过电位
镍
析氧
X射线光电子能谱
掺杂剂
催化作用
材料科学
再分配(选举)
兴奋剂
化学
无机化学
化学工程
物理化学
电化学
冶金
电极
工程类
政治
生物化学
光电子学
法学
政治学
作者
Cheng‐Fei Li,Lingjie Xie,Jiawei Zhao,Lin‐Fei Gu,Haibo Tang,Lirong Zheng,Gao‐Ren Li
标识
DOI:10.1002/anie.202116934
摘要
The integration of Fe dopant and interfacial FeOOH into Ni-MOFs [Fe-doped-(Ni-MOFs)/FeOOH] to construct Fe-O-Ni-O-Fe bonding is demonstrated and the origin of remarkable electrocatalytic performance of Ni-MOFs is elucidated. X-ray absorption/photoelectron spectroscopy and theoretical calculation results indicate that Fe-O-Ni-O-Fe bonding can facilitate the distorted coordinated structure of the Ni site with a short nickel-oxygen bond and low coordination number, and can promote the redistribution of Ni/Fe charge density to efficiently regulate the adsorption behavior of key intermediates with a near-optimal d-band center. Here the Fe-doped-(Ni-MOFs)/FeOOH with interfacial Fe-O-Ni-O-Fe bonding shows superior catalytic performance for OER with a low overpotential of 210 mV at 15 mA cm-2 and excellent stability with ≈3 % attenuation after a 120 h cycle test. This study provides a novel strategy to design high-performance Ni/Fe-based electrocatalysts for OER in alkaline media.
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