Electrode base, negative electrode for aqueous solution electrolysis using same, method for producing the electrode base, and method for producing the negative electrode for aqueous solution electrolysis

A method for producing an electrode base for forming an electrode catalyst layer, the method comprising the steps of:

• applying a nickel compound including a nickel atom, a carbon atom, an oxygen atom and a hydrogen atom to a surface of a conductive substrate having a nickel surface;
• and
• performing thermal decomposition at 250° C. to 600° C. in an atmosphere containing oxygen, thereby forming a mixture layer including metal nickel, a nickel oxide and carbon atoms.

A method for producing a negative electrode for aqueous solution electrolysis comprising the steps of:

• producing an electrode base by applying a nickel compound including a nickel atom, a carbon atom, an oxygen atom and a hydrogen atom to a surface of a conductive substrate having a nickel surface, and performing thermal decomposition at 250° C. to 600° C. in an atmosphere containing oxygen, thereby forming a mixture layer including metal nickel, a nickel oxide and carbon atoms;
• and
• forming an electrode catalyst layer by applying an electrode catalyst layer-forming solution including a platinum group metal compound to a surface of the mixture layer of the electrode base, and performing thermal decomposition in an atmosphere containing oxygen.