A series of perovskites, La1-xSrxCr1-xFexO3-d (x = 0.2, 0.3, 0.4, 0.5, 0.67, LSCrFe), were investigated as solid oxide fuel cell (SOFC) anodes. The perovskites were tested in full cells with La0.9Sr0.1Ga0.8Mg0.2O3-e / La0.4Ce0.6O2 bi-layer electrolytes as both single phase LSCrFe and LSCrFe�Gd0.1Ce0.9O2-� (GDC) composite anodes. The anodes were more stable compared to more Fe-rich compositions examined in prior reports and yielded polarization resistances significantly lower than those reported for Fe-free anodes like La1-xSrxCrO3-d. Lower polarization resistances were observed for anodes with higher Fe contents. At 800�C the x = 0.67 perovskite anodes achieved the lowest resistances of 0.275 ?�cm2 for LSCrFe and 0.333 O�cm2 for LSCrFe-GDC in humidified H2. Oxygen loss by these perovskites, which improves ionic conductivity, accounts for the decreases in polarization resistance with increasing Fe content. Anode performance can thus be enhanced and optimized by substituting intermediate concentrations of Fe and Sr into the perovskite.

Stable perovskite oxides with low solid oxide fuel cell anode polarization resistance: La1-xSrxCr1-xFexO3-d (x = 0.2 � 0.67)

248th National Meeting (2014)

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