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Khan, I. A., Wang, Y.-L. & Shah, F. U. (2022). Effect of structural variation in biomass-derived nonfluorinated ionic liquids electrolytes on the performance of supercapacitors. Journal of Energy Chemistry, 69, 174-184
Öppna denna publikation i ny flik eller fönster >>Effect of structural variation in biomass-derived nonfluorinated ionic liquids electrolytes on the performance of supercapacitors
2022 (Engelska)Ingår i: Journal of Energy Chemistry, ISSN 2095-4956, E-ISSN 2096-885X, Vol. 69, s. 174-184Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

There is a growing interest in sustainable and high performance supercapacitors (SCs) operating at elevated temperatures as they are highly demanded in heat-durable electronics. Here, we present a biomass-derived nonfluorinated ionic liquid (IL) [P4444][HFuA] and its structural analogue [P4444][TpA] as electrolytes for supercapacitors comprising multiwall carbon nanotubes and activated charcoal (MWCNTs/AC) mixed carbon composite electrodes. A detailed investigation of the effect of scan rate, temperature, potential window and orientation of ions on the electrodes surfaces is performed. The supercapacitors exhibited relatively lower specific capacitance for both [P4444][HFuA] and [P4444][TpA] ILs at room temperature. However, the specific capacitance has significantly increased with an increase in temperature and potential window. The equivalent serie resistances of the SCs is deceased with increasing temperatures, which is a result of improved ionic conductivities of the IL electrolytes. In CV cycling at 60 °C, the capacitor with [P4444][HFuA] IL-based electrolyte retained about 90% of its initial capacitance, while the capacitor with [P4444][TpA] IL-based electrolyte retained about 83% of its initial capacitance. Atomistic computations revealed that the aromatic [FuA]− and [TpA]− anions displayed perpendicular distribution that can effectively neutralize charges on the carbon surfaces. However, the [HFuA]− anion exhibited somewhat tilted configurations on the carbon electrode surfaces, contributing to their outstanding capacitive performance in electrochemical devices.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022
Nyckelord
Biomass, Ionic liquids, Carbon electrodes, Supercapacitors, Molecular dynamic simulations
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-88622 (URN)10.1016/j.jechem.2021.12.041 (DOI)000779910400005 ()2-s2.0-85123922923 (Scopus ID)
Forskningsfinansiär
Kempestiftelserna, SMK-1838Vetenskapsrådet, 2018-04133
Anmärkning

Validerad;2022;Nivå 2;2022-02-10 (sofila)

Tillgänglig från: 2021-12-30 Skapad: 2021-12-30 Senast uppdaterad: 2023-05-25Bibliografiskt granskad
Bhowmick, S., Filippov, A., Khan, I. A. & Shah, F. U. (2022). Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids. Physical Chemistry, Chemical Physics - PCCP, 24(38), 23289-23300
Öppna denna publikation i ny flik eller fönster >>Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids
2022 (Engelska)Ingår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 24, nr 38, s. 23289-23300Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

New structurally flexible 1-methyl- and 1,2-dimethyl-imidazolium phosphate ionic liquids (ILs) bearing oligoethers have been synthesized and thoroughly characterized. These novel ILs revealed high thermal stabilities, low glass transitions, high conductivity and wide electrochemical stability windows up to 6 V. Both anions and cations of 1-methyl-imidazolium ILs diffuse faster than the ions of 1,2-dimethyl-imidazolium ILs, as determined by pulsed field gradient nuclear magnetic resonance (PFG-NMR). The 1-methyl-imidazolium phosphate ILs showed relatively higher ionic conductivities and ion diffusivity as compare with the 1,2-dimethyl-imidazolium phosphate ILs. As expected, the diffusivity of all the anions and cations increases with an increase in the temperature. The 1-methyl-imidazolium phosphate ILs formed hydrogen bonding with the phosphate anions, the strength of which is decreased with increasing temperature, as confirmed by variable temperature 1H and 31P NMR spectroscopy. One of the representative IL, [EmDMIm][DEEP], presented a promising performance at elevated temperatures as an electrolyte in a supercapacitor composed of multiwall carbon nanotubes and activated charcoal (MWCNTs/AC) composite electrodes.

