抄録
A Ni-samaria-doped ceria (SDC) anode was employed in direct electrochemical oxidation of methane in a solid oxide fuel cell with yttria-stabilized zircoma (YSZ) as electrolyte to seek insights into the anodic properties and electrocatalytic activities of the anode. Compared with Ni-YSZ, the Ni-SDC anode exhibited higher open-circuit voltages and lower degree of polarization. The anodic polarization of Ni-SDC was shown to result from the effect of concentration polarization. The effects of nickel content in Ni-SDC on the performance and microstructure of the anode were studied. It was found that the anodic polarization and electrocatalytic activities strongly depended on the Ni content in the anode, and the optimized results were achieved with the anode of 60 wt% Ni content. The high performance of the Ni-SDC anode containing 60 wt% Ni appears to be attributable to the microstructure formed. In addition, the Ni-SDC anode at this Ni content was found to be stable in methane environments.
