材料科学
析氧
燃烧
电化学
氧气
氢氧化物
化学工程
层状双氢氧化物
无机化学
电极
有机化学
化学
物理化学
工程类
作者
Yu Zhou,Jinqiang Gao,Min Ju,Yanpeng Chen,Haifeng Yuan,Simeng Li,Jinlong Li,Dongxuan Guo,Mei Hong,Shihe Yang
标识
DOI:10.1021/acsami.4c03766
摘要
NiFe layered double hydroxide (LDH) with abundant heterostructures represents a state-of-the-art electrocatalyst for the alkaline oxygen evolution reaction (OER). Herein, NiFe LDH/Fe2O3 nanosheet arrays have been fabricated by facile combustion of corrosion-engineered NiFe foam (NFF). The in situ grown, self-supported electrocatalyst exhibited a low overpotential of 248 mV for the OER at 50 mA cm–2, a small Tafel slope of 31 mV dec–1, and excellent durability over 100 h under the industrial benchmarking 500 mA cm–2 current density. A balanced Ni and Fe composition under optimal corrosion and combustion contributed to the desirable electrochemical properties. Comprehensive ex-situ analyses and operando characterizations including Fourier-transformed alternating current voltammetry (FTACV) and in situ Raman demonstrate the beneficial role of modulated interfacial electron transfer, dynamic atomic structural transformation to NiOOH, and the high-valence active metal sites. This study provides a low-cost and easy-to-expand way to synthesize efficient and durable electrocatalysts.
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