Method for manufacturing membrane-electrode assembly for polymer electrolyte fuel cell and membrane-electrode assembly manufactured thereby

摘要

The present invention provides a method for manufacturing a membrane-electrode assembly for a polymer electrolyte fuel cell, in which the glass transition temperature of an electrolyte membrane is reduced using a hydrophilic solvent, and a membrane-electrode assembly for a polymer electrolyte fuel cell, manufactured by the method. In the method of the invention, the glass transition temperature of the electrolyte membrane to which a catalyst is transferred is reduced compared to that in a conventional method for manufacturing a membrane-electrode assembly for a polymer electrolyte fuel cell using the decal process. Thus, even to an electrolyte membrane material having a relatively high glass transition temperature, the catalyst may be transferred at a rate of 100% at a temperature of about 120° C., at which hot pressing is carried out. Thus, the problems associated with electrolyte membrane deterioration occurring in conventional methods can be solved.

主权项

1. A manufacturing method for producing a membrane-electrode assembly for a polymer electrolyte fuel cell, the method comprising the steps of:
(1) applying a catalyst slurry to a release film, said catalyst slurry composed of a mixture of a catalyst, a hydrogen ion conductive polymer and a dispersion medium, and drying the applied catalyst slurry, thereby forming a catalyst layer; (2) laminating the catalyst formed on the release film on both sides of an electrolyte membrane in such a manner that the catalyst layer faces the electrolyte membrane, wherein the electrolyte membrane is a polymer film made by a hydrocarbon polymer selected from the group consisting of sulfonated polysulfone, sulfonated polyethersulfone, sulfonated poly ether ketone, sulfonated poly ether ether ketone, sulfonated poly arylene ether ether ketone, sulfonated poly arylene ether sulfone, sulfonated poly arylene ether benzimidazole and partially fluorinated ion conductor, and wherein the electrolyte membrane is coated by hydrophilic solvent with an amount of 100-1000 mg of solvent per cm3 of the electrolyte membrane; and (3) hot-pressing the laminate to transfer the catalyst layer to the electrolyte membrane.