Method of manufacturing catalyst slurry for fuel cells and method of manufacturing electrode for fuel cells using the same

A method of manufacturing catalyst slurry for fuel cells, the method comprising:

• preparing a catalyst comprising a porous carrier and catalyst metal;
• introducing the catalyst, a solvent, and an ionomer into a chamber;
• and
• infiltrating the ionomer into pores of the carrier;
• wherein the carrier comprises pores depressed inward from an outer surface of the carrier, the pores comprising a plurality of pore inlets each having an average diameter of 5 nm to 30 nm;
• wherein the ionomer comprises a polymer having a radius of gyration of a polymer chain of 5 nm or less;
• wherein the infiltrating of the ionomer into pores of the carrier comprises stirring contents of the chamber while applying heat and pressure thereto;
• wherein a temperature of the contents of the chamber is increased to 25° C. to 80° C.;
• and
• wherein the pressure applied to the contents of the chamber is 2 bar to 200 bar.