METHOD FOR PREPARING SLURRY FOR FORMING CATALYTIC LAYER OF PROTON EXCHANGE MEMBRANE(PEM) FUEL CELL TO AVOID PROBLEM CAUSED BY RESIDUAL ALCOHOL, METHOD FOR MANUFACTURING PEM FUEL CELL USING THE SAME AND PEM FUEL CELL OBTAINED THEREBY

摘要

PURPOSE: A method for preparing slurry for forming a catalytic layer of a PEM fuel cell is provided to avoid the problems caused by residual alcohol, including degradation of catalyst availability, and to give a PEM fuel cell having a high Pt loading amount. CONSTITUTION: The method for preparing slurry for forming a catalytic layer of a PEM fuel cell comprises the steps of: (a) adding an aqueous MOH (wherein M is an alkali metal such as Li, Na and K) to the solution of perfluorosulfonate ionomer(PFSI) to convert the PFSI in the solution into the M+ form; (b) adding a polar organic solvent having a boiling point higher than that of the residual alcohol in the PFSI solution and heating the mixture at a temperature from the boiling point of the alcohol to the boiling point+20 deg.C to remove the residual alcohol, thereby providing pretreated PFSI solution; and (c) mixing the pretreated PFSI solution with Pt/Carbon powder to form the slurry.