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

Kazuki Endo; Yasushi Katayama; Takashi Miura; Tomiya Kishi

doi:10.1023/A:1014770015236

Composition dependence of the oxygen-evolution reaction rate on Ir_xTi_1-xO₂ mixed-oxide electrodes

Kazuki Endo, Yasushi Katayama, Takashi Miura, Tomiya Kishi

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Mudcrack-free oxide films of Ir_xTi_1-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, x_s, and the exchange-current density for the oxygen-evolution reaction increases linearly with x_s at 0.2 ≤ x_s ≤ 0.5, with an extrapolated intercept at x_s ∼ 0.15, below which the oxides are inactive.

Original language	English
Pages (from-to)	173-178
Number of pages	6
Journal	Journal of Applied Electrochemistry
Volume	32
Issue number	2
DOIs	https://doi.org/10.1023/A:1014770015236
Publication status	Published - 2002 Feb

Keywords

IrO
Mixed oxide
Oxygen evolution
Reaction rate
TiO

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry
Materials Chemistry

Access to Document

10.1023/A:1014770015236

Cite this

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title = "Composition dependence of the oxygen-evolution reaction rate on IrxTi1-xO2 mixed-oxide electrodes",

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.",

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AU - Endo, Kazuki

AU - Katayama, Yasushi

AU - Miura, Takashi

AU - Kishi, Tomiya

PY - 2002/2

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N2 - 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.

AB - 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.

KW - IrO

KW - Mixed oxide

KW - Oxygen evolution

KW - Reaction rate

KW - TiO

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