| 摘要 |
PURPOSE:To improve the current-voltage characteristics and life characteristics by forming an electrode catalyst layer in which fluorine resin grains of a small grain size is used and an electrode catalyst layer consisting of fluorine resin grains of a large grain size. CONSTITUTION:A gas diffusion electrode for a fuel cell consists of a catalyst carrier 7, rare metal grains, fluorine resin grains 8A, 8B, and an electrode base material 1, where the carrier 7 is carbon black powder, so the rare metal grains are carried on the carrier 7. An electrode catalyst layer 2 is which the grain 8A of smaller grain size are used and an electrode catalyst layer 3 consisting of the grains 8B of larger grain size are formed. In this constitution, because the grain size of the fluorine resin grains is small, water repellency of phosphoric acid is large, and secular pore closing effect by phosphoric acid is eliminated, thereby the current-voltage characteristics and life characteristics can be improved. |
