	US 12,234,563 B2
	Method for manufacturing electrode, and electrode
Awaludin Zaenal, Fujisawa (JP); Akihiro Kato, Fujisawa (JP); Takaaki Nakai, Fujisawa (JP); Osamu Arimoto, Fujisawa (JP); Akihiro Madono, Fujisawa (JP); and Sayaka Fukuda, Fujisawa (JP)
Assigned to DE NORA PERMELEC LTD, Fujisawa (JP)
Appl. No. 18/569,324
Filed by DE NORA PERMELEC LTD, Fujisawa (JP)
PCT Filed Jul. 1, 2022, PCT No. PCT/JP2022/026487 § 371(c)(1), (2) Date Dec. 12, 2023, PCT Pub. No. WO2023/286641, PCT Pub. Date Jan. 19, 2023.
Claims priority of application No. 2021-115095 (JP), filed on Jul. 12, 2021.
Prior Publication US 2024/0263327 A1, Aug. 8, 2024
Int. Cl. C25B 11/061 (2021.01); C21D 6/00 (2006.01); C22F 1/10 (2006.01); C23F 1/16 (2006.01); C23F 17/00 (2006.01); C25B 1/04 (2021.01)

CPC C25B 11/061 (2021.01) [C21D 6/001 (2013.01); C22F 1/10 (2013.01); C23F 1/16 (2013.01); C23F 17/00 (2013.01); C25B 1/04 (2013.01)]

7 Claims

1. A method for producing an oxygen generation anode for water electrolysis, comprising:

thermally treating an electrically conductive substrate comprising a nickel alloy comprising Ni in a range from 30 to 70% by mass, and Fe in a range from 30 to 70% by mass, relative to a total of Ni and Fe as 100% by mass, at a temperature in a range from 500 to 600° C., thereby a surface layer comprising Fe as a main component being formed; and

etching the thermally treated electrically conductive substrate with an etchant comprising an organic acid and a weak inorganic acid so that the surface layer is at least partially removed, thereby the anode having an at least partially porous surface comprising Ni as a main component being obtained in an area of the surface layer where the surface layer has been partially removed by the etching with the etchant.