Comparison of Sr-doped and Sr-free La1 − xSrxMn0.5Cr0.5O3 ± δ SOFC Anodes

Single phase La1 − xSrxMn0.5Cr0.5O3 ± δ (LSMC, xSr = 0 and 0.2) and composite LSMC:Gd-doped ceria (GDC) mixed ionic and electronic conducting anodes were studied in half-cell and full-cell electrochemical configurations using humidified fuel environments at 700 to 800 °C. We demonstrate here that the removal of Sr from La1 − xSrxMn0.5Cr0.5O3 ± δ improves both the thermo-chemical stability and the electronic conductivity of these materials in a humidified H2 environment, while also enhancing their H2 oxidation activity, when operating at 700 and 800 °C. It is also shown that the addition of 50:50 wt.% GDC:LaMn0.5Cr0.5O3 ± δ results in the retention of all of these benefits, as compared to a mixture of GDC with the Sr-containing La0.8Sr0.2Mn0.5Cr0.5O3 ± δ (xSr = 0.2) oxide.