Ni-Doped Sr2fe1.5mo0.5o6-Delta As Anode Materials For Solid Oxide Fuel Cells

10% Ni-doped Sr2Fe1.5Mo0.5O6-delta 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)Mc(0.5)O(6-delta) upon reduction at 800 degrees C in H-2. The conductivity of the reduced composite reaches 29 S cm(-1) at 800 degrees C in H-2. Furthermore, fuel cell performance of the composite anode Sr1.9Fe1.4Ni0.1Mo0.5O6-delta-SDC is investigated using H-2 as fuel and ambient air as oxidant with La0.8Sr0.2Ga0.87Mg0.13O3 electrolyte and La0.6Sr0.4Co0.2Fe0.8O3 cathode. The cell peak power density reaches 968 mW cm(-2) at 800 degrees 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 degrees C, the fuel cell performance doesn't suffer any degradation, indicating good redox stability of Sr1.9Fe1.4Ni0.1 Mo0.5O6-delta. 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 Sr2Fe1.5Mo0.5O6-delta by compositional modifications and Sr1.9Fe1.4Ni0.1Mo0.5O6-delta is a very promising solid oxide fuel cell anode material with enhanced catalytic activity and inherited good redox stability from the parent ceramic material. (C) 2014 The Electrochemical Society. All rights reserved.