| 摘要 |
PURPOSE:To prevent the deterioration of the cell characteristics during a discharge for a long time by forming an air electrode with a double-structure catalyst layer consisting of a silver carrying catalyst layer arranged on the electrolyte side and a platinum carrying catalyst layer arranged on the gas side. CONSTITUTION:A catalyst layer 2 on the electrolyte A side is made a silver carrying catalyst layer, a catalyst layer 3 arranged inside on the gas B side is made a catalyst layer carrying platinum or palladium, an electrode substrate 5 made with a water-repellent layer 4 of a polyethylene tetrafluoride film and carbon fibers is overlapped on them, and they are pressed and bound to form an air electrode used for a fuel cell or an air cell. Accordingly, during the initial period of the discharge, the silver catalyst layer 2 contributes to the reaction, and when the electrolyte A infiltrates into the catalyst layer during the discharge for a long time, the catalyst layer 3 of platinum, etc. starts to contribute to the reaction, thus they maintain catalyst activities in respective catalyst layer regions depending on the infiltration depth, and a stable operation for a long time can be obtained. |
