Gas diffusion electrode equipped ion exchange membrane electrolyzer

Abstract

Provided is a gas diffusion electrode equipped ion exchange membrane electrolyzer including an anode, an ion-exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, wherein in a cathode gas chamber formed between a back plate of the cathode chamber and one side of the gas diffusion electrode opposite to the electrolytic surface, a gas-permeable elastic member is disposed between the gas diffusion electrode and the back plate, and the elastic member forms a conductive connection between the gas diffusion electrode and the back plate by making contact with corrosion-resistant conductive layers formed on the surfaces of a plurality of conductive members which are joined to the back plate.

1 . A gas diffusion electrode equipped ion exchange membrane electrolyzer having an anode, an ion exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, characterized in that
 in a cathode gas chamber formed between a back plate of the cathode chamber and one side of the gas diffusion electrode opposite to the electrolytic surface, a gas-permeable elastic member is disposed between the gas diffusion electrode and the back plate, and the elastic member forms a conductive connection between the gas diffusion electrode and the back plate by making contact with corrosion-resistant conductive layers formed on the surfaces of a plurality of conductive members which are joined to the back plate.   
     
     
         2 . The gas diffusion electrode equipped ion exchange membrane electrolyzer according to  claim 1 , characterized in that
 the conductive member has a silver or platinum group metal-containing corrosion-resistant conductive layer on a foil or plate made of nickel or a nickel alloy.   
     
     
         3 . The gas diffusion electrode equipped ion exchange membrane electrolyzer according to  claim 1 , characterized in that
 the conductive member is obtained by integrating the silver or platinum group metal-containing corrosion-resistant conductive layer by means of plating, cladding or baking coating.   
     
     
         4 . The gas diffusion electrode equipped ion exchange membrane electrolyzer according to  claim 1 , characterized in that
 a part of or the entire conductive member is joined to the back plate.   
     
     
         5 . The gas diffusion electrode equipped ion exchange membrane electrolyzer according to  claim 1 , characterized in that
 the elastic member forms a corrosion-resistant conductive layer on a conductive contacting surface or the entire surface thereof.   
     
     
         6 . A manufacturing method of an alkali metal hydroxide aqueous solution, comprising:
 providing a gas diffusion electrode equipped ion exchange membrane electrolyzer having an anode, an ion exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, characterized in that, in a cathode gas chamber formed between a back plate of the cathode chamber and one side of the gas diffusion electrode opposite to the electrolytic surface, a gas-permeable elastic member is disposed between the gas diffusion electrode and the back plate, and the elastic member forms a conductive connection between the gas diffusion electrode and the back plate by making contact with corrosion-resistant conductive layers formed on the surfaces of a plurality of conductive members which are joined to the back plate; and   using the gas diffusion electrode to manufacture an alkali metal hydroxide aqueous solution.   
     
     
         7 . a manufacturing method of chlorine, comprising:
 providing a gas diffusion electrode equipped ion exchange membrane electrolyzer having an anode, an ion exchange membrane, and a cathode chamber in which a gas diffusion electrode is disposed, characterized in that, in a cathode gas chamber formed between a back plate of the cathode chamber and one side of the gas diffusion electrode opposite to the electrolytic surface, a gas-permeable elastic member is disposed between the gas diffusion electrode and the back plate, and the elastic member forms a conductive connection between the gas diffusion electrode and the back plate by making contact with corrosion-resistant conductive layers formed on the surfaces of a plurality of conductive members which are joined to the back plate; and   using the gas diffusion electrode to manufacture chlorine.