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Li, W., Wang, X., Lin, J., Meng, X., Wang, L., Wang, M., . . . Zhao, H. (2024). Controllable and large-scale synthesis of carbon quantum dots for efficient solid-state optical devices. Nano Energy, 122, Article ID 109289.
Open this publication in new window or tab >>Controllable and large-scale synthesis of carbon quantum dots for efficient solid-state optical devices
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2024 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 122, article id 109289Article in journal (Refereed) Published
Abstract [en]

Carbon quantum dots (C-dots) showed excellent structure-tunable optical properties, mainly composed of carbon, nitrogen and oxygen. They have been used for various types of solid-state optical devices. Due to the photoluminescence quenching caused by aggregation, it is a challenge to produce high quantum yield and large Stokes shift C-dots via controllable and simple approaches. In this work, we demonstrated a microwave assisted heating approach for the high-quality C-dots production with ten grams scale per batch in less than 4 min. The addition of metal cation promoted the formation of the foam-structure by forming carboxyl-metal-amine complex, enabling the spatial confined growth of the C-dots in a solid-state, contributing to the high quantum yield (QY) of 73% with a Stokes shift of 0.65 eV. By tuning the structure of the C-dots, excitation dependent and independent photoluminescent (PL) behavior were achieved because of the formation of the different types of energy states evidenced by transient PL and femtosecond transient absorption spectroscopy. These optical properties enable the C-dots to be successfully integrated in luminescent solar concentrators (LSCs), having an external optical efficiency of 3.0% and a power conversion efficiency of 1.3% (225 cm2) and an excitation-dependent high-level anticounterfeiting fluorescent code, showing a great potential for solid-state optical system.

Place, publisher, year, edition, pages
Elsevier Ltd, 2024
Keywords
Anti-counterfeiting, Carbon quantum dots, Foam structure, Luminescent solar concentrators, Microwave reaction
National Category
Other Materials Engineering
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-104317 (URN)10.1016/j.nanoen.2024.109289 (DOI)2-s2.0-85184146951 (Scopus ID)
Funder
The Kempe FoundationsWallenberg FoundationsSwedish Research Council, 2022–05024
Note

Validerad;2024;Nivå 2;2024-02-20 (joosat);

Funder: Shandong Natural Science Funds (ZR2022EQ036); Shandong Natural Science Funds for Distinguished Young Scholar (ZR2020JQ20); Italian MUR under PNRR NEST program

Full text license: CC BY

Available from: 2024-02-20 Created: 2024-02-20 Last updated: 2024-02-20Bibliographically approved
Xia, L., Tong, X., Yao, Y., Long, Z., Cai, M., Jin, L., . . . Wang, Z. M. (2024). Simultaneous copper incorporation in core/shell-structured eco-friendly quantum dots for high-efficiency photoelectrochemical hydrogen evolution. Nano Energy, 122, Article ID 109302.
Open this publication in new window or tab >>Simultaneous copper incorporation in core/shell-structured eco-friendly quantum dots for high-efficiency photoelectrochemical hydrogen evolution
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2024 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 122, article id 109302Article in journal (Refereed) Published
Abstract [en]

The rational design of elemental incorporation in colloidal eco-friendly core/shell quantum dots (QDs) holds the potential to synergistically tailor their electronic band structure and carrier kinetics for applications in forthcoming “green” and high-efficiency solar energy conversion. Herein, we have conducted simultaneous Cu incorporation in both the core and shell regions of environment-benign AgInSe (AISe)/ZnSe core/shell QDs to realize high-efficiency solar-driven photoelectrochemical (PEC) hydrogen evolution. It is verified that Cu incorporation in AISe core enables an upward shift in the position of the band edge relative to the ZnSe shell, which promoted the electron delocalization and extended the lifetime of exciton. Simultaneously, Cu incorporation in the ZnSe shell further results in the trapping of photoinduced holes from AISe core, leading to a decelerated recombination of carriers. The prepared Cu-AISe/ZnSe:Cu QDs with optimized optoelectronic properties have been successfully employed to fabricate QDs-PEC devices, delivering a maximum photocurrent density of 9.1 mA cm−2 under standard AM 1.5 G illumination (100 mW cm−2). Our findings indicate that synchronous elemental incorporation in eco-friendly core/shell QDs is a promising strategy to achieve future high-performance solar-to-hydrogen conversion systems.

