Journal
SUSTAINABLE ENERGY & FUELS
Volume 5, Issue 13, Pages 3428-3435Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1se00702e
Keywords
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Funding
- Qingdao Science and Technology Benefiting People Special Project [20-3-4-8-nsh]
- Fundamental Research Funds for the Central Universities [20CX02212A]
- Postgraduate Innovation Engineering Project of China University of Petroleum (East China) [YCX2021134]
- Development Fund of the State Key Laboratory of Heavy Oil Processing
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Transition-metal sulfides, particularly nickel sulfide, have shown great potential as cost-effective catalysts for the hydrogen evolution reaction (HER). In this study, a three-dimensional Ni3S2 film supported by Ag nanorods on Ni foam was developed as an electrocatalyst for HER, exhibiting low overpotential and good stability. The strong interactions between Ag and Ni3S2 in the electrocatalyst promote water adsorption and activation, enhance H adsorption and desorption, and reduce the formation of sulfur-hydrogen bonds on the catalyst surfaces.
Transition-metal sulfides (MxSy) have attracted great interest as promising catalysts for the hydrogen evolution reaction (HER) due to their low cost. However, the formation of sulfur-hydrogen bonds on MxSy (S-H-ads) severely suppresses the HER. In this paper, we report a three-dimensional nickel sulfide (Ni3S2) film supported by Ag nanorods (NRs) on Ni foam (Ni3S2-Ag/NF) as a type of electrocatalyst for the HER in alkaline media. The tight coupling between Ag and Ni3S2 creates a mass of heterojunctions. Therefore, this electrocatalyst only shows a low overpotential of 161 mV at 10 mA cm(-2), as well as satisfactory stability for 10 h. Density functional theory calculations reveal that the intense electronic interactions in the heterojunctions of the Ni3S2-Ag hybrids can facilitate water adsorption and activation, improve H-adsorption and desorption on the electrocatalysts, and reduce the formation of S-H-ads bonds on the catalyst surfaces. The existence of strong interactions between Ag and Ni3S2 in the electrocatalyst can facilitate both the Volmer and Heyrovsky steps of the HER and cause the Ni3S2-Ag/NF electrocatalysts to exhibit outstanding HER catalytic performance. This suitable strategy involving Ag doping may be a promising choice for developing Ni sulfide-based electrocatalysts for the HER.
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