HIGH-TEMPERATURE FUEL-CELL WITH CERIA-YTTRIA SOLID ELECTROLYTE

The solid electrolyte of the system CeO//4-Y//2O//3 exhibited high ionic conductivity as well as almost unity ionic transference number at 600 degree -100 degree C. High current density and electrical power can be obtained from a (CeO//2)//0//. //9(YO//1//. //5)//0//. //1 fuel cell at 600 degree -800 degree C. La//0//. //6Sr//0//. //4CoO//3 was an excellent cathode as compared with Pt electrode. A thin film of stabilized zirconia coated by rf-sputtering is effective in protecting the anodic surface of ceria-yttria electrolyte from reduction with hydrogen. The open-circuit voltage of the fuel cell approached the theoretical value with this coating treatment.