Electrolyte Membrane and Manufacturing Method of Electrolyte Membrane

Abstract

There is provided an electrolyte membrane that is disposed between an electrolytic solution in an oxidation tank and a reduction electrode in a reduction tank to be in contact with both the electrolytic solution and the reduction electrode and is used in a carbon dioxide reduction device which performs a carbon dioxide reduction reaction by bringing carbon dioxide into direct contact with the reduction electrode, the electrolyte membrane including: a water-repellent film on a part of a surface which is in contact with the electrolytic solution.

1 . An electrolyte membrane that is disposed between an electrolytic solution in an oxidation tank and a reduction electrode in a reduction tank to be in contact with both the electrolytic solution and the reduction electrode and is used in a carbon dioxide reduction device which performs a carbon dioxide reduction reaction by bringing carbon dioxide into direct contact with the reduction electrode, the electrolyte membrane comprising:
 a water-repellent film on a part of a surface which is in contact with the electrolytic solution.   
     
     
         2 . The electrolyte membrane according to  claim 1 ,
 wherein the oxidation tank performs an oxidation reaction of water with light energy by using the electrolytic solution and a semiconductor oxidation electrode immersed in the electrolytic solution, and   wherein the reduction tank performs a carbon dioxide reduction reaction by using the reduction electrode connected to the oxidation electrode via a conducting wire and carbon dioxide brought into direct contact with the reduction electrode.   
     
     
         3 . The electrolyte membrane according to  claim 1 ,
 wherein the oxidation tank performs an oxidation reaction of water with electrical energy by using the electrolytic solution and a metal oxidation electrode immersed in the electrolytic solution, and   wherein the reduction tank performs a carbon dioxide reduction reaction by using the reduction electrode connected to a source of the electrical energy and carbon dioxide brought into direct contact with the reduction electrode.   
     
     
         4 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 1  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         5 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 1  is manufactured, the method comprising:
 a step of applying a water-repellent polymer to one surface of the electrolyte membrane; and 
 a step of removing a solvent in the water-repellent polymer. 
 
     
     
         6 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 1  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         7 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 1  is manufactured, the method comprising:
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on one surface of the electrolyte membrane. 
 
     
     
         8 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 2  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         9 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 3  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         10 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 2  is manufactured, the method comprising:
 a step of applying a water-repellent polymer to one surface of the electrolyte membrane; and 
 a step of removing a solvent in the water-repellent polymer. 
 
     
     
         11 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 3  is manufactured, the method comprising:
 a step of applying a water-repellent polymer to one surface of the electrolyte membrane; and 
 a step of removing a solvent in the water-repellent polymer. 
 
     
     
         12 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 2  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         13 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 3  is manufactured, the method comprising:
 a step of applying a water-soluble polymer to one surface of the electrolyte membrane; 
 a step of removing moisture in the water-soluble polymer; 
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on both surfaces of the electrolyte membrane; and 
 a step of removing the water-soluble polymer from the one surface of the electrolyte membrane. 
 
     
     
         14 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 2  is manufactured, the method comprising:
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on one surface of the electrolyte membrane. 
 
     
     
         15 . A method for manufacturing an electrolyte membrane by which the electrolyte membrane according to  claim 3  is manufactured, the method comprising:
 a step of performing a water-repellent treatment of heating and depositing a water-repellent low molecular substance on one surface of the electrolyte membrane.