Electrode for electrolysis and process for producing the same

1. An electrode for electrolysis comprising:

a conductive substrate; and

a conductive diamond formed on a surface of the conductive substrate,

the conductive substrate having at least one surface shape selected from the group consisting of:

(a) a surface shape of a combination of an Ra of 100-1,000 μm and an RSm of 50-10,000 μm;

(b) a surface shape of a combination of an Ra of 2.5-100 μm and an RSm of 1.5-800 μm; and

(c) a surface shape of a combination of an Ra of 0.01-2 μm and an RSm of 0.005-250 μm.

2. The electrode for electrolysis according to claim 1 ,

wherein the surface shape (c) is a combination of an Ra of 0.01-0.1 μm and an RSm of 0.005-20 μm.

3. A process for producing an electrode for electrolysis, the process comprising:

conducting a surface treatment on a surface of a conductive substrate by at least one method selected from the group consisting of:

(a) machining to form recesses and protrusions having an Ra of 100-1,000 μm and an RSm of 50-10,000 μm on the surface of the conductive substrate;

(b) blasting to form recesses and protrusions having an Ra of 2.5-100 μm and an RSm of 1.5-800 μm; and

(c) at least one of etching and heat-treating to form recesses and protrusions having an Ra of 0.01-2 μm and an RSm of 0.005-250 μm on the surface of the conductive substrate, and

coating the conductive substrate having the recesses and protrusions with a conductive diamond layer.

4. The process for producing an electrode for electrolysis according to claim 3 ,

wherein the method (c) is at least one of etching and heat-treating to form recesses and protrusions having an Ra of 0.01-0.1 μm and an RSm of 0.005-20 μm on the surface of the conductive substrate.

5. The process for producing an electrode for electrolysis according to claim 3 ,

wherein the coating of the surface of the conductive substrate with the conductive diamond layer is conducted by the CVD method.