Studies of Oxygen Exchange on Thin-Film La0.6Sr0.4CoO3-δ Using Nonlinear Electrochemical Impedance Spectroscopy (NLEIS)

被引：0
|
作者：
Wilson, Jamie R. [1 ]
Sase, Maya
Kawada, Tatsuya
Adler, Stuart B. [1 ]
机构：
[1] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA
来源：
SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2 | 2007年 / 7卷 / 01期
关键词：
D O I：
10.1149/1.2729206
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. (LSC-64). 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 LSC-64 is limited by dissociative adsorption. These results are discussed in the context of known equilibrium exchange kinetics and electronic structure. Implications for porous electrode kinetics are also discussed.
引用
收藏
页码：1089 / 1096
页数：8
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