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
收藏
页码：B81 / B86
页数：6
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