Fabrication of BaCe0.8Y0.2O3 dense film on perovskite-type oxide electrode substrates

The electrochemical performances were investigated for proton-conducting solid oxide fuel cells (SOFCs) with the perovskite-type oxide cathodes. As for proton-conducting SOFC using BaCe0.8Y0.2O3 (BCYO) and SrCe0.95Yb0.05O3 (SCYO) electrolytes, La0.7Sr0.3FeO3 (LSFO) cathode showed the best electrochemical performance among the perovskite-type oxides tested in the present study. The spin-coating technique was applied to fabricate BCYO thin film on the LSFO substrate. With this technique, dense and crack-free BCYO thin film could be fabricated on LSFO electrode substrate. However, the electrical conductivity of BCYO thin film fabricated on LSFO electrode substrate was lower than that of the bulk BCYO specimen, suggesting the formation of the second phase between the electrolyte film and the oxide substrate.