Solid oxide fuel cells based on proton conducting electrolytes

We have fabricated a solid oxide fuel cell (SOFC) using BaCe0.8Y0.2Ox (BCY) proton conductor as the electrolyte. An approximate to 15-mu m-thick dense BCY film was prepared on a porous Ni/BCY cermet (i.e., ceramic/metal composite) substrate by a colloidal spray deposition technique. The gas-permeable Ni/BCY cermet substrate backed with nickel mesh was used as the anode, and a platinum paste backed with platinum mesh served as the cathode. The current-voltage characteristics of the BCY-based SOFC were measured in the temperature range 600-800 degrees C using wet air on the cathode side and wet hydrogen on the anode side. The open-circuit voltage was close to the theoretical value at all operating temperatures. The power density of the fuel cell was approximate to 240 and approximate to 875 mW/cm(2) at 600 and 800 degrees C, respectively.