Electrode for electrolysis, laminate, wound body, electrolyzer, method for producing electrolyzer, method for renewing electrode, method for renewing laminate, and method for producing wound body

Abstract

The present invention relates to an electrode for electrolysis, a laminate, a wound body, an electrolyzer, a method for producing an electrolyzer, a method for renewing an electrode, a method for renewing a laminate, and a method for producing a wound body. An electrode for electrolysis according to one aspect of the present invention has a mass per unit area of 48 mg/cm2 or less and a force applied per unit mass·unit area of 0.08 N/mg·cm2 or more.

1 . An electrode for electrolysis having a mass per unit area of 48 mg/cm 2  or less and a force applied per unit mass·unit area of 0.08 N/mg·cm 2  or more. 
     
     
         2 . The electrode for electrolysis according to  claim 1 , wherein the electrode for electrolysis comprises a substrate for electrode for electrolysis and a catalytic layer, and the substrate for electrode for electrolysis has a thickness of 300 μm or less. 
     
     
         3 . The electrode for electrolysis according to  claim 1  or  2 , wherein a proportion measured by a method (3) below is 75% or more:
 [Method (3)]
 An ion exchange membrane (170 mm square), which is obtained by applying inorganic material particles and a binder to both surfaces of a membrane of a perfluorocarbon polymer into which an ion exchange group is introduced and a sample of electrode for electrolysis (130 mm square) are laminated in this order; and the laminate is placed on a curved surface of a polyethylene pipe (outer diameter: 145 mm) such that the sample of electrode for electrolysis in this laminate is positioned outside under conditions of a temperature of 23±2° C. and a relative humidity of 30±5%, the laminate and the pipe are sufficiently immersed in pure water, excess water deposited on a surface of the laminate and the pipe is removed, and one minute after this removal, then a proportion) of an area of a portion, in which the sample of electrode for electrolysis is in close contact with the membrane obtained by applying the inorganic material particles and the binder to both the surfaces of the membrane of the perfluorocarbon polymer into which the ion exchange group is introduced, is measured. 
 
 
     
     
         4 . The electrode for electrolysis according to  claim 1  or  2 , wherein the electrode for electrolysis has a porous structure and has an opening ratio of 5 to 90%. 
     
     
         5 . The electrode for electrolysis according to  claim 1  or  2 , wherein the electrode has a porous structure and has an opening ratio of 10 to 80%. 
     
     
         6 . The electrode for electrolysis according to  claim 1  or  2 , wherein the electrode for electrolysis has a thickness of 315 or less. 
     
     
         7 . The electrode for electrolysis according to  claim 1  or  2 , wherein a value obtained by measuring the electrode for electrolysis by a method (A) below is 40 mm or less:
 [Method (A)]
 Under conditions of a temperature of 23±2° C. and a relative humidity of 30±5%, a sample obtained by laminating the ion exchange membrane and the electrode for electrolysis is wound around and fixed onto a curved surface of a core material being made of polyvinyl chloride and having an outer diameter ϕ of 32 mm, and left to stand for 6 hours; thereafter, when the electrode for electrolysis is separated from the sample and placed on a flat plate, heights in a vertical direction at both edges of the electrode for electrolysis L 1  and L 2  are measured, and an average value thereof is used as a measurement value. 
 
 
     
     
         8 . The electrode for electrolysis according to  claim 1  or  2 , wherein a ventilation resistance is 24 kPa·s/m or less when the electrode for electrolysis has a size of 50 mm×50 mm, the ventilation resistance being measured under conditions of the temperature of 24° C., the relative humidity of 32%, a piston speed of 0.2 cm/s, and a ventilation volume of 0.4 cc/cm 2 /s. 
     
     
         9 . (canceled) 
     
     
         10 . A laminate comprising the electrode for electrolysis according to  claim 1  or  2 . 
     
     
         11 . A wound body comprising the electrode for electrolysis according to  claim 1  or  2 . 
     
     
         12 . A laminate comprising:
 an electrode for electrolysis, and   a membrane or feed conductor in contact with the electrode for electrolysis,   wherein a force applied per unit mass·unit area of the electrode for electrolysis on the membrane or feed conductor is less than 1.5 N/mg·cm 2 .   
     
     
         13 . The laminate according to  claim 12 , wherein the force applied per unit mass·unit area of the electrode for electrolysis on the membrane or feed conductor is more than 0.005 N/mg·cm 2 . 
     
     
         14 . The laminate according to  claim 12  or  13 , wherein the feed conductor is a wire mesh, a metal nonwoven fabric, a perforated metal, an expanded metal, or a foamed metal. 
     
     
         15 . The laminate according to  claim 12  or  13 , comprising, as at least one surface layer of the membrane, a layer comprising a mixture of hydrophilic oxide particles and a polymer into which ion exchange groups are introduced. 
     
     
         16 . The laminate according to  claim 12  or  13 , wherein a liquid is interposed between the electrode for electrolysis and the membrane or feed conductor. 
     
     
         17 - 60 . (canceled)