Ort, förlag, år, upplaga, sidor
Royal Society of Chemistry (RSC), 2022
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-92910 (URN)10.1039/d2cp03022e (DOI)000859131200001 ()36156000 (PubMedID)2-s2.0-85139573371 (Scopus ID)
Forskningsfinansiär
Stiftelsen Seth M. Kempes Minnes Stipendiefond, SMK-1945, SMK21- 0013Vetenskapsrådet, 2018-04133
Anmärkning

Validerad;2022;Nivå 2;2022-10-05 (joosat);

Tillgänglig från: 2022-09-09 Skapad: 2022-09-09 Senast uppdaterad: 2022-11-08Bibliografiskt granskad
Gnezdilov, O. I., Filippov, A., Khan, I. A. & Shah, F. U. (2022). Translational and reorientational dynamics of ionic liquid-based fluorine-free lithium-ion battery electrolytes. Journal of Molecular Liquids, 345, Article ID 117001.
Öppna denna publikation i ny flik eller fönster >>Translational and reorientational dynamics of ionic liquid-based fluorine-free lithium-ion battery electrolytes
2022 (Engelska)Ingår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 345, artikel-id 117001Artikel i tidskrift (Refereegranskat) Published
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.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022
Nyckelord
Diffusion, Ionic liquid electrolytes, Lithium salt doping effect, Reorientational dynamics
Nationell ämneskategori
Fysikalisk kemi Materialkemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-86448 (URN)10.1016/j.molliq.2021.117001 (DOI)000754557900005 ()2-s2.0-85111070226 (Scopus ID)
Forskningsfinansiär
Kempestiftelserna, SMK-1838Vetenskapsrådet, 2018-04133
Anmärkning

Validerad;2022;Nivå 2;2022-03-04 (hanlid);

Funder: Kazan Federal University (0671-2020-0051)

Tillgänglig från: 2021-07-26 Skapad: 2021-07-26 Senast uppdaterad: 2022-03-17Bibliografiskt granskad
Khan, I. A., Ivanovich Gnezdilov, O., Filippov, A. & Shah, F. U. (2021). Ion Transport and Electrochemical Properties of Fluorine-Free Lithium-Ion Battery Electrolytes Derived from Biomass. ACS Sustainable Chemistry and Engineering, 9(23), 7769-7780
Öppna denna publikation i ny flik eller fönster >>Ion Transport and Electrochemical Properties of Fluorine-Free Lithium-Ion Battery Electrolytes Derived from Biomass
2021 (Engelska)Ingår i: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 9, nr 23, s. 7769-7780Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Unlike conventional electrolytes, ionic liquid (IL)-based electrolytes offer higher thermal stability, acceptable ionic conductivity, and a higher electrochemical stability window (ESW), which are indispensable for the proper functioning of Li-ion batteries. In this study, fluorine-free electrolytes are prepared by mixing the lithium furan-2-carboxylate [Li(FuA)] salt with the tetra(n-butyl)phosphonium furan-2-carboxylate [(P4444)(FuA)] IL in different molar ratios. The anion of these electrolytes is produced from biomass and agricultural waste on a large scale and, therefore, this study is a step ahead toward the development of renewable electrolytes for batteries. The electrolytes are found to have Tonset higher than 568 K and acceptable ionic conductivities in a wide temperature range. The pulsed field gradient nuclear magnetic resonance (PFG-NMR) analysis has confirmed that the (FuA) anion diffuses faster than the (P4444)+ cation in the neat (P4444)(FuA) IL; however, the anion diffusion becomes slower than cation diffusion by doping Li salt. The Li+ ion interacts strongly with the carboxylate functionality in the (FuA) anion and diffuses slower than other ions over the whole studied temperature range. The interaction of the Li+ ion with the carboxylate group is also confirmed by 7Li NMR and Fourier transform infrared (FTIR) spectroscopy. The transference number of the Li+ ion is increased with increasing Li salt concentration. Linear sweep voltammetry (LSV) suggests lithium underpotential deposition and bulk reduction at temperatures above 313 K.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2021
Nyckelord
renewable electrolytes, furan-2-carboxylate, ionic conductivity, nuclear magnetic resonance, underpotential deposition
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-84900 (URN)10.1021/acssuschemeng.1c00939 (DOI)000662271200009 ()2-s2.0-85108425589 (Scopus ID)
Forskningsfinansiär
Kempestiftelserna, SMK-1838Vetenskapsrådet, 2018-04133
Anmärkning

