Composition dependence of the oxygen-evolution reaction rate on IrxTi1-xO2 mixed-oxide electrodes

Kazuki Endo, Yasushi Katayama, Takashi Miura, Tomiya Kishi

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Mudcrack-free oxide films of IrxTi1-xO2 (0 < x ≤ 1) on titanium substrates were obtained, and the effects of the oxide composition on the rate of oxygen-evolution reaction were investigated. At x ≥ 0.6, Ir-rich grains appear on the mudcrack-free surface. In the purely single-phase region (0 < x ≤ 0.5), the pseudo-capacitive charge is proportional to the surface composition, xs, and the exchange-current density for the oxygen-evolution reaction increases linearly with xs at 0.2 ≤ xs ≤ 0.5, with an extrapolated intercept at xs ∼ 0.15, below which the oxides are inactive.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalJournal of Applied Electrochemistry
Volume32
Issue number2
DOIs
Publication statusPublished - 2002 Feb 1

Keywords

  • IrO
  • Mixed oxide
  • Oxygen evolution
  • Reaction rate
  • TiO

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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