过电位
纳米片
介孔材料
材料科学
层状双氢氧化物
析氧
集聚经济
化学工程
纳米技术
化学
催化作用
物理化学
电极
电化学
工程类
有机化学
作者
Ping Wang,Shaojia Song,Miao He,Chenyu Li,Weiwei Wang,Huan Li,Xilin Yuan,Fang Zhao,Kimaka P. Rinel,Weiyu Song,Jiang Li,Dionisios G. Vlachos,Zhenxing Li
出处
期刊:Chem catalysis
[Elsevier]
日期:2023-02-01
卷期号:3 (2): 100497-100497
被引量:1
标识
DOI:10.1016/j.checat.2022.100497
摘要
As a result of the agglomeration of layered double-metal hydroxides (LDHs), their electrocatalytic activity of oxygen evolution reaction (OER) is usually suppressed. Herein, we propose simple co-precipitation and surface etching for the preparation of ordered macroporous-mesoporous CoNiFe-LDHs with high-density defects. The ordered structure avoids the agglomeration of single-layer nanosheets. Meanwhile, the high-density defects on the nanosheet surface generate abundant metal vacancies and oxygen vacancies, distorting the single-layer nanosheets significantly and altering the electronic properties around the metal (M)–M and M–O bonds, which enhances the adsorption of intermediates and accelerates the rate-controlling reaction step of O∗ → OOH∗. This new material shows an extremely low overpotential of 197 mV at a current density of 10 mA cm−2 and a surprising stability of over 70 h in alkaline media. This work provides a new synthesis protocol for hierarchical porous LDHs with excellent OER catalytic activity.
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