METHOD OF PREPARING CATALYST HAVING Pt-Pd DISPERSED POLYMER ELECTROLYTE MULTILAYERS TREATED WITH SULFURIC ACID

A method of preparing a catalyst having polymer electrolyte multilayers, comprising:

• a) sequentially forming a cationic polymer electrolyte layer and an anionic polymer electrolyte layer on an anionic support to form polymer electrolyte multilayers;
• b) treating the polymer electrolyte multilayers of step a) with sulfuric acid;
• and
• c) loading or inserting a Pt precursor and a Pd precursor into the polymer electrolyte multilayers treated with sulfuric acid in step b), and reducing the Pt precursor and the Pd precursor by a reductant to form Pt—Pd metal particles dispersed in the polymer electrolyte multilayers,
• wherein a Pt/Pd atomic ratio in the reduced Pt—Pd metal particles is 0.02 to 0.15.