title: Facile Synthesis of Vanadium-Doped Ni3S2Nanowire Arrays as Active Electrocatalyst for Hydrogen Evolution Reaction.
abstract: Ni3S2nanowire arrays doped with vanadium(V) are directly grown on nickel foam by a facile one-step hydrothermal method. It is found that the doping can promote the formation of Ni3S2nanowires at a low temperature. The doped nanowires show excellent electrocatalytic performance toward hydrogen evolution reaction (HER), and outperform pure Ni3S2and other Ni3S2-based compounds. The stability test shows that the performance of V-doped Ni3S2nanowires is improved and stabilized after thousands of linear sweep voltammetry test. The onset potential of V-doped Ni3S2nanowire can be as low as 39 mV, which is comparable to platinum. The nanowire has an overpotential of 68 mV at 10 mA cm-2, a relatively low Tafel slope of 112 mV dec-1, good stability and high Faradaic efficiency. First-principles calculations show that the V-doping in Ni3S2extremely enhances the free carrier density near the Fermi level, resulting in much improved catalytic activities. We expect that the doping can be an effective way to enhance the catalytic performance of metal disulfides in hydrogen evolution reaction and V-doped Ni3S2nanowire is one of the most promising electrocatalysts for hydrogen production.
authors.affiliation: Institute of Applied Physics and Materials Engineering, University of Macau , Macao SAR, P. R. China.|Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau , Macao SAR, P. R. China.
authors.forename: Yuanju
authors.initials: Y
authors.lastname: Qu
authors.affiliation: Institute of Applied Physics and Materials Engineering, University of Macau , Macao SAR, P. R. China.|Department of Materials Science and Engineering, Shenzhen Key Laboratory of Hydrogen Energy, South University of Science and Technology of China , Shengzhen 518055, Guangdong P. R. China.
authors.forename: Mingyang
authors.initials: M
authors.lastname: Yang
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology, and Research) , #08-03, 2 Fusionopolis Way, Innovis, Singapore 138634.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Chai
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore , Singapore 119077.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Tang
authors.affiliation: Institute of Applied Physics and Materials Engineering, University of Macau , Macao SAR, P. R. China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Shao
authors.affiliation: Institute of Applied Physics and Materials Engineering, University of Macau , Macao SAR, P. R. China.|Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau , Macao SAR, P. R. China.
authors.forename: Chi Tat
authors.initials: CT
authors.lastname: Kwok
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology, and Research) , #08-03, 2 Fusionopolis Way, Innovis, Singapore 138634.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, Shenzhen Key Laboratory of Hydrogen Energy, South University of Science and Technology of China , Shengzhen 518055, Guangdong P. R. China.
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, National University of Singapore , Singapore 119077.
authors.forename: Daniel
authors.initials: D
authors.lastname: Chua
authors.affiliation: Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology, and Research) , #08-03, 2 Fusionopolis Way, Innovis, Singapore 138634.
authors.forename: Shijie
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Shenzhen Key Laboratory of Hydrogen Energy, South University of Science and Technology of China , Shengzhen 518055, Guangdong P. R. China.
authors.forename: Zhouguang
authors.identifier: http://orcid.org/0000-0003-3769-9356
authors.initials: Z
authors.lastname: Lu
authors.affiliation: Institute of Applied Physics and Materials Engineering, University of Macau , Macao SAR, P. R. China.
authors.forename: Hui
authors.identifier: http://orcid.org/0000-0002-6515-4970
authors.initials: H
authors.lastname: Pan
keywords: doping; electrocatalyst; first-principles calculation; hydrogen evolution reaction; transition metal sulfide; water-splitting