Efficient hydrogen production on MoNi4 electrocatalysts with fast water dissociation kinetics

Nature Communications
Jian ZhangXinliang Feng

Abstract

Various platinum-free electrocatalysts have been explored for hydrogen evolution reaction in acidic solutions. However, in economical water-alkali electrolysers, sluggish water dissociation kinetics (Volmer step) on platinum-free electrocatalysts results in poor hydrogen-production activities. Here we report a MoNi4 electrocatalyst supported by MoO2 cuboids on nickel foam (MoNi4/MoO2@Ni), which is constructed by controlling the outward diffusion of nickel atoms on annealing precursor NiMoO4 cuboids on nickel foam. Experimental and theoretical results confirm that a rapid Tafel-step-decided hydrogen evolution proceeds on MoNi4 electrocatalyst. As a result, the MoNi4 electrocatalyst exhibits zero onset overpotential, an overpotential of 15 mV at 10 mA cm-2 and a low Tafel slope of 30 mV per decade in 1 M potassium hydroxide electrolyte, which are comparable to the results for platinum and superior to those for state-of-the-art platinum-free electrocatalysts. Benefiting from its scalable preparation and stability, the MoNi4 electrocatalyst is promising for practical water-alkali electrolysers.

References

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Citations

Mar 1, 2018·Chemical Communications : Chem Comm·Jia LiuZia Ul Haq Khan
Jan 16, 2018·Advanced Materials·Lvlv JiChi Zhang
May 29, 2018·Advanced Materials·Qizhong XiongHuijun Zhao
May 15, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Wei-Liang LiWen-Feng Liaw
Jun 20, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Wenguang XiYangguang Li
Jul 26, 2018·Advanced Materials·Jian ZhangXinliang Feng
Mar 7, 2019·Advanced Materials·Jian ZhangXinliang Feng
May 29, 2020·Chemical Communications : Chem Comm·Dongdong ZhuJinlong Liu
Sep 17, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Feixiang JiaoXiaofei Jing

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Methods Mentioned

BETA
X-ray
scanning electron microscopy
transmission electron microscopy
electron diffraction

Software Mentioned

VASP
Vienna Ab Initio Simulation Package

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