Catalytic Activities and Electrochemical Properties of Y and Fe Co-Doped SrTiO_3 Based Composite Anodes for Solid Oxide Fuel Cells (SOFCs)

摘要

In this study, fine Y and Fe co-doped SrTiO_3 powders were synthesized via solid state reaction and Pechini method. Perovskite-based anodes were proposed to enhance the anode performance. Doping with Y for Sr allows Y_(0.08)Sr_(0.92)Fe_xTi_(1-x)O_(3-δ) perovskite to be stable at 800°C in a reducing atmosphere. Sintering the oxide anode at 1200°C is found to be optimum to obtain not only good interfacial adhesion, but also a fine grain structure. The Y_(0.08)Sr_(0.92)Fe_(0.25)Ti_(0.75)O_(3-δ) anode, which is sintered at 1200°C, showed the lowest polarization resistance. Electrochemical properties and catalytic activity for CH_4 oxidation of the composite anode were investigated by gas chromatography and ac-impedance spectroscopy.