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In situ X-ray Studies of (La,Sr)MnO3_δ, (La,Sr)CoO3_δ, and La0.6Sr0.4Co0.2Fe0.8O3-δ Thin Film SOFC Cathodes Grown by Pulse Laser Deposition

Published online by Cambridge University Press:  15 January 2013

Kee-Chul Chang ,
Brian Ingram ,
Paul Salvador ,
Bilge Yildiz  and
Hoydoo You
Kee-Chul Chang
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439USA
Brian Ingram
Affiliation:
Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, IL 60439USA
Paul Salvador
Affiliation:
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA 15213USA
Bilge Yildiz
Affiliation:
Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Hoydoo You
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439USA
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Abstract

We will briefly review in situ synchrotron x-ray investigation of model thin film cathode systems for solid oxide fuel cells. The film cathodes examined in this study are (La,Sr)MnO3_δ (LSM), (La,Sr)CoO3_δ (LSC), and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) thin films epitaxially grown on YSZ single crystal substrates by the pulse laser deposition technique. We find in all cases that Sr is enriched or segregated to the surface of the film cathodes. We concluded that the Sr enrichments or segregations are mainly the results of annealing because they do not depend on whether the cathodes are electrochemically biased or not during annealing. However, at least in the case of LSCF, we find that B-site Co segregates rather uniformly to the surface and the segregation responds sensitively and reversibly to the electrochemical bias.

Keywords

ionic conductoroxidex-ray fluorescence
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1495: Symposium I – Functional Materials for Solid Oxide Fuel Cells , 2013 , mrsf12-1495-i11-01
Copyright
Copyright © Materials Research Society 2013

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