The long-term stability of anode-supported YSZ electrolyte SOFCs utilizing (La0.6Sr0.4)0.98Co0.2Fe0.8O3-? (LSCF-6428) cathodes was assessed. Samples tested for 500 hours at 750ºC and 0.7V indicated ˜50% degradation. While scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) analysis indicated no obvious microstructural or chemical phenomena that could explain the high degradation, x-ray photon spectroscopy (XPS) revealed that enrichment of Sr at the cathode-electrolyte and cathode-current collector interfaces was at least partially responsible for the observed degradation.
Revised: September 5, 2006 |
Published: August 17, 2006
Citation
Simner S.P., M.D. Anderson, M.H. Engelhard, and J.W. Stevenson. 2006.Degradation Mechanisms of La-Sr-Co-Fe-O3 SOFC Cathodes.Electrochemical and Solid-State Letters 9, no. 10:A478-A481.PNNL-SA-49777.