| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm for alkaline water electrolysis, which is excellent in characteristics generally required for a diaphragm for alkaline water electrolysis (i.e., (1) allows no gas permeation through the diaphragm, (2) has ion permeability, (3) prevents short circuit between electrodes and (4) has mechanical and chemical strengths against alkaline water) and is capable of suppressing voltage increase from being caused by deposition of gas produced at the electrodes upon electrolysis onto a diaphragm surface.SOLUTION: A diaphragm for alkaline water electrolysis is equipped with an ion-permeable membrane and a porous reinforcement body arranged on either or both sides of the ion-permeable membrane, wherein the ion-permeable membrane is composed of a polymer having a moderately acidic ion exchange group, a weakly acidic ion exchange group, a strongly basic ion exchange group, a moderately basic ion exchange group or a weakly basic ion exchange group, and the porous reinforcement body shows wettability to an aqueous potassium hydroxide solution with a concentration of 30 wt.%. |
