Comparing the thermal and electrochemical stabilities of two structurally similar ionic liquids
Artikel i vetenskaplig tidskrift, 2020

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 thermogravimetric 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.

Electrochemical stability

Ionic conductivity

Thermo-gravimetric analysis

Ionic liquids


Faiz Ullah Shah

Luleå tekniska universitet

Inayat Ali Khan

Luleå tekniska universitet

Patrik Johansson

Chalmers, Fysik, Materialfysik


1420-3049 (ISSN) 14203049 (eISSN)

Vol. 25 10 2388


Oorganisk kemi



Annan fysik



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