Electrocatalytically inactive copper improves the water adsorption/dissociation on Ni3S2 for accelerated alkaline and neutral hydrogen evolution

Lei Zhang; Xiaorui Gao; Ying Zhu; Acan Liu; Huilong Dong; Dajun Wu; Zhida Han; Wei Wang; Yong Fang; Jie Zhang; Zongkui Kou; Bin Qian; Ting-Ting Wang

doi:10.1039/D0NR07275C

Electrocatalytically inactive copper improves the water adsorption/dissociation on Ni₃S₂ for accelerated alkaline and neutral hydrogen evolution†

Lei Zhang,^a Xiaorui Gao,*^a Ying Zhu,^a Acan Liu,^a Huilong Dong,*^a Dajun Wu,

^a Zhida Han,^a Wei Wang,^b Yong Fang,

^a Jie Zhang,^a Zongkui Kou,

^c Bin Qian

*^a and Ting-Ting Wang*^d

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* Corresponding authors

^a Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, P. R. China
E-mail: gxr_1320@sina.com, hldong@cslg.edu.cn, njqb.cslg.edu.cn

^b School of Materials Engineering, Jinling Institute of Technology, Nanjing 211169, P. R. China

^c Department of Materials Science and Engineering, National University of Singapore, 117574 Singapore, Singapore

^d Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
E-mail: tingtingwang@whut.edu.cn

Abstract

Nickel dichalcogenides, especially Ni₃S₂, present inferior alkaline and neutral hydrogen evolution activity due to their sluggish water dissociation kinetics. Although these materials hold promise as non-noble metal-based electrocatalysts for the hydrogen evolution reaction (HER) in acidic media, developing efficient strategies to enhance the water dissociation processes of nickel dichalcogenides in alkaline and neutral solutions is also an important area of research. The present work discloses an electrocatalytically inactive copper doping strategy to promote the water adsorption and dissociation process of Ni₃S₂ (Cu-Ni₃S₂) nanoparticles supported on nickel foam (NF) towards improving the alkaline and neutral hydrogen evolution reactions. Based on combined density functional theory calculations and electrochemical characterizations, the doping of Cu can accelerate the Volmer step and therefore strengthen the water adsorption/dissociation on the respective Ni sites and S sites during the HER process. As a result, the electrocatalyst exhibits superior and stable HER performance in both 1 M KOH and 1 M phosphate-buffered saline (PBS) solutions, with much lower overpotentials of 121 and 228 mV at a current density of 10 mA cm⁻², respectively, in comparison to bare Ni₃S₂. We therefore conclude that the tailored control of the water adsorption/dissociation capability of Ni₃S₂ will open significant opportunities for the rational design of alkaline and neutral electrocatalysts from earth-abundant and stable materials.

Nanoscale

Electrocatalytically inactive copper improves the water adsorption/dissociation on Ni₃S₂ for accelerated alkaline and neutral hydrogen evolution†

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Electrocatalytically inactive copper improves the water adsorption/dissociation on Ni₃S₂ for accelerated alkaline and neutral hydrogen evolution

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