| CPC C25B 11/091 (2021.01) [B01J 23/8472 (2013.01); B01J 27/18 (2013.01); B01J 27/1853 (2013.01); B01J 27/24 (2013.01); B01J 35/53 (2024.01); C25B 11/031 (2021.01); C25B 11/054 (2021.01); C25B 11/061 (2021.01); C25D 9/04 (2013.01)] | 11 Claims |

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1. A water electrolysis catalyst with a core-shell structure, having:
a vanadium-doped cobalt nitride (V—Co4N) core; and
a cobalt-nickel phosphate (CoNiPOx, x is a natural number) shell,
wherein, in the vanadium-doped cobalt nitride, vanadium is doped at 3 at %.
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