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Open AccessFeature PaperArticle

Comparing the Thermal and Electrochemical Stabilities of Two Structurally Similar Ionic Liquids

1
Chemistry of Interfaces, Luleå University of Technology, SE-971 87 Luleå, Sweden
2
Department of Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
*
Authors to whom correspondence should be addressed.
Academic Editors: Johan Jacquemin and Fouad Ghamouss
Molecules 2020, 25(10), 2388; https://doi.org/10.3390/molecules25102388
Received: 29 April 2020 / Revised: 18 May 2020 / Accepted: 18 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Ionic Liquids, from Their Synthesis to Their Applications)
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. View Full-Text
Keywords: ionic liquids; thermo-gravimetric analysis; ionic conductivity; electrochemical stability ionic liquids; thermo-gravimetric analysis; ionic conductivity; electrochemical stability
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MDPI and ACS Style

Shah, F.U.; Khan, I.A.; Johansson, P. Comparing the Thermal and Electrochemical Stabilities of Two Structurally Similar Ionic Liquids. Molecules 2020, 25, 2388.

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