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

Abstract

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.