Influence of Additive Oxides on Electrochemical Performance of Y-doped SrTiO3 Anode in SOFCs

A composite anode consisting of Y-doped SrTiO3 (YST) as an electron conducting phase with ceramic oxides is currently a promising candidate to overcome the shortcomings of Ni-based anode. The composite anodes with various additive oxides such as samaria-doped ceria (SDC), yttria-stabilized zirconia (YSZ), and scandia-stabilized zirconia (ScCeSZ) were prepared to evaluate the electrocatalytic performance in both hydrogen and methane fuels. The composite of YST-SDC showed excellent performance among all composites investigated due to superior catalytic activity of SDC towards oxidation of fuels. Moreover, the addition of some portions of nickel in anode composite could remarkably enhance the electrochemical performance of the anode. By 10 wt % nickel oxide loading, the composite showed significantly increased performance in humidified hydrogen and methane without degradation over 20 h