Electrode for electrolysis, electrolyzer, electrode laminate and method for renewing electrode

Abstract

An electrode for electrolysis including a conductive substrate formed of a porous metal plate, and at least one catalyst layer formed on a surface of the conductive substrate, wherein the electrode for electrolysis has a thickness of more than 0.5 mm and 1.2 mm or less; and value C, which is obtained by dividing sum B of perimeters of openings of the electrode for electrolysis by opening ratio A of the electrode for electrolysis, is more than 2 and 5 or less.

1 . An electrode for electrolysis comprising
 a conductive substrate formed of a porous metal plate, and   at least one catalyst layer formed on a surface of the conductive substrate, wherein   the electrode for electrolysis has a thickness of more than 0.5 mm and 1.2 mm or less; and   value C, which is obtained by dividing sum B of perimeters of openings of the electrode for electrolysis by opening ratio A of the electrode for electrolysis, is more than 2 and 5 or less.   
     
     
         2 . The electrode for electrolysis according to  claim 1 , wherein the opening ratio A is 5% or more and less than 25%. 
     
     
         3 . The electrode for electrolysis according to  claim 1 , wherein center-to-center distance SW of the openings in a minor-axis direction of a mesh is 1.5 or more and 3 or less; and center-to-center distance LW in a major-axis direction of the mesh is 2.5 or more and 5 or less. 
     
     
         4 . The electrode for electrolysis according to  claim 1 , wherein the electrode for electrolysis has a thickness of more than 0.5 mm and 0.9 mm or less. 
     
     
         5 . The electrode for electrolysis according to  claim 1 , wherein value E represented by the following formula (1) is 0.5 or more
     E=B /( A ×( SW   2   +LW   2 ) 1/2 )  (1).
   
     
     
         6 . An electrolyzer comprising
 an anode chamber comprising, as an anode, the electrode for electrolysis according to  claim 1 ,   a cathode chamber comprising a cathode, and   an ion exchange membrane isolating the anode chamber from the cathode chamber.   
     
     
         7 . The electrolyzer according to  claim 6 , wherein the ion exchange membrane has a projection formed of a polymer constituting the ion exchange membrane on a surface facing the anode. 
     
     
         8 . An electrode laminate comprising
 the electrode for electrolysis according to  claim 1  and   a base electrode different from the electrode for electrolysis.   
     
     
         9 . The electrode laminate according to  claim 8 , wherein the electrode for electrolysis has a thickness of more than 0.5 mm and 0.65 mm or less. 
     
     
         10 . A method for renewing an electrode, comprising welding the electrode for electrolysis according to  claim 1  on an existing electrode in an electrolyzer. 
     
     
         11 . An electrode for electrolysis comprising
 a conductive substrate formed of a porous metal plate, and   at least one catalyst layer formed on a surface of the conductive substrate, wherein   a shape of openings of the electrode for electrolysis is right-and-left symmetric about a first imaginary center line extending in a minor-axis direction of a mesh and up-and-down asymmetric about a second imaginary center line extending in a major-axis direction of the mesh; and   the electrode for electrolysis has a thickness of more than 0.5 mm and 1.2 mm or less.   
     
     
         12 . The electrode for electrolysis according to  claim 11 , wherein when the openings each are partitioned in portion a and portion b by the second imaginary center line, a value obtained by dividing area Sa of the portion a by area Sb of the portion b is 1.15 or more and 2.0 or less. 
     
     
         13 . The electrode for electrolysis according to  claim 11 , wherein a value obtained by dividing value St, which is obtained by subtracting a maximum size of the openings in the minor-axis direction of a mesh from center-to-center distance SW of the openings in the minor-axis direction of the mesh, by the SW is 0.4 or more.