Preparation and characterization of copper based cermet anodes for use in solid oxide fuel cells at intermediate temperatures
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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 (500–800°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 700–800°C. Reduction temperature plays a significant role on final morphology with Cu segregation occurring at 800°C. Cu–LSCM films were found to exhibit lower polarization resistances than Cu–CeO2 under 5% H2. 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 750°C to ensure suitable microstructure and adhesion of both film electrodes with the electrolyte.