ABSTRACT
Porous electrode support tubes of La0.6Sr0.4MnO3 and Ni-YSZ (yttria-stabilized zirconia) cermet were fabricated by slip casting method. Microstructures of these supports could be controlled by sintering temperature, particle size of powders, and additives. Thin film of YSZ was deposited onto the porous Ni-YSZ cermet supports by slurry coating method. The dense film of YSZ was obtained by repeating the slurry coating and sintering cycles. The H2-O2 fuel cell attained 1.05V of open circuit voltage. The fuel cell with La0.7Ca0.35Cr0.95O3 interconnector was fabricated by plasma spraying method. Electrochemical and catalytic activities of fuel electrode have been evaluated as a preliminary study of internal reforming of natural gas. The anodic reaction on Ni-YSZ appears to be limited by the activation step of oxide ion in the electrolyte under H2-H2O, CO-CO2, and CH4-H2O atmospheres near the open circuit condition. On the other hand, the kind of fuel strongly affected the polarization conductivity of Pt anode.
