Solid Oxide Fuel Cell (SOFC) has many advantages over other fuel cell technologies such as a higher fuel-utility rate, a multiple fuel choice, and a higher tolerance to the fuel impurity. Ni based catalyst has been used as anode material for SOFC application because of its good electronic conductivity and high activity toward H2. Some Perovskite-type materials, such as La1-xSrxMnO3 and La1-xSrxCoyFe1-yO3 are efficiently used as cathodes of SOFCs. Herein, the La0.6Sr0.4Co0.2Fe0.8O3 ferrite based material has been prepared for anode material for SOFC.
La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) powder was produced by an ultra-sonic spray pyrolysis process. The Sm0.2Ce0.8O1.9 (SDC) powder was prepared by combustion method, and then pressed and polished to plane as electrolyte membrane. LSCF and SDC slurry with the ratio of 90:10(wt %) was sprayed onto both side of the electrolyte membrane and sintered at 1100 ºC for 2h. CH4 and mixed CH4/air gas stream were introduced into the quartz tube reactor at 500~800ºC. The OCV and powder density were tested with H2, CH4 as fuel.
The results indicate that the prepared LSCF powder consists mainly of spherical particles which have diameters of 0.5~3μm. The conductivity of the material is 300 S cm-1. When pure CH4 reacts on LSCF powder over 700ºC, More H2 than CO emits and nearly no CO2 is detected. It means coke deposits on the powder. At 700ºC the single cell can give an OCV about 0.9V and a maximum power density of 110mW/cm2 as the current density is 230mA/cm2.