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Physical and electrochemical properties of new structurally flexible imidazolium phosphate ionic liquids
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0001-7514-8606
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-6810-1882
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-7940-7297
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-3652-7798
2022 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 24, no 38, p. 23289-23300Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC) , 2022. Vol. 24, no 38, p. 23289-23300
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-92910DOI: 10.1039/d2cp03022eISI: 000859131200001PubMedID: 36156000Scopus ID: 2-s2.0-85139573371OAI: oai:DiVA.org:ltu-92910DiVA, id: diva2:1694426
Funder
Stiftelsen Seth M. Kempes Minnes Stipendiefond, SMK-1945, SMK21- 0013Swedish Research Council, 2018-04133
Note

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

Available from: 2022-09-09 Created: 2022-09-09 Last updated: 2022-11-08Bibliographically approved

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Bhowmick, SouravFilippov, AndreiKhan, Inayat AliShah, Faiz Ullah

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