Production method for electrode for electrolysis
The present invention provides a method for manufacturing an electrolytic electrode, the method capable of appropriately controlling the amount of an electrode catalyst component as desired and also capable of manufacturing a high-performance electrolytic electrode in a cost-effective and efficient way without affecting the electrode performance. A method for manufacturing an electrolytic electrode including a step of forming an electrode catalyst layer on each of a front and a back of a conductive electrode substrate, by applying a coating solution containing a starting material for the electrode catalyst component on the front of the conductive electrode substrate with a plurality of holes, the conductive electrode substrate being expanded mesh or the like, and thereafter drying and firing the coating solution, wherein the substrate contains at least one metal selected from the group consisting of Ti, Ta, Nb, Zr, Hf, and Ni, and alloys thereof, the electrode catalyst component contains at least one selected from the group consisting of Pt, Ir, Ru, Pd, Os, and oxides thereof, and an amount of the electrode catalyst component adhering to the back of the substrate is controlled by preheating the substrate to a temperature higher than room temperature at least once before the coating solution is applied and/or by presetting the temperature to which the substrate is preheated in the electrode catalyst layer-forming step.
1. A method for manufacturing an electrolytic electrode comprising:
forming an electrode catalyst layer comprising an electrode catalyst component on each of a front surface and a back surface of a conductive electrode substrate having a plurality of holes, the forming the electrode catalyst comprising:
applying a coating solution comprising a starting material of the electrode catalyst component to the front surface of the conductive electrode substrate, and thereafter
drying and firing the coating solution,
wherein the conductive electrode substrate is in at least one form selected from the group consisting of an expanded mesh, a punched perforated plate, and a wire netting, provided that the conductive electrode substrate is not a fired body obtained by firing metal powder or metal fiber and a metal woven fabric,
the electrode catalyst layer formed on the back surface of the conductive electrode comprises the catalyst component in the coating solution that has been applied to the front surface of the conductive electrode and has migrated to the back surface of the conductive electrode by passing through the plurality of holes in the conductive electrode substrate,
the conductive electrode substrate comprises at least one metal selected from the group consisting of titanium, tantalum, niobium, zirconium, hafnium, and nickel, and alloys thereof,
a thickness of the conductive electrode substrate is in a range from 0.5 mm to 3.0 mm
the electrode catalyst component comprises at least one material selected from the group consisting of platinum, iridium, ruthenium, palladium, osmium, and oxides thereof,
in the forming the electrode catalyst layer, the conductive electrode substrate is at least once subjected to a preheating treatment in which the conducive electrode substrate is preheated to a preheating temperature higher than room temperature immediately before the applying the coating solution to the front surface of the substrate, and
a ratio (AB) of an amount (A) of the electrode catalyst component adhering to the front surface of the conductive electrode substrate relative to an amount (B) of the electrode catalyst component adhering to the back surface of the conductive electrode substrate is controlled to be within a range from 1.5 to 6.8 by selecting the preheating temperature.
2. The method for manufacturing an electrolytic electrode according to claim 1 ,
wherein the conductive electrode substrate immediately before the applying the coating solution is in a range from 35° C. to 120° C.
3. The method for manufacturing an electrolytic electrode according to claim 1 ,
wherein the preheating temperature of the conductive electrode substrate immediately before the applying the coating solution is in a range from 35° C. to 70° C.
4. The method for manufacturing an electrolytic electrode according to claim 1 ,
wherein the amount ratio (AB) of the amount (A) relative to the amount (B) is controlled to be a ratio within a range from 1.5 to 4.4.
5. The method for manufacturing an electrolytic electrode according to claim 1 ,
wherein the amount (B) of the electrode catalyst component adhering to the back surface of the conductive electrode substrate and the amount ratio (A/B) are further controlled by selecting a number of times of the preheating treatment of the conductive electrode substrate in the electrode catalyst layer-forming step.
6. The method for manufacturing an electrolytic electrode according to claim 1 ,
wherein the coating solution is an inorganic solution or an organic solution, in which the starting material is dissolved.