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Oxygen exchange kinetics on solid oxide fuel cell cathode materials—general trends and their mechanistic interpretation

Published online by Cambridge University Press:  03 July 2012

Lei Wang ,
Rotraut Merkle ,
Yuri A. Mastrikov ,
Eugene A. Kotomin  and
Joachim Maier
Lei Wang
Affiliation:
Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
Rotraut Merkle*
Affiliation:
Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
Yuri A. Mastrikov
Affiliation:
Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany; and University of Maryland, College Park, Maryland 20742-2115
Eugene A. Kotomin
Affiliation:
Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
Joachim Maier
Affiliation:
Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany
*
b)Address all correspondence to this author. e-mail: r.merkle@fkf.mpg.de
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Abstract

The compilation of measured effective rate constants for oxygen surface exchange on mixed conducting perovskites, which covers a great variety of compositions ranging from (La,Sr)MnO3−δ to (La,Sr)(Co,Fe)O3−δ and (Ba,Sr)(Co,Fe)O3−δ, demonstrates the importance of ionic conductivity—i.e., high oxygen vacancy concentration as well as vacancy mobility—as a key factor for the surface oxygen exchange rate. This interpretation is corroborated by ab initio calculations, which indicate that the approach of an oxygen vacancy to oxygen intermediates adsorbed on the surface is the rate determining step for a number of perovskites.

Keywords

SOFCpoint defectssurface reactionmechanismABO3 perovskites
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 15: Focus Issue: Advanced Materials for Fuel Cells , 14 August 2012 , pp. 2000 - 2008
Copyright
Copyright © Materials Research Society 2012

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