Research and development of fuel cells using high temperature proton conductors

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Thin-film electrolyte fuel cells are fabricated using strontium-zirconate-cerate solid solution whic h has both chemical stability and fairly high proton conductivity. When the film was prepared by pul sed-laser deposition method, the fuel cells thus fabricated showed high performance in the operation al temperature range of 500-700 degree C. Samarium-strontium cobaltate that have shown high cathode performance with barium cerate electrolyte was found to work well for the solid solution electrolyte.Slurry coating was tested for fabrication of thin film electrolyte, intending the use for industria 1 process. Cobalt was found to work as a sintering aid, where as the resulting electrolyte shoed ten times lower conductivity than the undoped material. On the other hand, the mixture of starting mate rial (i. e., carbonates and oxides) can become well-sintered thin film when it backed without taking the course of calcinations. Thin film thus fabricated was confirmed to work for fuel cells.In the investigation in this project, fabrication route of proton conductor fuel cells can be establ ished.