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

ABSTRACT: Here we focus on the thermal and variable temperature electrochemical stabilities of two ionic liquids (ILs) having a common tributyloctyl phosphonium cation [P_4,4,4,8]⁺ and two different orthoborate anions: bis(mandelato)borate [BMB]^- and bis(salicylato)borate [BScB]^-. The thermo-gravimetric analysis data suggest that [P_4,4,4,8][BScB] is thermally more stable than [P_4,4,4,8][BMB] in both nitrogen atmosphere and air, while the impedance spectroscopy reveals that [P_4,4,4,8][BScB] has higher ionic conductivity than [P_4,4,4,8][BMB] over the whole studied temperature range. In contrast, the electrochemical studies confirm that [P_4,4,4,8][BMB] is more stable and exhibits a wider electrochemical stability window (ESW) on a glassy carbon electrode surface as compared to [P_4,4,4,8][BScB]. A continuous decrease in the ESWs of both ILs is observed as a function of operation temperature.

SUBMITTER: Shah FU

PROVIDER: S-EPMC7287963 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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

Shah Faiz Ullah FU Khan Inayat Ali IA Johansson Patrik P

Molecules (Basel, Switzerland) 20200521 10

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 imp ...[more]

PMID: 32455570

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