Mechanism of La0.6Sr0.4Co0.2Fe0.8O3 cathode degradation

Elemental enrichment behavior on the surface of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) was investigated in order to understand potential degradation mechanism of solid oxide fuel cell cathodes. Surface morphological changes were examined using scanning electron microscopy after heat treatment in the temperat...

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Bibliographic Details
Published in:Journal of materials research 2012-08, Vol.27 (15), p.1992-1999
Main Authors: Oh, Dongjo, Gostovic, Danijel, Wachsman, Eric D.
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied and Technical Physics
Biomaterials
Cathodes
Cathodic corrosion
Degradation
Heat
Heat treating
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Morphology
Nanotechnology
Scanning electron microscopy
Solid oxide fuel cells
Spectrum analysis
Studies
Transmission electron microscopy
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Summary:Elemental enrichment behavior on the surface of La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) was investigated in order to understand potential degradation mechanism of solid oxide fuel cell cathodes. Surface morphological changes were examined using scanning electron microscopy after heat treatment in the temperature range of 600–900 °C. Submicron-sized precipitates were formed on grain surfaces after heat treatment. Their shapes appeared to be aligned along the surface orientations of the underlying grains. Auger electron spectroscopy and transmission electron microscopy characterization revealed that the precipitate was strontium (Sr)-oxygen (O) based. The formation of Sr–O precipitates was found to increase with increasing temperature and oxygen partial pressure. A defect chemistry model is presented based on the observed phenomena.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2012.222