Electrochemical reduction of dioxygen in Bis (trifluoromethylsulfonyl) imide based ionic liquids

Maan Hayyan, Farouq S. Mjalli, Mohd Ali Hashim, Inas M. Alnashef, Xue Mei Tan

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47 Citations (Scopus)

Abstract

Electrochemical generation of superoxide ion (O2-) has been investigated in three room temperature ionic liquids (ILs), based on bis (trifluoromethylsulfonyl) imide anion, [N(Tf)2]-, comprising the following cations N-(3-Hydroxypropyl)pyridinium, [HPPy] +, 1-(3-methoxypropyl)-1-methylpiperidinium, [MOPMPip]+, and 1-hexyl-1-methyl-pyrrolidinium, [HMPyrr]+. Cyclic voltammetry (CV) and chronoamperometry (CA) techniques were used for the analysis of the the electrochemical process. It was found that the generated O2- was not stable in the IL based on pyridinium cation, [HPPy]+. While a stable O2- was electrochemically generated in [MOPMPip]+ and [HMPyrr]+ based ILs. CV and CA techniques were used to determine the diffusion coefficients of O2 and solubility of oxygen in the studied ILs as a function of temperature. The diffusional activation energies were then determined. It was found that [HMPyrr]+ based IL, in general, has higher diffusion coefficient and solubility of O2 and less diffusional activation energy than [MOPMPip]+ based IL. For our best knowledge, this is the first time piperidinium based ILs has been used for the electrochemical generation of O2.

Original languageEnglish
Pages (from-to)150-157
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume657
Issue number1-2
DOIs
Publication statusPublished - Jul 1 2011

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Keywords

  • Chronoamperometry
  • Cyclic voltammetry
  • Piperidinium
  • Pyridinium
  • Pyrrolidinium
  • Superoxide ion

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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