Validerad;2021;Nivå 2;2021-07-16 (johcin);

Finansiär: Kazan Federal University (0671-2020-0051)

Tillgänglig från: 2021-06-04 Skapad: 2021-06-04 Senast uppdaterad: 2022-05-11Bibliografiskt granskad
Khan, S. I., Ahmad, S., Khan, I. A., Badshah, A., Rauf, M. K., Patujo, J., . . . Altaf, A. A. (2021). Mononuclear copper(i) complexes of triphenylphosphine and N,N′-disubstituted thioureas as potential DNA binding chemotherapeutics. New Journal of Chemistry, 45(20), 8925-8935
Öppna denna publikation i ny flik eller fönster >>Mononuclear copper(i) complexes of triphenylphosphine and N,N′-disubstituted thioureas as potential DNA binding chemotherapeutics
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2021 (Engelska)Ingår i: New Journal of Chemistry, ISSN 1144-0546, E-ISSN 1369-9261, Vol. 45, nr 20, s. 8925-8935Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this work, nine new mixed-ligand complexes with the general formula [CuBr(TPP)2Tu1–9] were synthesized. The copper(I) complexes of triphenylphosphine (TPP) and different N,N′-disubstituted thioureas (Tu) were characterized via spectroscopic techniques including Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (1H, 13C, and 31P NMR), and single-crystal X-ray diffraction (SC-XRD). The complexes were synthesized via the direct reaction of bromo(tris(triphenylphosphine)copper(I)) [BrCu(PPh3)3] precursor and thiourea ligand solution under ambient conditions. Complexes 1, 2 and 3 crystallized in a triclinic system with the P  space group. Each complex is mononuclear, and the copper atom is tetrahedrally attached to two TPP groups through the phosphorous atom, one thiourea molecule through the sulfur atom and one bromine atom. The synthesized compounds were docked with a DNA macromolecule to predict their binding site and it was found that all molecules showed favorable binding to the DNA minor grooves. The DNA interaction studies of the representative complexes demonstrated their efficient DNA binding affinities. Based on the docking and DNA interaction results, complex 7 was found to be the best binder with a docking affinity of 382.2 kJ mol−1 and binding constant of 3.96 × 104 M−1. This compound tends to interact with the minor groove through the bromine atom positioning the side triphenylphosphine rings along the X-axis of the groove while keeping the 1-(2-chlorobenzyl)-3-(3-(trifluoromethyl)phenyl)thiourea ring on the outside.

Ort, förlag, år, upplaga, sidor
Royal Society of Chemistry, 2021
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-84242 (URN)10.1039/D0NJ06182D (DOI)000645230000001 ()2-s2.0-85106734748 (Scopus ID)
Anmärkning

Validerad;2021;Nivå 2;2021-10-06 (alebob);

For correction, see: New J. Chem., 2021,45, 11399-11399, DOI: 10.1039/D1NJ90077C;

