Tailoring hypervalent Nickel induced by oxygen vacancy toward enhanced oxygen evolution reaction performance in self-supporting NiFe-(oxy) hydroxides electrodes

被引：2

作者：

Kong, Chun ^{[1
]}

Zhi, Chuang ^{[1
]}

Wu, Zirui ^{[1
]}

Yang, Wenqiang ^{[2
]}

Yang, Juan ^{[1
]}

Sun, Zhongti ^{[1
]}

机构：

[1] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Peoples R China

[2] Univ South Carolina, Chem Engn, 301 S Main St, Columbia, SC 29208 USA

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2024年 / 665卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

NiFe-(oxy)hydroxides; Hypervalent Ni; Volcano -type relationship; Oxygen vacancy; Oxygen evolution reaction; ENERGY; BETA-NI(OH)(2); NANOSHEETS;

D O I：

10.1016/j.jcis.2024.03.184

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

NiFe-(oxy)hydroxides are the most active transition metal oxide electrocatalysts for oxygen evolution reaction (OER) under the alkaline media. Herein, we controllably manipulated oxygen vacancy (VO)-tunable NiFe-(oxy) hydroxides that their OER performances possessed a volcano-type relationship with VO concentration, positivelycorrelated with Ni3+/Ni2+ ratio. Theoretical simulations further unearthed the enhanced activation and dissociation of H2O by the inserting of VO. As a result, the optimal sample featuring the Ni3+/Ni2+ ratio of 30.3 % and VO of 23.8 % exhibited the overpotential of 243 mV at the current density of 100 mA cm-2, simultaneously lasting 120 h durability without any attenuation, exceding the most reported NiFe-(oxy)hydroxides. This work offers an innovative view to understand the OER performance using hypervalent Ni ratio induced by VO defects.

引用

页码：863 / 870

页数：8

共 34 条

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