SOLID OXIDE FUEL CELL AND ELECTRODE MATERIAL FOR FUEL REFORMER

PROBLEM TO BE SOLVED : To provide a solid oxide fuel cell capable of operating at a low temperature such as 400°C to 600°C. SOLUTION : All of boundary faces between Ag film and oxygen ion conductivity composition film function as the crawling field of oxygen as a cathode electrode or as the squirting field of oxygen ion as an anode electrode by making Ag having high electronic conductivity and oxygen permeability the cermet with high oxygen ion conductivity solid electrolyte. Anode characteristic is further improved by carrying Rh, Ru, Pd, Pt or precious metal fine powder of alloy made from them. In result, the problem of SOFC that it is difficult to start in a short time is solved since polarization resistance by electrode reaction is reduced, and SOFC can be made to be operational at a low temperature such as 400°C to 600°C. In addition, when it is used as the fuel reformer by an electrochemical partial oxidative reaction, hydrogen is produced and electric energy is also obtained. The quantity consumed of rare precious metals can be reduced by allowing miniaturization of the PEFC requiring rare Pt or Ru as the electrode material.