Ni-doped Sr₂Fe_1.5Mo_0.5O₆ as Anode Materials for Solid Oxide Fuel Cells

10% Ni-doped Sr₂Fe_1.5Mo_0.5O₆ is prepared and A-site deficiency is introduced to induce in situ precipitation of B-site metals under anode conditions. XRD, SEM and TEM results show that a significant amount of Ni-Fe alloy metal phase has precipitated out from Sr_1.9Fe_1.4Ni_0.1Mo_0.5O₆ upon reduction at 800^oC in wet H₂. Conductivity of the reduced composite reaches 29 S cm^-1 at 800 ^oC in wet H₂. Fuel cell performance of the composite anode Sr_1.9Fe_1.4Ni_0.1Mo_0.5O₆-SDC is further investigated in H₂. The peak power density reaches 968 mW cm^-2 at 800 ^oC and the voltage is relatively stable under a constant current load of 0.54 A cm^-2 for 150h. The fuel cell performance can also be regenerated after the anode is exposed to air. After 5 redox cycles, the fuel cell performance is even increased, indicating good redox stability of Sr_1.9Fe_1.4Ni_0.1Mo_0.5O₆. The composite anode also shows reasonable performance when propane was used as fuel.