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An Amorphous Nickel–Iron‐Based Electrocatalyst with Unusual Local Structures for Ultrafast Oxygen Evolution Reaction
Author(s) -
Chen Gao,
Zhu Yanping,
Chen Hao Ming,
Hu Zhiwei,
Hung SungFu,
Ma Nana,
Dai Jie,
Lin HongJi,
Chen ChienTe,
Zhou Wei,
Shao Zongping
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201900883
Subject(s) - oxygen evolution , overpotential , materials science , amorphous solid , electrocatalyst , water splitting , catalysis , chemical engineering , perovskite (structure) , hydroxide , nanotechnology , inorganic chemistry , crystallography , chemistry , electrode , photocatalysis , biochemistry , engineering , electrochemistry
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.