过电位
材料科学
电催化剂
磷化物
催化作用
化学工程
电流密度
氧化钴
析氧
电化学
无定形固体
纳米技术
电解水
涂层
分解水
钴
光催化
电解
电极
镍
化学
物理化学
冶金
工程类
物理
有机化学
电解质
量子力学
生物化学
作者
Liang Fang,Yanping Xie,Ya Yang,Boya Zhu,Yueyue Wang,Mingxin Liu,Kangning Zhao,Hongbin Zhao,Jiujun Zhang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2019-12-09
卷期号:3 (1): 309-318
被引量:26
标识
DOI:10.1021/acsaem.9b01562
摘要
The development of an efficient electrocatalyst for the hydrogen evolution reaction (HER) in alkaline media is of vital importance to water electrolysis. Herein, a facile surface reconstruction strategy of microwave radiation oxidation is reported to fabricate cobalt phosphide (CoP) multishelled hollow spheres with an amorphous cobalt oxide (CoOx) species coating layer (denoted as CoP@CoOx). The synergistic effect between multishelled hollow-structured CoP and amorphous CoOx can trigger strong electronic modulation on the heterointerface, leading to the increased electrochemical active surface area, the improved charge transfer, and the modification of the electronic structure. As a result, the significant improvements in the catalytic activity, long-term stability, and efficiency are achieved compared with pristine CoP. Especially, the CoP@CoOx composite by microwave radiation oxidation for 6 min on nickel foam (NF) displays significantly enhanced HER activity with a low overpotential of 35 mV at a current density of 10 mA cm–2 and, even more remarkably, of 109 mV at ultrahigh current density of 100 mA cm–2. The concept of interfacial electronic modulation by surface reconstruction can offer a unique approach for the rational design of hydrogen evolution catalysts and beyond.
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