| 摘要 |
PURPOSE:To reconcile the feed of fuel and the discharge of generated gas and prevent the deterioration of cell performance by providing strong and weak- water repellency portions on the fuel pole substrate. CONSTITUTION:The electrode substrate 21 of a fuel pole 2 is made of carbon fibers and is porous, conductive, and paper-like, and this electrode substrate 21 is water repellency-processed with a 10-30wet% suspension of ethylene tetrafluoride having an average grain size of 0.2-0.4mum. In this case, strong and weak- water repellency portions are provided on the electrode substrate 21. Fuel is repelled at the strong-water repellency portions (a) of the electrode substrate 21 and permeates the weak-water repellency portions (b) to reach a catalyst layer 22, and +ions and electrons are emitted by the electrochemical reaction via catalyst action. Accordingly, no fuel exists at the electrode substrate 21, thus the generated gas can permeate the electrode substrate 21 even if the gas pressure is low, and the feed of fuel and the discharge of the generated gas can be easily reconciled. |
