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Abstract Rationally designing active and durable catalysts for the oxygen evolution reaction (OER) is of primary importance in water splitting. Perovskite oxides (ABO 3 ) with versatile structures and multiple physicochemical properties have triggered considerable interest in the OER. The leaching of A site cations can create nanostructures and amorphous motifs on the perovskite matrix, thus facilitating the OER process. However, selectively dissolving A site cations and simultaneously obtaining more active amorphous motifs derived from the B site cations remains a great challenge. Herein, a top‐down strategy is proposed to transform bulk crystalline perovskite (LaNiO 3 ) into a nanostructured amorphous hydroxide by FeCl 3 post‐treatment, resulting in an extremely low overpotential of 189 mV at 10 mA cm −2 . The top‐down‐constructed amorphous catalyst with a large surface area has dual NiFe active sites, where high‐valence Ni 3+ ‐based edge‐sharing octahedral frameworks are surrounded by interstitial distorted Fe octahedra and contribute to the superior OER performance. This top‐down strategy provides a valid way to design novel perovskite‐derived catalysts.
Chen et al. (Fri,) studied this question.