Y0.08Sr0.92FexTi1-xO3-perovskite for solid oxide fuel cell anodes

Abstract: A single phase perovskite Y0.08Sr0.92FexTi1-xO3- (x=0.05, 0.1, 0.2, 0.25, 0.4, and 0.5) was fabricated at 1400C in air by a solid state reaction method and its electrical conductivity and electrochemical properties as an anode were investigated as a function of the Fe content. Doping with Y for Sr allowed the SrFexTi1-xO3- perovskite to be stable at 800C in a reducing atmosphere. At 900C, metallic Fe precipitated and the stability of the perovskite phase under a reducing atmosphere decreased as the Fe content increased. The conductivity of Y0.08Sr0.92FexTi1- xO3- (x=0.4) was greater than that of the x=0.2 sample. The conductivity of Y0.08Sr0.92FexTi1- xO3- was found to be 2⊥10-1 Scm-1 at 800C in H2. Sintering the Y0.08Sr0.92FexTi1-xO3- anode at 1200C was found to be optimum to obtain not only good interfacial adhesion, but also a fine grain structure. The Y0.08Sr0.92Fe0.25Ti0.75O3- anode exhibited the lowest polarization resistance (0.7 and 1.8 cm2 at 800 and 700C).