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Comparing the Thermal and Electrochemical Stabilities of Two Structurally Similar Ionic Liquids
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0003-3652-7798
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.ORCID iD: 0000-0002-7940-7297
Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
2020 (English)In: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 25, no 10, article id 2388Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 25, no 10, article id 2388
Keywords [en]
ionic liquids, thermo-gravimetric analysis, ionic conductivity, electrochemical stability
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-78965DOI: 10.3390/molecules25102388ISI: 000539293400121PubMedID: 32455570Scopus ID: 2-s2.0-85085318384OAI: oai:DiVA.org:ltu-78965DiVA, id: diva2:1431527
Funder
Swedish Research Council
Note

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

Available from: 2020-05-22 Created: 2020-05-22 Last updated: 2023-09-04Bibliographically approved

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Shah, Faiz UllahKhan, Inayat Ali

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