析氧
过电位
电催化剂
分解水
催化作用
电解质
材料科学
电化学
纳米线
化学工程
氧化物
猝灭(荧光)
无机化学
纳米技术
电极
化学
物理化学
冶金
物理
工程类
荧光
光催化
量子力学
生物化学
作者
Jae Young Yang,Yanan Wang,Jie Yang,Yajun Pang,Xinqiang Zhu,Yinzhuo Lu,Yitian Wu,Jiajie Wang,Hao Chen,Zongkui Kou,Zhen Shen,Zhenghui Pan,John Wang
出处
期刊:Small
[Wiley]
日期:2021-12-04
卷期号:18 (3)
被引量:38
标识
DOI:10.1002/smll.202106187
摘要
The electrochemical oxygen evolution reaction (OER) by efficient catalysts is a crucial step for the conversion of renewable energy into hydrogen fuel, in which surface/near-surface engineering has been recognized as an effective strategy for enhancing the intrinsic activities of the OER electrocatalysts. Herein, a facile quenching approach is demonstrated that can simultaneously enable the required surface metal doping and vacancy generation in reconfiguring the desired surface of the NiCo2 O4 catalyst, giving rise to greatly enhanced OER activities in both alkaline freshwater and seawater electrolytes. As a result, the quenched-engineered NiCo2 O4 nanowire electrode achieves a current density of 10 mA cm-2 at a low overpotential of 258 mV in 1 m KOH electrolyte, showing the remarkable catalytic performance towards OER. More impressively, the same electrode also displays extraordinary activity in an alkaline seawater environment and only needs 293 mV to reach 10 mA cm-2 . Density functional theory (DFT) calculations reveal the strong electronic synergies among the metal cations in the quench-derived catalyst, where the metal doping regulates the electronic structure, thereby yielding near-optimal adsorption energies for OER intermediates and giving rise to superior activity. This study provides a new quenching method to obtain high-performance transition metal oxide catalysts for freshwater/seawater electrocatalysis.
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