| 摘要 |
PURPOSE:To enhance characteristics of a cell by using a cross-linked perfluorocarbon polymer as a partition film. CONSTITUTION:A gas diffusion electrode is brought into close contact with a film of a sulfonic acid type perfluorocarbon polymer by a general method, to be held between current collectors, thus obtaining a fuel cell. The gas diffusion electrode is generally made of a porous sheet of conductive carbon black powder, which carries a platinum catalyst particle, held by a hydrophobic resin binder such as a PTFE, and it may include a sulfonic acid type perfluorocarbon polymer or a particle covered with the polymer. The gas diffusion electrode is brought into close contact with the polymer by a heating/pressing method or the like. A solution or dispersing liquid of the polymer is previously applied to the gas diffusion electrode, thereby enhancing adhesiveness between the electrode and the film. A groove serving as a passage for fuel gas or oxidant gas is formed on the current collector, which is made of a conductive carbon plate or the like. Consequently, it is possible to improve mechanical strength of the film owing to cross-linking, reduce a thickness of the film, reduce an ohmic loss, and enhance characteristics of the cell. |
