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Scaled‐Up Synthesis of Amorphous NiFeMo Oxides and Their Rapid Surface Reconstruction for Superior Oxygen Evolution Catalysis
Author(s) -
Duan Yu,
Yu ZiYou,
Hu ShaoJin,
Zheng XuSheng,
Zhang ChuTian,
Ding HongHe,
Hu BiCheng,
Fu QiQi,
Yu ZhiLong,
Zheng Xiao,
Zhu JunFa,
Gao MinRui,
Yu ShuHong
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201909939
Subject(s) - oxygen evolution , overpotential , amorphous solid , catalysis , materials science , amorphous metal , oxide , chemical engineering , supersaturation , nanotechnology , inorganic chemistry , chemistry , electrode , electrochemistry , metallurgy , crystallography , organic chemistry , engineering
The anode oxygen evolution reaction (OER) is known to largely limit the efficiency of electrolyzers owing to its sluggish kinetics. While crystalline metal oxides are promising as OER catalysts, their amorphous phases also show high activities. Efforts to produce amorphous metal oxides have progressed slowly, and how an amorphous structure benefits the catalytic performances remains elusive. Now the first scalable synthesis of amorphous NiFeMo oxide (up to 515 g in one batch) is presented with homogeneous elemental distribution via a facile supersaturated co‐precipitation method. In contrast to its crystalline counterpart, amorphous NiFeMo oxide undergoes a faster surface self‐reconstruction process during OER, forming a metal oxy(hydroxide) active layer with rich oxygen vacancies, leading to superior OER activity (280 mV overpotential at 10 mA cm −2 in 0.1 m KOH). This opens up the potential of fast, facile, and scale‐up production of amorphous metal oxides for high‐performance OER catalysts.