Place, publisher, year, edition, pages
Elsevier Ltd, 2024
Keywords
Colloidal quantum dots, Core/shell system, Environment-friendly, Simultaneous copper incorporation, Solar hydrogen evolution
National Category
Condensed Matter Physics Physical Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-104169 (URN)10.1016/j.nanoen.2024.109302 (DOI)2-s2.0-85183459187 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg FoundationLuleå University of TechnologyThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)
Note

Validerad;2024;Nivå 2;2024-02-05 (joosat);

Funder: Sichuan Science and Technology Program (2021YFH0054, 2023JDGD0011); National Natural Science Foundation of China (22105031); National Key Research and Development Program of China (2019YFE0121600); Fundamental Research Funds for the Central Universities (2019YFB2203400, ZYGX2020J028); 111 Project (B20030); H2020 Framework program through PNRR iNEST and NEST projects; Ca’ Foscari University of Venice;

Full text license: CC BY

Available from: 2024-02-05 Created: 2024-02-05 Last updated: 2024-02-05Bibliographically approved
Kou, C., Zhou, J., Wang, H., Han, J., Han, M., Vomiero, A., . . . Liang, H. (2023). Boron pretreatment promotes phosphorization of FeNi catalysts for oxygen evolution. Applied Catalysis B: Environmental, 330, Article ID 122598.
Open this publication in new window or tab >>Boron pretreatment promotes phosphorization of FeNi catalysts for oxygen evolution
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2023 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 330, article id 122598Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2023
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-96374 (URN)10.1016/j.apcatb.2023.122598 (DOI)2-s2.0-85150779578 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg Foundation
Note

Validerad;2023;Nivå 2;2023-04-12 (hanlid);

Funder: National Natural Science Foundationof China, NSFC (51771132, 52204320); ÅFORSK Foundation

Available from: 2023-04-12 Created: 2023-04-12 Last updated: 2023-04-12Bibliographically approved
Pankratova, D., Giacomelli, S. M., Yusupov, K., Akhtar, F. & Vomiero, A. (2023). Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy. ACS Omega, 8(16), 14484-14489
Open this publication in new window or tab >>Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy
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2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 16, p. 14484-14489Article in journal (Refereed) Published
Abstract [en]

Among the existing materials for heat conversion, high-entropy alloys are of great interest due to the tunability of their functional properties. Here, we aim to produce single-phase high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing their thermoelectric (TE) properties. This material was successfully obtained before via a different technique, which requires a very long processing time. Hence, the main target of this work is to apply spark plasma sintering, a much faster and scalable process. The samples were sintered in the temperature range of 1200–1300 °C. Two main phases were formed: rock salt-structured Fm3̅m and spinel-structured Fd3̅m. Comparable transport properties were achieved via the new approach: the highest value of the Seebeck coefficient reached −112.6 μV/K at room temperature, compared to −150 μV/K reported before; electrical properties at high temperatures are close to the properties of the single-phase material (σ = 0.2148 S/cm, σ ≈ 0.2009 S/cm reported before). These results indicate that SPS can be successfully applied to produce highly efficient TE high-entropy alloys in a fast and scalable way. Further optimization is needed for the production of single-phase materials, which are expected to exhibit an even better TE functionality.

Place, publisher, year, edition, pages
American Chemical Society, 2023
National Category
Materials Chemistry
Research subject
Experimental Physics; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-97040 (URN)10.1021/acsomega.2c08278 (DOI)2-s2.0-85154024927 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg FoundationLuleå University of Technology
Note

Validerad;2023;Nivå 2;2023-05-10 (joosat);

Funder: Swedish Foundations Consolidator Fellowship;