Finansiär: Higher Education Commission of Pakistan

Tillgänglig från: 2021-05-10 Skapad: 2021-05-10 Senast uppdaterad: 2022-07-01Bibliografiskt granskad
Hameed, A., Batool, M., Iqbal, W., Abbas, S., Imran, M., Khan, I. & Nadeem, M. A. (2021). ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation. Frontiers in Chemistry, 9, Article ID 686969.
Öppna denna publikation i ny flik eller fönster >>ZIF-12/Fe-Cu LDH Composite as a High Performance Electrocatalyst for Water Oxidation
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2021 (Engelska)Ingår i: Frontiers in Chemistry, E-ISSN 2296-2646, Vol. 9, artikel-id 686969Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Layered double hydroxides (LDH) are being used as electrocatalysts for oxygen evolution reactions (OERs). However, low current densities limit their practical applications. Herein, we report a facile and economic synthesis of an iron-copper based LDH integrated with a cobalt-based metal-organic framework (ZIF-12) to form LDH-ZIF-12 composite (1) through a co-precipitation method. The as-synthesized composite 1 requires a low overpotential of 337 mV to achieve a catalytic current density of 10 mA cm−2 with a Tafel slope of 89 mV dec−1. Tafel analysis further demonstrates that 1 exhibits a slope of 89 mV dec−1 which is much lower than the slope of 284 mV dec−1 for LDH and 172 mV dec−1 for ZIF-12. The slope value of 1 is also lower than previously reported electrocatalysts, including Ni-Co LDH (113 mV dec−1) and Zn-Co LDH nanosheets (101 mV dec−1), under similar conditions. Controlled potential electrolysis and stability test experiments show the potential application of 1 as a heterogeneous electrocatalyst for water oxidation.

Ort, förlag, år, upplaga, sidor
Frontiers Media S.A., 2021
Nyckelord
composite, co-precipitation, electrocatalysts, water oxidation, tafel analysis
Nationell ämneskategori
Materialkemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-85987 (URN)10.3389/fchem.2021.686968 (DOI)000670571400001 ()34249860 (PubMedID)2-s2.0-85109368798 (Scopus ID)
Anmärkning

Validerad;2021;Nivå 2;2021-07-15 (johcin);

Finansiär: Higher Education Commission (HEC) of Pakistan (8400/Federal/NRPU/R&D/HEC/2017)

Tillgänglig från: 2021-06-24 Skapad: 2021-06-24 Senast uppdaterad: 2021-08-17Bibliografiskt granskad
Khan, I., Badshah, A., Shah, F. U., Assiri, M. A. & Nadeem, M. A. (2021). Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction. ACS Omega, 6(10), 6780-6790
Öppna denna publikation i ny flik eller fönster >>Zinc-Coordination Polymer-Derived Porous Carbon-Supported Stable PtM Electrocatalysts for Methanol Oxidation Reaction
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2021 (Engelska)Ingår i: ACS Omega, E-ISSN 2470-1343, Vol. 6, nr 10, s. 6780-6790Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Porous carbon (PC) is obtained by carbonizing a zinc-coordination polymer (MOF-5) at 950 °C and PtM (M = Fe, Co, Ni, Cu, Zn) nanoparticles (NPs), which are deposited on PC using the polyol method. Structural and morphological characterizations of the synthesized materials are carried out by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HRTEM), and the porosity was determined using a N2 adsorption/desorption technique. The results revealed that PtM NPs are alloyed in the fcc phase and are well dispersed on the surface of PC. The electrochemical results show that PtM/PC 950 catalysts have higher methanol oxidation reaction (MOR) performances than commercial Pt/C (20%) catalysts. After 3000 s of chronoamperometry (CA) test, the MOR performances decreased in the order of Pt1Cu1/PC 950 > Pt1Ni1/PC 950 > Pt1Fe1/PC 950 > Pt1Zn1/PC 950 > Pt1Co1/PC 950. The high MOR activities of the synthesized catalysts are attributed to the effect of M on methanol dissociative chemisorption and improved tolerance of Pt against CO poisoning. The high specific surface area and porosity of the carbon support have an additional effect in boosting the MOR activities. Screening of the first row transition metals (d5+n, n = 1, 2, 3, 4, 5) alloyed with Pt binary catalysts for MOR shows that Pt with d8 (Ni) and d9 (Cu) transition metals, in equivalent atomic ratios, are good anode catalysts for alcohol fuel cells.

