材料科学
过电位
析氧
合金
电催化剂
催化作用
金属
化学工程
分解水
过渡金属
活动站点
碳化物
电化学
冶金
电极
物理化学
化学
光催化
有机化学
工程类
作者
Miao Wang,Yiqing Wang,Samuel S. Mao,Shaohua Shen
出处
期刊:Nano Energy
[Elsevier]
日期:2021-10-01
卷期号:88: 106216-106216
被引量:39
标识
DOI:10.1016/j.nanoen.2021.106216
摘要
Given oxygen evolution reaction as the rate-limiting step for electrocatalytic water splitting, it is essential to accelerate water oxidation kinetics by modulating the population and intrinsic activity of active sites. Herein, by annealing the mixture of Fe, Ni, and Mo precursors, FeNi alloys compositing with Mo2C heterophases supported on carbon layers (FeNi–Mo2C/C) were synthesized and exhibited a promising activity for oxygen evolution, with a small overpotential of 288 mV at 10 mA cm-2, which is even superior to the benchmark noble metal-based catalyst (e.g., RuO2). The introduced Mo2C heterophases reduced the particle size of FeNi alloys, increasing the amount of surface electrocatalytically active sites, and tuned the electronic structures of FeNi alloys, stimulating the surface phase transformation with highly-active metal oxides formed for the enhanced intrinsic activity of active sites. This work presents an effective and alternative approach to the modulation of electrocatalytic active sites for electrochemical energy applications.
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