Synthesis and performance of Y-doped La0.7Sr0.3CrO3−δ as a potential anode material for solid oxygen fuel cells

Y-doped La0.7Sr0.3CrO3−δ is a promising anode catalyst for solid oxygen fuel cell (SOFC). The performances of chemical and physical are measured by SEM, XRD and FT-IR. The conductivities of catalyst are measured by DC four-probe method in 20% H2S–N2, 3% H2–N2 and air from 573 K to 1173 K, respectively. The results show that Y-doped La0.7Sr0.3CrO3−δ powders have perfect perovskite phase structure with no extra peaks and exhibit good chemical compatibility with Ce0.8Sm0.2O1.9 (as electrolyte) in air. Through XRD and FT-IR analysis no sulfur-containing species is detected after exposure to the 20% H2S at 1173 K for 5 h. Meanwhile, Y-doped La0.7Sr0.3CrO3−δ shows that the highest conductivity is 0.21 S/cm at 1173 K in H2S. The open circuit voltages are 0.85 V at 1173 K in H2S and 1.04 V at 823 K in H2. The maximal power densities are 12.4 mW/cm2 in H2S and 1.59 W/cm2 in H2 for cells comprising Y-doped La0.7Sr0.3CrO3−δ–Sm0.2Ce0.8O1.9/Sm0.2Ce0.8O1.9/Ag.