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Preparation and characterization of copper based cermet anodes for use in solid oxide fuel cells at intermediate temperatures

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N. E. Kiratzis, P. Connor, J. T. S. Irvine

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Two Cu-based anode cermets suitable for direct hydrocarbon oxidation in Solid Oxide Fuel Cells (SOFC) based on yttria stabilized zirconia (YSZ) electrolyte were tested in the temperature range (500-800A degrees C). The ceramic components were CeO2 and the perovskite La0.75Sr0.25Cr0.5Mn0.5O3-d (LSCM). The cermets were made in both the form of pellets and films applied onto the YSZ electrolytes. Pellets exhibited good mechanical strength and resistance to fracture in both oxidized and reduced state. Cu-LSCM cermets exhibited good redox cycling behavior between 700-800A degrees C. Reduction temperature plays a significant role on final morphology with Cu segregation occurring at 800A degrees C. Cu-LSCM films were found to exhibit lower polarization resistances than Cu-CeO2 under 5% H-2. Examination of the data revealed a poorer contact of the Cu-CeO2 electrode with the YSZ surface than the Cu-LSCM electrode. Reduction temperature should be less than 750A degrees C to ensure suitable microstructure and adhesion of both film electrodes with the electrolyte.



Original languageEnglish
Pages (from-to)270-287
Number of pages18
JournalJournal of Electroceramics
Issue number4
Publication statusPublished - Jun 2010

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