| 摘要 |
Disclosed is a fuel cell comprising an membrane electrode assembly (1) wherein the porosity of a hydrogen electrode-side catalyst layer (11a) is lower than the porosity of an air electrode-side catalyst layer (11b). Specifically, the weight ratio of the ion-exchange resin to the carbon carrier in the hydrogen electrode-side catalyst layer is made higher than such a weight ratio in the air electrode-side catalyst layer; or an additive having a particle diameter of a certain value or less is contained in the hydrogen electrode-side catalyst layer; or the hydrogen electrode-side catalyst layer is formed by spraying a catalyst ink, while the air electrode-side catalyst layer is formed by a transfer method. By having such a constitution, the amount of hydrogen transmitted from the hydrogen electrode-side catalyst layer to the air electrode-side catalyst layer via the electrolyte membrane can be reduced, so that direct combustion reaction of hydrogen at the air electrode-side catalyst layer is suppressed, thereby improving durability of the fuel cell. |
