| 摘要 |
PURPOSE:To obtain a fuel cell having high capacity and long life by forming an electrode substrate of anode and/or cathode with a complex layer of porous conductors having different porosity. CONSTITUTION:An electrode 3 is a gas diffusion electrode, and an electrode substrate 30 consists of a coarse layer 30A and a dense layer 30B. A catalyst layer 4 obtained by bonding a carbon-supported noble metal catalyst with a binder of Teflon fine particles is fixed to the coarse layer 30B. Since the substrate layer 30A is relatively coarse, the catalyst layer is strongly fixed to the layer 30A to effectively form the catalyst layer 4. To form the substrate 30, relatively coarse carbon paper and relatively dense carbon paper are bound with a binder, or a two-layer structure of plastic fibers having different compositions is formed, then it is carbonized in a high temperature furnace. |
