Gas diffusion electrode and electrochemical reactor using it

摘要

There are provided a gaseous-diffusion electrode which can exhibit sufficient gas-supplying ability and gas-discharging ability and an excellent durability even when partly immersed in an electrolysis solution; and an electrochemical reactor using the gaseous-diffusion electrode. A porous membrane 15 which is permeable to gas but not to an electrolysis solution is fixed to the surface of the gaseous-diffusion layer 13 of a gaseous-diffusion electrode 11 obtained by joining a reaction layer 12 supporting a catalyst metal and a gaseous-diffusion layer 13 to each other, so as to cover the surface of the gaseous-diffusion layer 13. When a gas passageway member 17 serving as gas passageway to the gaseous-diffusion layer 13 is inserted between the surface of the gaseous-diffusion layer 13 and the porous membrane 15, the gas-supplying ability and the gas-discharging ability becomes more excellent. When an electrochemical reactor is composed by immersing the thus composed gaseous-diffusion electrode partly in an electrolysis solution in a pressure vessel composed of a closed vessel, electrolysis or the like can be continuously carried out. IMAGE