| 摘要 |
PURPOSE:To prevent coming off during long term operation and continue steady output by forming a water repellent layer of electrode in a specified two layer structure. CONSTITUTION:A catalyst layer 4 and a water repellent layer 5 are bonded together, and on the opposite side of bonding layer, the catalyst layer 4 is in contact with electrolyte and the water repellent layer 5 is in contact with fuel gas or oxidizing agent gas. The water repellent layer 4 comprises two layers of the first layer 5a which is in contact with the catalyst layer 4 and made of the mixture of carbon particles and fluorine resin, and the second layer 5b which is bonded to the first layer 5a and is in contact with fuel gas or oxidizing agent gas on the opposite side and made of the mixture of metal particles and fluorine resin. For example, the water repellent layer 5a is formed in a thin film with the mixture of acetylene black and polytetrafluoroethylene resin and the water repellent layer 5b is formed in a thin film with the mixture of carbonyl nickel powder and polytetrafluoroethylene resin. The catalyst layer 4, water repellent layers 5a, 5b are stacked and hot-pressed to bond together. |