Licens fulltext: CC BY License

Available from: 2023-05-10 Created: 2023-05-10 Last updated: 2023-05-10Bibliographically approved
Ibrahim, K. B., Shifa, T. A., Bordin, M., Moretti, E., Wu, H.-L. & Vomiero, A. (2023). Confinement Accelerates Water Oxidation Catalysis: Evidence from In Situ Studies. Small Methods, 7(10), Article ID 2300348.
Open this publication in new window or tab >>Confinement Accelerates Water Oxidation Catalysis: Evidence from In Situ Studies
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2023 (English)In: Small Methods, E-ISSN 2366-9608, Vol. 7, no 10, article id 2300348Article in journal (Refereed) Published
Abstract [en]

Basic insight into the structural evolution of electrocatalysts under operating conditions is of substantial importance for designing water oxidation catalysts. The first-row transition metal-based catalysts present state-of-the-art oxygen evolution reaction (OER) performance under alkaline conditions. Apparently, confinement has become an exciting strategy to boost the performance of these catalysts. The van der Waals (vdW) gaps of transition metal dichalcogenides are acknowledged to serve as a suitable platform to confine the first-row transition metal catalysts. This study focuses on confining Ni(OH)2 nanoparticle in the vdW gaps of 2D exfoliated SnS2 (Ex-SnS2) to accelerate water oxidation and to guarantee long term durability in alkaline solutions. The trends in oxidation states of Ni are probed during OER catalysis. The in situ studies confirm that the confined system produces a favorable environment for accelerated oxygen gas evolution, whereas the un-confined system proceeds with a relatively slower kinetics. The outstanding OER activity and excellent stability, with an overpotential of 300 mV at 100 mA cm−2 and Tafel slope as low as 93 mV dec−1 results from the confinement effect. This study sheds light on the OER mechanism of confined catalysis and opens up a way to develop efficient and low-cost electrocatalysts.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-99370 (URN)10.1002/smtd.202300348 (DOI)001016136800001 ()37350490 (PubMedID)2-s2.0-85162689269 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg Foundation, KAW 2016.346ÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Note

Validerad;2023;Nivå 2;2023-11-02 (joosat);

Funder: MOST (Ministry of Science and Technology) Taiwan (Contract nos. 110-2113-M-002 -019 -MY3)

Licens fulltext: CC BY-NC License

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2023-11-02Bibliographically approved
Kumar, S., Tahira, A., Bhatti, A. L., Aftab, U., Nafady, A., Kumar, S., . . . Ibupoto, Z. H. (2023). Electronic and structural disorder of NiCo2O4 nanostructures using phytochemicals from desert gourd offered efficient asymmetric supercapacitor and oxygen evolution reaction. Journal of Energy Storage, 72, Article ID 108728.
Open this publication in new window or tab >>Electronic and structural disorder of NiCo2O4 nanostructures using phytochemicals from desert gourd offered efficient asymmetric supercapacitor and oxygen evolution reaction
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2023 (English)In: Journal of Energy Storage, ISSN 2352-152X, E-ISSN 2352-1538, Vol. 72, article id 108728Article in journal (Refereed) Published
Abstract [en]

Place, publisher, year, edition, pages
Elsevier, 2023
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-101224 (URN)10.1016/j.est.2023.108728 (DOI)2-s2.0-85168116956 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-09-06 (hanlid);

Funder: King Saud University, Riyadh, Saudi Arabia (RSP2023R79)

Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-09-06Bibliographically approved
Solomon, G., Lecca, M., Bisetto, M., Gilzad Kohan, M., Concina, I., Natile, M. M. & Vomiero, A. (2023). Engineering Cu2O Nanowire Surfaces for Photoelectrochemical Hydrogen Evolution Reaction. ACS Applied Energy Materials, 6(2), 832-840
Open this publication in new window or tab >>Engineering Cu2O Nanowire Surfaces for Photoelectrochemical Hydrogen Evolution Reaction
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2023 (English)In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 6, no 2, p. 832-840Article in journal (Refereed) Published
Abstract [en]

Cu2O is a narrow band gap material serving as an important candidate for photoelectrochemical hydrogen evolution reaction. However, the main challenge that hinders its practical exploitation is its poor photostability, due to its oxidation into CuO by photoexcited holes. Here, we thoroughly minimize the photo-oxidation of Cu2O nanowires by growing a thin layer of the TiO2 protective layer and an amorphous layer of the VOx cocatalyst using magnetron sputtering and atomic layer deposition, respectively. After optimization of the protective and the cocatalyst layers, the photoelectrode exhibits a current density of −2.46 mA/cm2 under simulated sunlight (100 mW/cm2) at 0.3 V versus reversible hydrogen electrode, and its performance is stable for an extended illumination time. The chemical stability and the good performance of the engineered photoelectrode demonstrate the potential of using earth-abundant materials as a light-harvesting device for solar hydrogen production.

