MANUFACTURING METHOD FOR MEMBRANE ELECTRODE ASSEMBLY FOR SOLID POLYMER FUEL CELL

PROBLEM TO BE SOLVED: To provide a manufacturing method for a membrane electrode assembly for a solid polymer fuel cell capable of obtaining high output voltage by efficiently covering catalyst powder with a cation exchange resin to increase a reaction site in a three-phase zone. SOLUTION: This manufacturing method comprises a step preparing a coating solution with solid concentration of 0.1-20 mass% and positive (plus) zeta potential of the particles in the liquid by preparing a dispersion liquid by mixing a cation exchange resin and a dispersion medium containing alcohol, then warming at temperature of 40-120°C so that a zeta potential of the cation exchange resin in the dispersion liquid changes from negative (minus) to positive (plus), in that condition, adding and mixing catalyst powder into the dispersion liquid so that the mass ratio of the catalyst powder and the cation exchange resin in solid content conversion is 50:50-85:15, a step forming a catalyst layer by applying the coating solution on a base material and drying it and a step arranging the catalyst layer adjacent to a polymer electrolyte film as at least one catalyst layer of a cathode and an anode. COPYRIGHT: (C)2005,JPO&NCIPI