Patent ID: 8133633

Claim:
A cathode electrode structure that contacts an electrolyte membrane and comprises a catalyst layer, a diffusion layer, and a electrode supporting layer sequentially stacked, wherein: the catalyst layer is formed by mixing a carbon material with a catalyst material and a hydrophilic ion conductive material, the hydrophilic ion conductive material is located across the catalyst layer along a thickness direction of the catalyst layer and contacts the electrolyte membrane and the diffusion layer to provide a migration path for water and hydrogen ions, and the hydrophilic ion conductive material is formed of one selected from the group consisting of phosphate doped by SnP 2 O 7 , a NH 4 PO 3 /TiP 2 O 7 composite, phosphate derived-hydrogel, phosphosilicate gel-polyimide composite, Zr tricarboxybutyl-phosphate/polyimide composite, phosphosilicate gel-polyimide composite, solid acid Cs 5 H 3 (SO 4 ) 4 , and hetero-acid H 3 PW 12 O 40 /poly styrene sulfonic acids (PSS).