 

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2021
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-83437 (URN)10.1021/acsomega.0c05843 (DOI)000631101200029 ()33748591 (PubMedID)2-s2.0-85103384378 (Scopus ID)
Anmärkning

Validerad;2021;Nivå 2;2021-03-29 (johcin);

Finansiär: Higher Education Commission (HEC) of Pakistan (8400/Federal/NRPU/R&D/HEC/2017), (21-2009/SRGP/R&D/HEC/2018). Research center of advanced materials, King Khalid University, Saudi Arabia, (RCAMS/KKU/0020/20)

Tillgänglig från: 2021-03-29 Skapad: 2021-03-29 Senast uppdaterad: 2021-12-13Bibliografiskt granskad
Shah, F. U., Khan, I. A. & Johansson, P. (2020). Comparing the Thermal and Electrochemical Stabilities of Two Structurally Similar Ionic Liquids. Molecules, 25(10), Article ID 2388.
Öppna denna publikation i ny flik eller fönster >>Comparing the Thermal and Electrochemical Stabilities of Two Structurally Similar Ionic Liquids
2020 (Engelska)Ingår i: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 25, nr 10, artikel-id 2388Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Here we focus on the thermal and variable temperature electrochemical stabilities of two ionic liquids (ILs) having a common tributyloctyl phosphonium cation [P4,4,4,8]+ and two different orthoborate anions: bis(mandelato)borate [BMB] and bis(salicylato)borate [BScB]. The thermo-gravimetric analysis data suggest that [P4,4,4,8][BScB] is thermally more stable than [P4,4,4,8][BMB] in both nitrogen atmosphere and air, while the impedance spectroscopy reveals that [P4,4,4,8][BScB] has higher ionic conductivity than [P4,4,4,8][BMB] over the whole studied temperature range. In contrast, the electrochemical studies confirm that [P4,4,4,8][BMB] is more stable and exhibits a wider electrochemical stability window (ESW) on a glassy carbon electrode surface as compared to [P4,4,4,8][BScB]. A continuous decrease in the ESWs of both ILs is observed as a function of operation temperature.

Ort, förlag, år, upplaga, sidor
MDPI, 2020
Nyckelord
ionic liquids, thermo-gravimetric analysis, ionic conductivity, electrochemical stability
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-78965 (URN)10.3390/molecules25102388 (DOI)000539293400121 ()32455570 (PubMedID)2-s2.0-85085318384 (Scopus ID)
Forskningsfinansiär
Vetenskapsrådet
Anmärkning

Validerad;2020;Nivå 2;2020-06-10 (alebob)

