Ni-doped Sr₂Fe_1.5Mo_0.5O_6-δas Anode Materials for Solid Oxide Fuel Cells

10% Ni-doped Sr 2 Fe 1.5 Mo 0.5 O 6-δ with A-site deficiency is prepared to induce in situ precipitation of B-site metals under anode conditions in solid oxide fuel cells. XRD, SEM and TEM results show that a significant amount of nano-sized Ni-Fe alloy metal phase has precipitated out from Sr 1.9 Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ upon reduction at 800°C in H 2 . The conductivity of the reduced composite reaches 29 S cm −1 at 800°C in H 2 . Furthermore, fuel cell performance of the composite anode Sr 1.9 Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ -SDC is investigated using H 2 as fuel and ambient air as oxidant with La 0.8 Sr 0.2 Ga 0.87 Mg 0.13 O 3 electrolyte and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 cathode. The cell peak power density reaches 968 mW cm −2 at 800°C and the voltage is relatively stable under a constant current load of 0.54 A cm −2 . After 5 redox cycles of the anode at 800°C, the fuel cell performance doesn't suffer any degradation, indicating good redox stability of Sr 1.9 Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ . Peak power density of 227 mW cm −2 was also obtained when propane is used as fuel. These results indicate that a self-generated metal-ceramic composite can been successfully derived from Sr 2 Fe 1.5 Mo 0.5 O 6-δ by compositional modifications and Sr 1.9 Fe 1.4 Ni 0.1 Mo 0.5 O 6-δ is a very promising solid oxide fuel cell anode material with enhanced catalytic activity and inherited good redox stability from the parent ceramic material.