Gas diffusion layer for anion exchange membrane electrolysis, and manufacturing method therefor

Abstract

A gas diffusion layer for anion exchange membrane electrolysis which is hydrophilic and exhibits gas permeability is disclosed. A method for manufacturing the gas diffusion layer for anion exchange membrane electrolysis is disclosed. The gas diffusion layer for anion exchange membrane electrolysis contains a reticular carbon nanofiber film, wherein the carbon nanofiber has a diameter of 500 nm or less.

1 . A gas diffusion layer for anion exchange membrane electrolysis comprising a reticular carbon nanofiber film,
 wherein the carbon nanofiber has a diameter of 500 nm or less.   
     
     
         2 . The gas diffusion layer for anion exchange membrane electrolysis according to  claim 1 , wherein:
 the gas diffusion layer for anion exchange membrane electrolysis has a contact angle with water of 20° or less.   
     
     
         3 . The gas diffusion layer for anion exchange membrane electrolysis according to  claim 1 , wherein:
 the gas diffusion layer for anion exchange membrane electrolysis has a gas permeability of 1×10 −12  m 2  or more.   
     
     
         4 . The gas diffusion layer for anion exchange membrane electrolysis according to  claim 1 , wherein:
 the gas diffusion layer for anion exchange membrane electrolysis further comprises a porous support on one surface of the reticular carbon nanofiber film.   
     
     
         5 . The gas diffusion layer for anion exchange membrane electrolysis according to  claim 4 , wherein:
 the porous support is at least one selected from the group consisting of a porous carbon paper, a carbon fiber film, a carbon nanofiber film, and a carbon nanotube film.   
     
     
         6 . A method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis, the method comprising:
 spinning a carbon precursor material to form a reticular molded product (step 1); and   heat treating the reticular molded product to obtain a reticular carbon nanofiber film (step 2).   
     
     
         7 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 6 , wherein:
 the carbon precursor material in the step 1 is at least one selected from the group consisting of polyacrylonitrile, polyvinyl alcohol, polyvinylpyrrolidone, and precursors thereof, cellulose, lignin, and pitch.   
     
     
         8 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 6 , wherein:
 the spinning of the (step 1) is at least one selected from the group consisting of electrospinning, centrifugal jet spinning, melt-blown spinning, and spray spinning.   
     
     
         9 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 8 , wherein:
 the electrospinning spins a carbon precursor material in a solution state through a nozzle with a diameter of 1 to 5 mm, and   a voltage of 5 to 30 kV is applied to the nozzle.   
     
     
         10 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 6 , wherein:
 the heat treatment of step 2 is performed at a temperature of 700 to 1500° C. for one hour or more.   
     
     
         11 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 6 , wherein:
 spinning the carbon precursor material in the step 1 is spinning onto a porous support.   
     
     
         12 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 6 , wherein:
 the manufacturing method further comprises attaching the reticular carbon nanotube film obtained in step 2 to a porous support.   
     
     
         13 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 11 , wherein:
 the porous support is at least one selected from the group consisting of a porous carbon paper, a carbon fiber film, a carbon nanofiber film, and a carbon nanotube film.   
     
     
         14 . The method for manufacturing a gas diffusion layer for anion exchange membrane electrolysis according to  claim 12 , wherein:
 the porous support is at least one selected from the group consisting of a porous carbon paper, a carbon fiber film, a carbon nanofiber film, and a carbon nanotube film.