Nickel sulfide-based electrocatalysts for overall water splitting |
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| Affiliation: | 1. School of Safety Science & Engineering, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an, 710054, Shaanxi, PR China;3. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;4. Gas and Heat Technology, Institute of Thermal Engineering, Technical University Bergakademie Freiberg, Gustav-Zeuner-Straße 7, 09599 Freiberg, Germany;1. Department of Chemistry, College of Sciences, Northeastern University, Box 332, Shenyang 110819, China;2. Ansteel Beijing Research Institute Co., LTD. Beijing 102211, China;1. Institute of Nano Science and Nano Technology, University of Kashan, Kashan, P. O. Box.87317-51167, Iran;2. Nonlinear Dynamic Research Center (NDRC), College of Humanities and Sciences, Ajman University, P.O. Box 346, Ajman, United Arab Emirates;1. Ustinov Baltic State Technical University “VOENMEH”, 1 Pervaya Krasnoarmeyskaya St., Saint Petersburg, 190005, Russia;2. Saint Petersburg State University of Architecture and Civil Engineering, 4 Vtoraya Krasnoarmeyskaya St., Saint Petersburg, 190005, Russia;1. Instituto de Química, Universidade Federal de Goiás (UFG), Av. Esperança s/n, Campus Samambaia, Goiânia, 74690-900, Goiás, Brazil;2. Instituto Federal de Goiás (IFG), Rua 75, nº 46, Goiânia, 74055-110, Goiás, Brazil |
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| Abstract: | Hydrogen is a green energy with sustainability and high energy density. Electrochemical water splitting (EWS) is a promising green strategy for hydrogen production. Noble metal electrocatalysts exhibit excellent electrocatalytic activity in EWS. However, the applications of noble metals in EWS are limited because of their scarcity and high price. Therefore, the research on non-noble metal electrocatalysts has attracted much attention. Among them, nickel sulfide electrocatalysts, with a unique 3D structure, pretty conductivity, and adjustable electronic structure, show significant electrocatalytic activity in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In this review, the mechanism of the electrocatalytic reaction, electrochemical parameters, and preparation methods of nickel sulfide are introduced first. Then, the five methods including atomic doping (including cations, anions and diatoms), morphological control, hybridization, integration with nanocarbon, and high-index facets exposure to regulate the electronic structure and active sites of nickel sulfide were illustrated, so as to improve the electrocatalytic activity of nickel sulfide. The electrocatalytic properties of these nickel sulfides were reviewed. However, there are some problems in the research of electrocatalysis, such as how to further improve the conductivity of the electrocatalyst, and the calculation method of current density is not unified. Therefore, our future development direction is to prepare a stable nickel sulfide electrocatalyst, study relevant strategies to simultaneously increase active sites and improve conductivity, and effectively make nickel sulfide into an EWS catalyst with higher performance. |
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| Keywords: | Nickel sulfide Electrocatalytic overall water splitting Hydrogen evolution reaction Oxygen evolution reaction Modification methods |
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