| 摘要 |
PURPOSE:To achieve improved conductivity, gas permeability, catalytic ability, liquid leakage resistance and structural strength of a gas diffusion electrode by using as the electrode a cylindrical body consisting of sheet (A) and sheet (B) which are concentrically located in such a manner as to cause sheet (A) to touch air and sheet (B) to touch the liquid electrolyte. CONSTITUTION:Sheet (A) is prepared from a mixture composed of 50wt% active carbon fiber and 50wt% polytetrafluoroethylene fiber. A sheet with 1mm thick ness, which makes sheet (B) after sintering, is prepared by kneading a mixture composed of 50pts.wt. polyvinyl chloride, 50pts.wt. graphite, 20pts.wt. dioctyl phthalate, 2pts. a stearate and 60pts. methylethylketone until the methyl ethylketone is completely evaporated by using three rolls and then forming the kneaded mixture. After these sheets are pressed and fixed together, the thus formed sheet is rolled into a cylinder with 15mm diameter in such a manner as to locate the above sheet with 1mm thickness in the outer area of the cylinder.After that, the cylinder is heated in an atmosphere of nitrogen and then sintered in a sealed case, thereby making a gas diffusion electrode. This gas diffusion electrode has improved conductivity, gas permeability, cata lytic ability, liquid leakage resistance and structural strength. |