Place, publisher, year, edition, pages
American Chemical Society, 2023
Keywords
atomic layer deposition, Cu2O photoelectrode, magnetron deposition, photoelectrochemical hydrogen evolution, water splitting
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-95364 (URN)10.1021/acsaem.2c03122 (DOI)000908364800001 ()2-s2.0-85146159928 (Scopus ID)
Funder
The Kempe FoundationsLuleå University of TechnologyKnut and Alice Wallenberg Foundation
Note

Validerad;2023;Nivå 2;2023-01-23 (joosat);

Funder: ICMATE-CNR (B93C22000630006); Swedish Foundations

Available from: 2023-01-23 Created: 2023-01-23 Last updated: 2023-01-23Bibliographically approved
Ibrahim, K. B., Shifa, T. A., Moras, P., Moretti, E. & Vomiero, A. (2023). Facile Electron Transfer in Atomically Coupled Heterointerface for Accelerated Oxygen Evolution. Small, 19(1), Article ID 2204765.
Open this publication in new window or tab >>Facile Electron Transfer in Atomically Coupled Heterointerface for Accelerated Oxygen Evolution
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2023 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 19, no 1, article id 2204765Article in journal (Refereed) Published
Abstract [en]

An efficient and cost-effective approach for the development of advanced catalysts has been regarded as a sustainable way for green energy utilization. The general guideline to design active and efficient catalysts for oxygen evolution reaction (OER) is to achieve high intrinsic activity and the exposure of more density of the interfacial active sites. The heterointerface is one of the most attractive ways that plays a key role in electrochemical water oxidation. Herein, atomically cluster-based heterointerface catalysts with strong metal support interaction (SMSI) between WMn2O4 and TiO2 are designed. In this case, the WMn2O4 nanoflakes are uniformly decorated by TiO2 particles to create electronic effect on WMn2O4 nanoflakes as confirmed by X-ray absorption near edge fine structure. As a result, the engineered heterointerface requires an OER onset overpotential as low as 200 mV versus reversible hydrogen electrode, which is stable for up to 30 h of test. The outstanding performance and long-term durability are due to SMSI, the exposure of interfacial active sites, and accelerated reaction kinetics. To confirm the synergistic interaction between WMn2O4 and TiO2, and the modification of the electronic structure, high-resolution transmission electron microscopy (HR-TEM), X-ray photoemission spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) are used.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
active site, heterointerfaces, oxygen evolution reactions, strong metal support interaction (SMSI), synergy
National Category
Materials Chemistry Condensed Matter Physics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-94173 (URN)10.1002/smll.202204765 (DOI)000880729900001 ()36354170 (PubMedID)2-s2.0-85142001224 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation, KAW 2016.346The Kempe FoundationsÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Note

Validerad;2023;Nivå 2;2023-03-08 (joosat);

Licens fulltext: CC BY License

Available from: 2022-11-21 Created: 2022-11-21 Last updated: 2023-03-08Bibliographically approved
Li, J., Chen, J., Zhao, X., Vomiero, A. & Gong, X. (2023). High-loading of organosilane-grafted carbon dots in high-performance luminescent solar concentrators with ultrahigh transparency. Nano Energy, 115, Article ID 108674.
Open this publication in new window or tab >>High-loading of organosilane-grafted carbon dots in high-performance luminescent solar concentrators with ultrahigh transparency
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2023 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 115, article id 108674Article in journal (Refereed) Published
Abstract [en]

