Measurement of oxygen exchange kinetics on thin-film La0.6Sr0.4CoO3-δ using nonlinear electrochemical impedance spectroscopy

被引：39

作者：

Wilson, Jamie R. ^{[1
]}

Sase, Maya

Kawada, Tatsuya

Adler, Stuart B.

机构：

[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2007年 / 10卷 / 05期

关键词：

D O I：

10.1149/1.2710178

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In order to probe the mechanism of O-2 reduction on mixed-conducting oxides, we have measured the nonlinear harmonic impedance response of a dense thin-film electrode of La0.6Sr0.4CoO3-delta. By combining a well-defined geometry with detection of small nonlinear harmonics, this approach reveals the nonlinear rate law governing O-2 reduction/oxidation. Comparison to various models based on nonequilibrium thermodynamics suggests that O-2 reduction on La0.6Sr0.4CoO3-delta is limited by dissociative adsorption. To the authors' knowledge, this is the first isolation of the full nonlinear rate law governing O-2 exchange on a perovskite oxide. (c) 2007 The Electrochemical Society.

引用

页码：B81 / B86

页数：6

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