Preparation and Properties of Cobalt-Doped Ceria(CDC) for IT-SOFCs Anodes in Natural Gas

Ce1-xCoxOy(x=0.10,0.15,0.20,0.25,0.30)(CDC) powders as the anode materials of intermediate temperature solid oxide fuel cells(IT-SOFCs) were prepared by sol-gel method.The NiO-CDC anode-supported cells were fabricated by dry-pressing process using Ce0.8Gd0.2O2-δ(GDC) as electrolyte and La0.8Sr0.2Co0.8Fe0.2O3-δ(LSCF)-Ce0.8Gd0.2O2-δ(GDC) as cathode.The crystal structure,morphology and chemical stability were investigated by XRD and SEM respectively.The performances of single cells were tested by using humidified natural gas(3% H2O) as fuel and oxygen as oxidant in the temperature range from 400℃ to 700℃.The results show that the anode of the cell has good open-framework;The 50%NiO-50%Ce0.8Co0.2Oy(C20C80)anode-supported cell shows the best electrochemical performance among the eight cells composed of different anodes.The maximum current density and power density are 148.84mA/cm2 and 30.91mW/cm2 tested at 650℃,respectively.