Carbon dots (CDs) generally suffer from aggregation-induced fluorescence quenching effect in solid-state, which significantly limits their application in photoelectric devices. Due to this effect, it is a great challenge to achieve high-transparency and high-performance luminescent solar concentrators (LSCs) based on CDs. Here, the synthesis of organosilane-grafted carbon dots (Si-CDs) is rationally designed by hydrothermal method using anhydrous citric acid, ethanolamine and KH-792 as the reaction precursors. The obtained Si-CDs can be uniformly dispersed in the polyvinyl alcohol (PVA) matrix through the dehydration condensation reaction and hydrogen bonding between the silicon hydroxyl group of Si-CDs and the hydroxyl group of PVA. Based on this property, Si-CDs/PVA thin-film LSCs (5 × 5 × 0.2 cm3) with ultrahigh CD loading (25 wt%) and high transparency can be fabricated, exhibiting excellent absorption in the UV spectral region and about 90 % transmission in the visible range. Furthermore, the power conversion efficiency (PCE) of the LSCs can reach 2.09 % under a standard solar light and shows excellent stability even over 12 weeks. This synthetic design is expected to be beneficial for future development of CD synthesis and paves the way for the development of CDs-based photoelectric devices.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
High-loading, Highly transparent, Luminescent solar concentrators, Organosilane-grafted carbon dots, UV shielding
National Category
Other Physics Topics Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-99408 (URN)10.1016/j.nanoen.2023.108674 (DOI)2-s2.0-85165538193 (Scopus ID)
Funder
The Kempe FoundationsWallenberg FoundationsLuleå University of Technology
Note

Validerad;2023;Nivå 2;2023-08-09 (hanlid);

Funder: National Natural Science Foundation of China (21774098); Ministry of Education, China (B18038)

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2023-08-09Bibliographically approved
Shifa, T. A., Gradone, A., Yusupov, K., Ibrahim, K. B., Jugovac, M., Sheverdyaeva, P. M., . . . Vomiero, A. (2023). Interfacing CrOx and CuS for synergistically enhanced water oxidation catalysis. Chemical Engineering Journal, 453(Part 1), Article ID 139781.
Open this publication in new window or tab >>Interfacing CrOx and CuS for synergistically enhanced water oxidation catalysis
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2023 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 453, no Part 1, article id 139781Article in journal (Refereed) Published
Abstract [en]

The sluggish kinetics associated with the oxygen evolution reaction (OER) limits the sustainability of fuel production and chemical synthesis. Developing catalysts based on Earth abundant elements with a reasonable strategy could solve the challenge. Here, we present a heterostructure built from CrOx and CuS whose interface gives rise to the advent of new functionalities in catalytic activity. Using X-ray photoelectron and absorption spectroscopies, we identified the multiple oxidation states and low coordination number of Cr metal in CrOx-CuS heterostructure. Benefitting from these features, CrOx-CuS generates oxygen gas through water splitting with a low over potential of 190 mV vs RHE at a current density of 10 mA cm−2. The catalyst shows no evident deactivation after a 36-hours operation in alkaline medium. The high catalytic activity, inspired by first principles calculations, and long-time durability make it one of the most effective OER electrocatalysts.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Chemical vapor deposition, DFT, Heterostructure, Hydrothermal, Oxygen evolution
National Category
Materials Chemistry Other Chemical Engineering
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-93767 (URN)10.1016/j.cej.2022.139781 (DOI)000886099800003 ()2-s2.0-85140046834 (Scopus ID)
Funder
The Kempe Foundations, (JCK1505, JCK1703, SMK1839)Knut and Alice Wallenberg Foundation, KAW 2016.346, KAW 2020.0033ÅForsk (Ångpanneföreningen's Foundation for Research and Development)Göran Gustafsson Foundation for Research in Natural Sciences and Medicine
Note

Validerad;2022;Nivå 2;2022-11-02 (joosat);

Funder: CNR ISM e Dipartimento di Scienze Molecolari e Nanosistemi Università Cà Foscari Venezia (709, 14/04/2021); EUROFEL-ROADMAP ESFRI 

Available from: 2022-11-02 Created: 2022-11-02 Last updated: 2023-02-28Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-2935-1165

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