Tillgänglig från: 2020-05-22 Skapad: 2020-05-22 Senast uppdaterad: 2023-09-04Bibliografiskt granskad
Khan, I. A., Gnezdilov, O. I., Wang, Y.-L., Filippov, A. & Shah, F. U. (2020). Effect of Aromaticity in Anion on the Cation–Anion Interactions and Ionic Mobility in Fluorine-Free Ionic Liquids. Journal of Physical Chemistry B, 124(52), 11962-11973
Öppna denna publikation i ny flik eller fönster >>Effect of Aromaticity in Anion on the Cation–Anion Interactions and Ionic Mobility in Fluorine-Free Ionic Liquids
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2020 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 124, nr 52, s. 11962-11973Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Ionic liquids (ILs) composed of tetra(n-butyl)phosphonium [P4444]+ and tetra(n-butyl)ammonium [N4444]+ cations paired with 2-furoate [FuA], tetrahydo-2-furoate [HFuA], and thiophene-2-carboxylate [TpA] anions are prepared to investigate the effects of electron delocalization in anion and the mutual interactions between cations and anions on their physical and electrochemical properties. The [P4444]+ cations-based ILs are found to be liquids, while the [N4444]+ cations-based ILs are semi-solids at room temperature. Thermogravimetric analysis revealed higher decomposition temperatures and differential scanning calorimetry analysis showed lower glass transition temperatures for phosphonium-based ILs than the ammonium-based counterparts. The ILs are arranged in the decreasing order of their ionic conductivities as [P4444][HFuA] (0.069 mS cm–1) > [P4444][FuA] (0.032 mS cm–1) > [P4444][TpA] (0.028 mS cm–1) at 20 °C. The oxidative limit of the ILs followed the sequence of [FuA]> [TpA]> [HFuA], as measured by linear sweep voltammetry. This order can be attributed to the electrons’ delocalization in [FuA] and in [TpA] aromatic anions, which has enhanced the oxidative limit potentials and the overall electrochemical stabilities.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2020
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-82139 (URN)10.1021/acs.jpcb.0c08421 (DOI)000605372100019 ()33347763 (PubMedID)2-s2.0-85099084649 (Scopus ID)
Forskningsfinansiär
Kempestiftelserna, SMK-1838Vetenskapsrådet, 2018-04133Knut och Alice Wallenbergs Stiftelse, KAW 2018.0380
Anmärkning

Validerad;2021;Nivå 2;2021-01-05 (alebob);

Finansiär: Kazan Federal University (0671-2020-0051)

Tillgänglig från: 2020-12-31 Skapad: 2020-12-31 Senast uppdaterad: 2021-12-13Bibliografiskt granskad
Khan, I. A. & Shah, F. U. (2020). Fluorine-Free Ionic Liquid-Based Electrolyte for Supercapacitors Operating at Elevated Temperatures. ACS Sustainable Chemistry and Engineering, 8(27), 10212-10221
Öppna denna publikation i ny flik eller fönster >>Fluorine-Free Ionic Liquid-Based Electrolyte for Supercapacitors Operating at Elevated Temperatures
2020 (Engelska)Ingår i: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 8, nr 27, s. 10212-10221Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We synthesized tetra(n-butyl)phosphonium furoate [P4444][FuA] ionic liquid (IL) by the reaction of tetra(n-butyl)phosphonium hydroxide and 2-furoic acid using water as a solvent at room temperature. The thermal stability and phase behavior of the IL are investigated through thermogravimetry (TGA) and differential scanning calorimetry (DSC), while the ionic conductivity measurement is carried out using impedance spectroscopy. Hybrid carbon-based material composed of multi walled carbon nanotubes (MWCNTs) and activated charcoal is fabricated and used as electrodes. The effect of potential scan rate, temperature and voltage on the electrochemical performance of the capacitor is thoroughly investigated through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results showed that the internal resistance and specific capacitance are highly dependent on the temperature and voltage, and a high specific capacitance of 141.4 F g−1 (5 mV s−1) from CV and 182 F g−1 (1 A g−1) from GCD at 100 °C is achieved, indicating an excellent electrochemical performance. The capacitor demonstrated 29.0 Wh kg−1 energy density and 13.3 kW kg−1 power density at 20 °C and 3 V potential, while 177 Wh kg−1 energy density and 82 kW kg−1 power density are achieved at higher temperature (100 °C). The FTIR analysis of the capacitor after electrochemical studies confirmed that no changes have occurred in the structure of the IL, indicating high electrochemical stability of the IL for supercapacitor applications in an extended temperature (−20 to 100 °C) and a wide potential range (3 V to 4.6 V).

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2020
Nyckelord
ionic liquids, ionic conductivity, cyclic voltammetry, energy density, capacitor
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-79688 (URN)10.1021/acssuschemeng.0c02568 (DOI)000551360900027 ()2-s2.0-85088634657 (Scopus ID)
Anmärkning

Validerad;2020;Nivå 2;2020-08-17 (alebob)

Tillgänglig från: 2020-06-16 Skapad: 2020-06-16 Senast uppdaterad: 2022-05-11Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-7940-7297

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