Electrochemical reduction of oxygen in some hydrophobic room-temperature molten salt systems

Yasushi Katayama, Hokuto Onodera, Masaki Yamagata, Takashi Miura

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Abstract

The electrochemical reduction of oxygen was investigated in some hydrophobic room-temperature molten salt systems (ionic liquids) consisting of bis(trifluoromethanesulfone)imide (TFSI-) anion with trimethyl-n-hexylammonium (TMHA+), 1-butyl-1-methylpyrrolidinium (BMP+), 1-ethyl-3-methylimidazolium (EMI+) or 1,2-dimethyl-3-propylimidazolium (DMPI+) cation. The oxygen dissolved in these melts was reduced to the superoxide ion on a gold electrode. The superoxide ion was stable against the aliphatic and alicyclic organic cations (TMHA+ and BMP+) but reacted with the aromatic ones (EMI+ and DMPI+), suggesting that nucleophilic reagents attack the melts consisting of imidazolium cations. The acceptor number of these TFSI--based molten salt systems was estimated to be comparable to those of acetonitrile and dimethyl sulfoxide from the comparison of the redox potential of O2/O2-. The superoxide ion was further reduced, presumably to the peroxide, on a gold electrode in the melts consisting of the aliphatic or alicyclic organic cation.

Original languageEnglish
Pages (from-to)A59-A63
JournalJournal of the Electrochemical Society
Volume151
Issue number1
DOIs
Publication statusPublished - 2004 Feb 16

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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