High Temperature Solid Electrolyte Fuel Cells Using Perovskite‐Type Oxide Based on BaCeO3

Using perovskite‐type oxide based on as a solid electrolyte, small‐size high‐temperature fuel cells were constructed and cell performances were examined. The Nd‐doped ceramic electrolyte exhibited a mixed conduction of proton and oxide ion. Mixtures of water vapor and some gases such as methanol vapor or methane were used as a fuel by internal reforming to liberate hydrogen in the anode compartment. These fuel cells worked stably above 900°C. At 1000°C, the overvoltage at both electrodes was very small and the performances of the cells were limited mainly by ohmic resistance of the solid electrolyte. Besides platinum, porous nickel was a promising anode material for this electrolyte.