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

Yasushi Katayama, Hokuto Onodera, Masaki Yamagata, Takashi Miura

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125 Citations (Scopus)

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
JournalJournal of the Electrochemical Society
Volume151
Issue number1
DOIs
Publication statusPublished - 2004

Fingerprint

molten salts
Cations
Molten materials
inorganic peroxides
Salts
Positive ions
Superoxides
Oxygen
Imides
cations
imides
room temperature
oxygen
Ions
Gold
gold
Ionic Liquids
Temperature
ions
Electrodes

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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Electrochemical reduction of oxygen in some hydrophobic room-temperature molten salt systems. / Katayama, Yasushi; Onodera, Hokuto; Yamagata, Masaki; Miura, Takashi.

In: Journal of the Electrochemical Society, Vol. 151, No. 1, 2004.

Research output: Contribution to journalArticle

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