Electrode for electrolysis

Abstract

An electrode for electrolysis according to the present invention is an electrode for electrolysis including a conductive substrate; and a catalyst layer formed on a surface of the conductive substrate, wherein the catalyst layer comprises ruthenium element, iridium element, titanium element, and at least one first transition metal element selected from the group consisting of Sc, V, Cr, Fe, Co, Ni, Cu, and Zn, a content ratio of the first transition metal element contained in the catalyst layer based on 1 mol of the titanium element is 0.25 mol % or more and less than 3.4 mol %, and a D value being an indicator of an electric double layer capacitance of the electrode for electrolysis is 120 C/m2 or more and 420 C/m2 or less.

1 . An electrode for electrolysis comprising:
 a conductive substrate; and   a catalyst layer formed on a surface of the conductive substrate, wherein   the catalyst layer comprises ruthenium element, iridium element, titanium element, and at least one first transition metal element selected from the group consisting of Sc, V, Cr, Fe, Co, Ni, Cu, and Zn,   a content ratio of the first transition metal element contained in the catalyst layer based on 1 mol of the titanium element is 0.25 mol % or more and less than 3.4 mol %, and   a D value being an indicator of an electric double layer capacitance of the electrode for electrolysis is 120 C/m 2  or more and 420 C/m 2  or less.   
     
     
         2 . The electrode for electrolysis according to  claim 1 , wherein the first transition metal element forms a solid solution with a solid solution of a ruthenium oxide, an iridium oxide, and a titanium oxide. 
     
     
         3 . The electrode for electrolysis according to  claim 1 , wherein the first transition metal element comprises at least one metal element selected from the group consisting of vanadium, cobalt, copper, and zinc. 
     
     
         4 . The electrode for electrolysis according to  claim 1 , wherein the first transition metal element comprises vanadium element. 
     
     
         5 . The electrode for electrolysis according to  claim 1 , wherein a content ratio of the first transition metal element based on all metal elements contained in the catalyst layer is 10 mol % or more and 30 mol % or less. 
     
     
         6 . The electrode for electrolysis according to  claim 1 , wherein a content ratio of the first transition metal element contained in the catalyst layer based on 1 mol of the ruthenium element is 0.3 mol or more and less than 2 mol. 
     
     
         7 . The electrode for electrolysis according to  claim 1 , wherein the D value is 120 C/m 2  or more and 380 C/m 2  or less. 
     
     
         8 . A method for producing the electrode for electrolysis according to  claim 1 , comprising:
 preparing a coating liquid comprising a ruthenium compound, an iridium compound, a titanium compound and a compound comprising the first transition metal element;   coating at least one surface of the conductive substrate with the coating liquid to form a coating film; and   calcining the coating film under an oxygen-containing atmosphere to form the catalyst layer.   
     
     
         9 . An electrolyzer comprising the electrode for electrolysis according to  claim 1 .