| 摘要 |
PURPOSE:To eliminate the possibility of voltage outputs being abruptly decreased so as to enhance the output performance of a fuel cell when the fuel cell is formed by junction of an ion exchange film serving as electrolyte and gas diffusion electrodes each having at least a catalyst layer by impregnating the catalyst layer with a proton conductive material, and specifying the percentage of voids in the catalytic layer after the junction. CONSTITUTION:An ion exchange film for use as electrolyte contains a fluorine- containing polymer that serves as its skeleton, containing at least one kind of group selected from a sulfonate group, a carboxyl group, a phosphate group and a phosphate group. Gas diffusion electrodes are each provided with a porous catalyst layer having a conductive material as an essential constituent with at least catalytic metal particles supported thereto, and a water repelling agent and a binding agent are contained therein when necessary. Any catalytic metal that works in hydrogen oxidation and oxygen reduction, such as lead, iron and manganese is usable and a proton conductive material is contained in the metal and the percentage of voids formed in the catalyst layer after junction is 65 to 90. Thus a sufficient amount of reaction gas is supplied to reaction interfaces. |
