| 摘要 |
PURPOSE:To get a gas diffusion electrode, which shows high electromotive force, by junctioning the anode ion exchange film of a copolymer, which has a specified structure of parfluorosulfonic group, with an electrode catalyst layer, selecting the specified thickness and specified ion exchange capacity. CONSTITUTION:An anode ion exchange film 1 of specified thickness and specified quantity of exchanged ions at room temperature in dry condition is made. The structure is shown in formulae I and II. But, x is Na or K, k is 2.1-7.4, m is 3.8-9.1, and l and m are positive numbers. This exchange film consists of tetrafluoroethylene units and parfluorovinyl ether units having sulfonic groups at the side chain. In advance, C fine particles covered with Pt catalysts and the same one as a copolymer are mixed with the solution mainly composed of low-class alcohol, and it is applied on the exchange film, and after removal of a solvent, it is bonded by heat compression at a temperature where the copolymer softens or less. It is processed with dilute sulfuric acid so as to change the whole sulfonic group. The gas diffusion electrode by this constitution exhibits high electromotive force. |
