Comparison of Sr-doped and Sr-free La1−xSrxMn0.5Cr0.5O3±δ SOFC Anodes
Abstract Single phase La 1  −  x S r x Mn 0.5 Cr 0.5 O 3 ±  δ (LSMC, x Sr  = 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 La 1  −  x S r x Mn 0.5 Cr 0.5 O 3 ±  δ improves both the thermo-chemical stability and the electronic conductivity of these materials in a humidified H 2 environment, while also enhancing their H 2 oxidation activity, when operating at 700 and 800 °C. It is also shown that the addition of 50:50 wt.% GDC:LaMn 0.5 Cr 0.5 O 3 ±  δ results in the retention of all of these benefits, as compared to a mixture of GDC with the Sr-containing La 0.8 Sr 0.2 Mn 0.5 Cr 0.5 O 3 ±  δ ( x Sr  = 0.2) oxide.