POSITIVE ELECTRODE FOR WATER ELECTROLYSIS, ELECTROLYSIS CELL AND METHOD FOR PRODUCING POSITIVE ELEC

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A positive electrode for water electrolysis, which comprises a nickel porous base and a thin film that is formed on at least a part of the surface of the base and contains a perovskite metal oxide having a composition represented by formula (1). LnNixCo(1-x)O3 (1) (In formula (1), Ln represents a metal element including a rare earth element; and x satisfies 0 < x ≤ 1.)