Hierarchical NiOx nanotube arrays/CoP nanosheets heterostructure enables robust alkaline hydrogen evolution reaction

被引:11
|
作者
Zai, Shi Feng [1 ]
Wu, Yu Han [1 ]
Zhou, Yi Tong [2 ]
Li, Zhao Tian Hui [3 ]
Bin Guo, Chun [1 ]
机构
[1] Liaoning Tech Univ, Dept Mat Sci & Engn, Fuxin 123000, Peoples R China
[2] Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China
[3] Liaoning Yingguan Hightech Ceram Co Ltd, Jinzhou 121213, Liaoning, Peoples R China
关键词
Hierarchical structure; Hydrogen evolution reaction; Ultrathin nanosheets; Self-supported electrode; DFT simulations; HIGH-EFFICIENCY; ELECTROCATALYSTS; OXYGEN; CATALYSTS; MOS2; ELECTRODES; DESIGN;
D O I
10.1016/j.jcis.2023.04.043
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
Rational design of low-cost and high-efficiency electrocatalysts for hydrogen evolution reaction (HER) is critical for scalable and sustainable hydrogen production from economical water-alkali splitting. Herein, density functional theory (DFT) calculations reveal that coupling NiOx and CoP could effectively boost overall HER kinetics through lowing the H2O dissociation barrier, accelerating the OH* transfer process, and providing the rapid H* migration kinetics as well as the appropriate H* energetics. Based on these findings, we successfully prepared a three-dimensional (3D) self-supported electrode of ultrathin CoP nanosheets directly grown on the surfaceoxidized Ni nanotube arrays via a simple and scalable electrochemical synthesis method. As expected, such a heterostructure electrode exhibits superior alkaline HER performance with low overpotentials of 51 and 164 mV to drive the current densities of 10 and 500 mA cm-2, respectively, outperforming most of the efficient alkaline HER electrocatalysts.
引用
收藏
页码:350 / 359
页数:10
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