The polarization resistance of mixed conducting SOFC cathodes: A comparative study using thin film model electrodes

被引：100

作者：

Baumann, F. S. ^{[2
]}

Maier, J. ^{[2
]}

Fleig, J. ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Chem Technol & Analy, A-1060 Vienna, Austria

[2] Max Planck Inst Solid State Res, D-70563 Stuttgart, Germany

来源：

SOLID STATE IONICS | 2008年 / 179卷 / 21-26期

关键词：

mixed conductor; impedance spectroscopy; electrode kinetics; microelectrodes; thin film;

D O I：

10.1016/j.ssi.2008.02.059

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The oxygen reduction reaction on YSZ solid electrolytes is investigated by means of thin film microelectrodes employing perovskite-type mixed conductors such as La0.6Sr0.4Co0.8Fe0.2O3-delta, Ba0.5Sr0.5Co0.8Fe0.2O3-delta and Sm0.5Sr0.5CoO3-delta as electrode materials. Owing to the simple geometry of the circular microclectrodes direct comparison of electrochemical material parameters is possible and reveals that the Fe/Co ratio in La0.6Sr0.4Co1-xFexO3-delta has only little effect on the resistance associated with the surface oxygen exchange. Ba0.5Sr0.5Co0.8Fe0.2O3-delta in films exhibit very low surface-related polarization resistances. Strongly decreased resistances can also be observed in Co-rich La0.6Sr0.4Co1-xFexO3-delta electrodes after a cathodic voltage pulse treatment of several tens of seconds. Area-related surface resistances below 0.1 Omega cm(2) at 700 degrees C can be achieved by such activation. Further phenomena associated with this voltage activation are discussed. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：1198 / 1204

页数：7

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