Water electrolysis cell

Abstract

A water electrolysis cell includes a membrane-electrode assembly, a frame body made of resin that is provided along a peripheral edge of the membrane-electrode assembly, and a first separator and a second separator that face each other through the membrane-electrode assembly and the frame body and are joined to each other by the frame body. An outer peripheral portion of the membrane-electrode assembly is extended to between a first face of the frame body and the first separator. A surface of the first face includes an antioxidant.

What is claimed is: 
     
         1 . A water electrolysis cell comprising:
 a membrane-electrode assembly;   a frame body made of resin that is provided along a peripheral edge of the membrane-electrode assembly; and   a first separator and a second separator that face each other through the membrane-electrode assembly and the frame body and are joined to each other by the frame body, wherein:   an outer peripheral portion of the membrane-electrode assembly is extended to between a first face of the frame body and the first separator; and   a surface of the first face includes an antioxidant.   
     
     
         2 . The water electrolysis cell according to  claim 1 , wherein the antioxidant includes a chelating agent. 
     
     
         3 . The water electrolysis cell according to  claim 1 , wherein:
 the frame body includes a second face located on the opposite side from the first face; and   a content concentration of the antioxidant is higher in the surface of the first face than in a surface of the second face.   
     
     
         4 . The water electrolysis cell according to  claim 3 , wherein:
 the membrane-electrode assembly includes an electrolyte membrane and a first catalyst layer;   outer peripheral portions of the electrolyte membrane and the first catalyst layer are extended to between the first face of the frame body and the first separator;   the first catalyst layer is in contact with the first face through the electrolyte membrane; and   the first catalyst layer and the electrolyte membrane are not in contact with the second face.   
     
     
         5 . The water electrolysis cell according to  claim 3 , wherein:
 the frame body has a structure in which a first resin layer, a core layer, and a second resin layer are stacked in a thickness direction;   the first resin layer constitutes the first face;   the second resin layer constitutes the second face; and   a content concentration of the antioxidant is higher in the first resin layer than in the second resin layer.