| 摘要 |
A membrane electrode assembly which includes an anode, a cathode and a solid polymer electrolyte membrane that are specifically arranged, wherein the cathode has a cathode catalyst layer and a cathode diffusion layer that is arranged on a surface of the cathode catalyst layer, the surface being on the side opposite the solid polymer electrolyte membrane side, the cathode catalyst layer contains an oxygen reduction catalyst composed of composite particles each of which is constituted of a catalyst metal containing palladium or a palladium alloy and a catalyst carrier containing, as constituent elements, a specific transition metal element M1, a transition metal element M2 other than the transition metal element M1, carbon, nitrogen and oxygen in a specific ratio, and the cathode diffusion layer contains an oxidation catalyst and a water-repellent resin. |
| 主权项 |
1. A membrane electrode assembly comprising an anode, a cathode and a solid polymer electrolyte membrane and having constitution in which the solid polymer electrolyte membrane is interposed between the anode and the cathode, wherein
the cathode has a cathode catalyst layer and a cathode diffusion layer that is arranged on a surface of the cathode catalyst layer, said surface being on the opposite side to the solid polymer electrolyte membrane side, the cathode catalyst layer contains an oxygen reduction catalyst composed of composite particles each of which is constituted of a catalyst metal and a catalyst carrier, the catalyst metal contains palladium or a palladium alloy, the catalyst carrier contains, as constituent elements, a transition metal element M1 that is at least one selected from the group consisting of titanium, zirconium, niobium and tantalum, a transition metal element M2 other than the transition metal element M1, carbon, nitrogen, and oxygen, the ratio of the number of atoms among the transition metal element M1, the transition metal element M2, carbon, nitrogen and oxygen (transition metal element M1:transition metal element M2:carbon:nitrogen:oxygen) is (1-a):a:x:y:z (with the proviso that a, x, y and z are numbers of 0<a≦0.5, 0<x≦7, 0<y≦2 and 0<z≦3), and the cathode diffusion layer contains an oxidation catalyst and a water-repellent resin. |
