Molybdenum substitution at the B-site of lanthanum strontium titanate anodes for solid oxide fuel cells

The effects of Mo doping into the B-site of La 0.3 Sr 0.7 TiO 3-δ perovskite on its ionic conductivity and catalytic activity as an anode material of solid oxide fuel cells have been investigated. The partial substitution of Ti by Mo reduces the bond energy between metal and oxygen ions in the perovskite. The concentration of Mo 5+ /Mo 6+ redox couples increases with the rise of the content of Mo, while the oxygen ionic conductivity decreases simultaneously. The doping of Mo significantly reduces the anodic polarization resistance and improves the performance of the single cell. The cell with La 0.3 Sr 0.7 Ti 0.97 Mo 0.03 O 3-δ anode and La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ electrolyte exhibits a maximum power density of 135 mW cm −2 at 850 °C with hydrogen as fuel.