPO-34 was developed. Commercially available bacterial cellulose aerogel was used as template. SiO2 loaded bacterial cellulose aerogel was used as silica source and a simple hydrothermal treatment was used for crystallization. XRD, FT-IR, SEM, TEM, N2 adsorption-desorption and TG techniques were employed to characterize the obtained samples. The hierarchical pompon-like SAPO-34 showed a spherical morphology that was comprised of nanosheets with a thickness less than 30 nm. The specific surface area of the hierarchical pompon-like SAPO-34 was 498 m2/g that was higher than the trigonal SAPO-34 crystals of 465 m2/g. The ultrasonic treatment experiment indicated a high stability of the pompon-like structure. In addition, the hierarchical pompon-like SAPO-34 exhibited a CO2 adsorption capacity of 2.26 mmol/g at 100 kPa and 298K and the corresponding CO2/CH4 ideal separation factor was 5.7, which was higher than that of trigonal SAPO-34 crystals. The saturated adsorption capacity and b-value were estimated using single site Langmuir, Toth and Sips adsorption isotherm models and the observed results were constant. Compared with trigonal SAPO-34, hierarchical pompon-like SAPO-34 displayed a higher saturated adsorption capacity, but a lower b-value.

  • 50.
    Gong, Xiao
    et al.
    State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
    Jiang, Hang
    State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
    Cao, Mengyan
    State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
    Rao, Zhihui
    State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
    Zhao, Xiujian
    State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
    Vomiero, Alberto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap. Department of Molecular Sciences and Nano Systems, Ca' Foscari University of Venice Via Torino 155, 30172 Venezia Mestre, Italy.
    Eu-doped ZnO quantum dots with solid-state fluorescence and dual emission for high-performance luminescent solar concentrators2021Ingår i: Materials Chemistry Frontiers, E-ISSN 2052-1537, Vol. 5, nr 12, s. 4746-4755Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Heavy-metal-free quantum dots (QDs) are promising luminophores for luminescent solar concentrators (LSCs) because of environmental friendliness, which is essential for industrial applications. In order to keep high optical quality and inhibit aggregation-induced quenching, usually QDs can only be loaded at low concentration in a polymer optical waveguide material for LSCs, which significantly impairs the power conversion efficiency (PCE). Thus, it is a challenge to fabricate high-performance LSCs with high QD loading. Here, dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are synthesized via a simple sol–gel method, which enables two characteristic photoluminescence peaks at 551 nm and 614 nm. Furthermore, Eu-doped ZnO QDs with dual fluorescence emission are for the first time reported to be applied in LSCs. The performance of LSCs can be influenced by the loading concentration of Eu-doped ZnO QDs in polyvinyl pyrrolidone (PVP) films. The obtained external optical efficiency (ηopt) of the LSCs based on Eu-doped ZnO QDs can be relatively high (4.37%) compared to the reported LSCs with a similar area when the loading concentration of Eu-doped ZnO QDs is up to 13.2% because of both their high photoluminescence intensity and dual fluorescence emission. Our results demonstrate that dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are promising candidates as luminophores for LSCs.

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