ELECTROLYTE MEMBRANE ELECTRODE ASSEMBLY USING POLYMER ELECTROLYTE MEMBRANE CONTAINING POLYMER HAVING CO-CATALYST FUNCTION, PREPARATION METHOD THEREOF AND DIRECT SOLID POLYMER-TYPE FUEL CELL USING THE ASSEMBLY

摘要

PURPOSE: An electrolyte membrane electrode assembly, its preparation method and a direct solid polymer-type fuel cell using the assembly are provided, to inhibit crossover, to prevent the decrease of output due to crossover, and to improve response in case of the change of output. CONSTITUTION: The electrolyte membrane electrode assembly uses a polymer electrolyte membrane containing a polymer having a co-catalyst function at the surface environment. Preferably the polymer constituting the polymer electrolyte membrane has an anionic group and the polymer having a co-catalyst function is first formed at the environment of the anionic group. The method comprises the steps of dipping a polymer electrolyte membrane in an oxidant or a liquid containing an oxidant, and a monomer capable of generating the polymer having a co-catalyst function or a liquid containing the monomer in turn; polymerizing the monomer to form a polymer having a co-catalyst function on the surface environment of the polymer electrolyte membrane; and adhering the obtained one to an electrode.