| 摘要 |
In an air-electrode-side catalyst layer of a fuel cell, the invention proposes a new method of preventing a polyelectrolyte material from being decomposed by radicals resulting from hydrogen that has permeated through an electrolyte membrane. According to the invention, the air-electrode-side catalyst layer is composed of a first catalyst layer on the side of the electrolyte membrane and a second catalyst layer on the side of a gas diffusion layer, and the first catalyst layer is lower in catalyst concentration than the second catalyst layer.
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