| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrode for solid polymer type fuel cells which can durably retain a sufficient water repelling property by coating the surface of fine pores of a porous gas diffusion electrode with a specified solvent-soluble fluorine-containing polymer. SOLUTION: This porous gas diffusion electrode consists of a catalytic powder and an ion-exchange resin and a fluorine-containing polymer produced by using a solution of a solvent soluble fluorine-containing polymer having practically no ion-exchange group (for example, sulfonic acid group, carboxylic acid group, etc.) exists in at least a part of the surface of fine pores of the electrode. The existing amount of the fluorine containing polymer in the porous electrode is preferably 0.01-30wt.%. As the fluorine-containing polymer, perfluorocarbon polymers having an aliphatic ring structure are preferable. Non-acrylic type partially fluorinated polymers are among other examples.
|
