析氧
材料科学
浸出(土壤学)
层状双氢氧化物
氧气
化学工程
电化学
无机化学
化学
冶金
有机化学
氢氧化物
电极
物理化学
环境科学
土壤科学
土壤水分
工程类
作者
Haonan Guo,Lei Zhang,Deliu Ou,Qiao Liu,Zhaohui Wu,Weiyou Yang,Zhi Fang,Qing Shi
出处
期刊:Small
[Wiley]
日期:2023-11-14
标识
DOI:10.1002/smll.202307069
摘要
Optimizing the active centers through reconstruction is recognized as the key to construct high-performance oxygen evolution reaction (OER) catalysts. Herein, a simple and rapid in situ leaching strategy to promote the self-reconstruction of NiFe-layered double hydroxides (LDHs) catalysts is reported. The trace Zn dopants are introduced in advance by a facile and one-step hydrothermal method, followed by leaching over the electrochemical activation process, which can remarkably reduce the formation potential of NiFeOOH active centers to enable the deeper self-reconstruction for the formation of abundant highly active centers. Moreover, the self-restructured NiFeOOH-VZn cannot only significantly lower the dehydrogenation energy barrier for the transformation from Ni(OH)2 to NiOOH, but also decrease the free energy barrier of rate determining step for the *OH converted to *O through a deprotonation process, thus significantly boosting the OER behaviors. As a proof of concept, the obtained NiFeOOH-VZn catalyst just requires a low overpotential of 240 mV at 10 mA cm-2 , and delivers robust stability at 50 mA cm-2 over 120 h, which outperforms the benchmark of noble metal RuO2 and those of most non-noble metal catalysts ever reported.
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