Enhancing Hydrogen Evolution Performance of a Regular Cube NiCu Nanocrystalline Electrocatalyst Fabricated by Normal Pluse Electrodeposition †

doi:10.7503/cjcu20200082

Abstract

Abstract:

Herein, a regular cube structured nickel-copper alloy electrocatalyst on nickel foam(NF) with phase-separated metallic Ni and Cu as the main crystal phase, and the average particle size of 70 nm, denoted as NiCu/NF, was prepared by normal pluse voltammetry. The as-obtained catalyst displays superior electroca-talytic activity towards hydrogen evolution reaction(HER), requiring an overpotential of merely 86 mV to afford 10 mA/cm ² current density in 1 mol/L KOH. Moreover, NiCu/NF exhibits remarkable stability with a potential fluctuation of merely 12 mV during a 24 h continuous HER electrolysis. As a result, the two-stage composite cube-nanocrystalline structure gives rise to the 14.5-fold increased electrochemical active surface area(ECSA), exposing a huge number of catalytic active sites for HER, providing sufficient channels for charge transfer and material transfer on the electrode surface. On the other hand, the strong synergistic effect induced by Cu-introduction and the formation of NiO/Ni heterojunction brings prominent improvement of intrinsic HER activity of electrode materials via alteration of the electronic property of the adjacent Ni atoms. The three factors contribute collectively to the superior electrocatalytic performances of NiCu/NF electrode towards HER. Meanwhile, NiCu/NF electrode follows the Volmer-Heyrovsky mechanism with the reaction rate determined by the electrochemical desorption of hydrogen adsorbent on the electrode surface during HER. This study provides a new perspective for multi-structural nanoscale synthesis and promotes the development of NiCu-based electrode materials in energy conversion applications.

Key words: Normal pluse electrodeposition, Nickel-copper alloy, Cube-nanocrystalline, Hydrogen evolution reaction

CLC Number:

TrendMD:

SUN Qiangqiang, CAO Baoyue, ZHOU Chunsheng, ZHANG Guochun, WANG Zenglin. Enhancing Hydrogen Evolution Performance of a Regular Cube NiCu Nanocrystalline Electrocatalyst Fabricated by Normal Pluse Electrodeposition ^†[J]. Chem. J. Chinese Universities, 2020, 41(6): 1287.

Figures/Tables 6

References 42

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