MEMBRANE FOR SOLID POLYMER ELECTROLYTE FUEL BATTERY/ELECTRODE ASSEMBLY, PROCESS FOR PRODUCING SAID MEMBRANE/ELECTRODE ASSEMBLY, AND SOLID POLYMER ELECTROLYTE FUEL BATTERY USING SAID MEMBRANE/ELECTRODE ASSEMBLY

摘要

This invention provides a solid polymer electrolyte fuel battery that can improve battery power output through an improvement in catalyst particles in a catalyst layer in a membrane/electrode assembly. In a membrane/electrode assembly for a solid polymer electrolyte fuel battery, comprising a solid polymer electrolyte membrane and a catalyst layer and a gas diffusion layer each provided on both sides of the solid polymer electrolyte membrane, the cathode-side catalyst layer is formed of catalyst particle lumps formed by disposing Pt catalyst particles on the surface of a forming assistant of acid-resistant particles of micron order to cover the surface. A gap large enough to allow a reaction gas to smoothly flow into between catalyst particle lumps of micron order can be ensured to improve the battery power output.