Water electrolysis related processes

Japan has developed a solid polymer water electrolysis process that can use a fluororesin-based ion exchange membrane as a solid electrolyte for proton conductors. As the solid polymer electrolyte becomes thinner, the electrolyte resistance becomes smaller, which is beneficial to electrolysis operation at high current density.
Such as using solid oxide electrolyte. It is possible to apply a high-temperature water electrolysis process using water vapor. The theoretical decomposition voltage of this process is small, the required amount of electrical energy becomes smaller, especially the overpotential that is the resistance to the electrolysis reaction becomes smaller. Therefore, it is expected to be the electrolysis method with the highest efficiency and electrolysis operation with the lowest cell voltage.
In the solid polymer water electrolyzer developed in Japan, the cathode is a platinum-coated graphite electrode material, the anode is an iridium-based alloy and iridium oxide, and the gap between the assembly and the ion exchange membrane is 150 to 300um, thus achieving high efficiency. The cathode matrix is graphite. Titanium is often used as the anode base.