Chemical Compatibility of A-site Deficient La Substituted SrTiO3 Anode and Stabilized Zirconia Electrolyte

Tuesday, 28 July 2015
Hall 2 (Scottish Exhibition and Conference Centre)
G. Chen (Northeastern University, China), Y. Luo, Y. Gao (Northeastern University, China), R. Guo (Northeastern University, China), W. Ma (Northeastern University, China), M. Liu, and S. Geng (Northeastern University, China)
Rapid performance degradation occurred during the initial stage of the cells test with (La0.25Sr0.75)0.9TiO3(LST-0.9)/ScSZ composite anode and (La0.25Sr0.75)0.85(LST-0.85)TiO3/ScSZ composite anode, respectively, has been reported in previous study. Diffusion of Zr and Sc from ScSZ into LST-0.9 and Ti from LST-0.85 into ScSZ occurred during anode preparation processes and the performance tests were respectively considered as dominant degradation mechanism for the cells with LST-0.9/ScSZ anode and LST-0.85/ScSZ anode. Based on this, a LST with A-site deficiency between LST-0.85 and LST-0.9 possess chemical stability with ScSZ at elevated temperature might be existed. In this study, series A-site deficient (La0.25Sr0.75)xTiO3 (x varies from 0.89 to 0.86) were prepared by sol-gel method to develop A-site deficient LST with better chemical compatibility with ScSZ. Chemical stability between as-prepared A-site deficient LST with ScSZ and long term stability of LST-x/ScSZ composite anode were investigated.