To provide a membrane electrode assembly suppressing plastic deformation and damages of a porous diffusion layer.
The membrane electrode assembly comprises a solid high polymer electrolyte membrane 2 held by a catalyst layer 3, 4 of an electrode 7, 8. The catalyst layer 3, 4 is located inside the peripheral edge of the solid high polymer electrolyte membrane 2. One surface of the solid high polymer electrolyte membrane 2 is covered by the catalyst layer 4 and an adhesive supporting layer 9. The catalyst layer 4 and the adhesive supporting layer 9 are covered by the porous diffusion layer 6. The adhesive supporting layer 9 is penetrated and integrated into the porous diffusion layer 6. The adhesive supporting layer 9 is made of adhesive material which is penetrated into the porous diffusion layer 6 with 30-100% packing density to the open part of the porous diffusion layer 6. The peripheral edge of the catalyst 3, 4 is located in a part different from the peripheral edge of the catalyst 4, 3, opposing each other across the solid high polymer electrolyte membrane 2. The peripheral edge of the catalyst 3, 4 is located inside the peripheral edge of the catalyst layer 4, 3.
NANAUMI MASAAKI
MITSUDA NAOKI
Takehiro Chiba
Next Patent: STORAGE BATTERY VENTILATION STRUCTURE