Patent ID: 7455703

Claim:
A method for manufacturing a polymer electrolyte fuel cell, comprising the steps of (i) adsorbing a first polymer electrolyte to first carbon particles supporting a catalyst in a first dispersion in which said first polymer electrolyte is dispersed; (ii) adsorbing a second polymer electrolyte to second carbon particles supporting a catalyst in a second dispersion in which said second polymer electrolyte is dispersed, wherein said first and said second polymer electrolytes may be the same or different; (iii) preparing a catalyst layer ink by mixing said first and second dispersions; and (iv) forming a catalyst layer from said catalyst layer ink; and further comprising the step of (v) adjusting a particle size of at least one of said first and second polymer electrolytes by mixing a first solvent in which said polymer electrolyte is dispersed with a second solvent having a dielectric constant different from that of said first solvent before adsorbing said polymer electrolyte to said carbon particles in at least one of said first and second dispersions.