The performance of anode-supported SOFC’s utilizing a Mn-containing ferritic stainless steel (Crofer22 APU) as the cathode current collector were assessed. Three cathodes were considered: (La0.8Sr0.2)0.99MnO3, (La0.8Sr0.2)0.99FeO3and (La0.6Sr0.4)0.98Fe0.8C00.2O3 (all samples incorporated a Sm-doped CeO2 interlayer between the cathode and the thin film YSZ electrolyte). Inclusion of the Fe-Cr alloy caused rapid degradation in all samples, which was attributed to solid-state reactivity at the cathode-Crofer interface, in addition to Cr volatilization from the alloy and subsequent condensation/reaction within the cathode and at the cathode-electrolyte interface. In situ- HTXRD was used to access the cathode-Crofer reaction products. Pre-oxidation of the Crofer at 800 degrees C for 500 hours to form a protective (Mn,Cr)3O4 spinel coating resulted in a marginal reduction of the cell degradation rate.
Revised: June 23, 2011 |
Published: April 1, 2005
Citation
Simner S.P., M.D. Anderson, G. Xia, Z. Yang, L.R. Pederson, and J.W. Stevenson. 2005.SOFC Performance with Fe-Cr-Mn Alloy Interconnect.Journal of the Electrochemical Society 152, no. 4:A740-A745.PNNL-SA-42784.