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CoP@Ni core-shell heterostructure nanowire array: A highly efficient electrocatalyst for hydrogen evolution
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DOI：10.1016/j.jcis.2023.01.108.png)
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摘要
En 中文
The inferior performance of non-precious metals on electrocatalytic hydrogen evolution can be mainly attributed to the inappropriate adsorption strength of intermediates. A core-shell heterostructure of CoP@Ni is developed by hydrothermal reaction, thermal phosphorization and subsequent electrodeposi-tion, with metallic Ni supported by CoP nanowire array. The as-prepared CoP@Ni core-shell heterostruc-ture nanowire array has a superior activity on hydrogen evolution in alkaline electrolyte, with an overpotential of 71 mV to drive 10 mA cm(-2) and a Tafel slope of 66 mV dec(-1). The electronic structure of CoP@Ni is tuned for modulating the adsorption strength of intermediates. The theoretical calculations reveal that CoP@Ni has metallic characteristics with a zero-bandgap, which leads to the promoted charge transfer. More importantly, the intrinsic activity of CoP@Ni is greatly increased, with a lower energy bar-rier in the reaction pathway. This work points out the importance of constructing the heterostructure for improving the intrinsic activity, which can pave the way to the exploration of high-performance and cost-effective electrocatalysts for hydrogen production. (c) 2023 Elsevier Inc. All rights reserved.
Keyword:
Hydrogen evolution reaction
Intrinsic activity
Electrocatalyst
Heterostructure
期刊
IF:
9.7
论文数:
3.7W
被引数:
14.7W
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