Stability and kinetics of generated superoxide ion in trifluoromethanesulfonate anion-based ionic liquids

Maan Hayyan, Farouq S. Mjalli, Inas M. AlNashef, Mohd Ali Hashim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The generation and long-term stability of superoxide ion (O2 •-) in two trifluoromethanesulfonate [TfO]- anion-based ionic liquids (ILs), with cations of 1-butyl-1-methylpyrrolidinium [BMPyrr]+ and 1-butyl-2,3-dimethylimidazolium [BDMIm]+ have been investigated. The electrochemical generation was carried out by reducing O2 to O2 •- in ILs and was analyzed using a cyclic voltammetry (CV) technique. The chemical generation of O2 •- in ILs was carried out by the solvation of potassium superoxide (KO2) in the aprotic solvent, dimethyl sulfoxide, in the presence of the corresponding IL. Long-term stability of generated O2 •- in ILs was examined using UV-visible spectrophotometery at an absorbance range of 190-400 nm. It was found that the [BMPyrr]+ based IL has a lower O2 •- consumption rate than the [BDMIm]+ based ILs indicating that [BMPyrr][TfO] offers a promising long-term stability of O2 •- for various reactions and applications. This work represents the first attempt for using the [TfO]- based ILs as media for the chemical and electrochemical generation of O2 •-.

Original languageEnglish
Pages (from-to)9658-9667
Number of pages10
JournalInternational Journal of Electrochemical Science
Volume7
Issue number10
Publication statusPublished - 2012

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Keywords

  • Cyclic voltammetry
  • Imidazolium cation
  • Ionic liquids
  • Long-term stability
  • Pyrrolidinium cation
  • Superoxide ion
  • Trifluoromethanesulfonate anion

ASJC Scopus subject areas

  • Electrochemistry

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