Effect of molten carbonate composition on oxygen reduction under pressurized conditions: Cyclic voltammetry and equivalent circuit analysis

M. Mohamedi, Y. Hisamitsu, Y. Ono, T. Itoh, I. Uchida

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The oxygen reduction mechanism was investigated in carbonate melts of variable composition ranging from the eutectics Li-K, Li-Na to ternary Li-Na-K melts. The effect of pressure on electrode kinetics was also examined. Cyclic voltammetry, convolution voltammetry and electrochemical impedance spectroscopy have shown that oxygen reduction is mass-transfer limited in all melt compositions investigated. It was also found that pressurizing increased the concentration of oxygen electroactive species. To gain information about the reaction mechanism, the impedance spectra have been fitted to four possible equivalents circuits: (i) Randles circuit, (ii) Randles circuit extended by a parallel RC circuit due to film formation, (iii) Gerisher (homogeneous reaction) impedance, and (iv) Modified Randles circuit. The discussion of the results is based on careful analysis of fit quality and meaningfulness of fit parameters.

Original languageEnglish
Pages (from-to)1397-1404
Number of pages8
JournalJournal of Applied Electrochemistry
Volume30
Issue number12
DOIs
Publication statusPublished - 2000 Dec

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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