Constructing three-dimensional porous Ni/Ni3S2nano-interfaces for hydrogen evolution electrocatalysis under alkaline conditions

Yiming An, Bolong Huang, Zilong Wang, Xia Long, Yongcai Qiu, Jue Hu, Dan Zhou, He Lin, Shihe Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)

Abstract

It is still a challenging issue to design earth-abundant electrocatalysts with low cost, high activity and long-term stability for the hydrogen evolution reaction (HER) based on water splitting in alkaline solutions. Here, we report a facile synthetic route for a three-dimensional, porous Ni/Ni3S2nano-network on carbon cloth for the efficient catalysis of HER. This unique structure exposes a high proportion of Ni/Ni3S2hetero-interfaces to the electrolyte, creating a synergetic effect between Ni and Ni3S2that enhances HER. The synergetic effect at the interface was verified by DFT calculation and involves the interface-assisted heterolytic splitting of H2O into OH-and H+and the subsequent expeditious H2-forming reaction caused by weakened binding between Ni and H induced by the neighboring Ni3S2. The resulting porous network shows high HER activity in alkaline media, reaching 10 mA cm-2at 95 mV with a Tafel slope of 66 mV dec-1. This value is much smaller than that of nickel metal, which is currently used in industry.
Original languageEnglish
Pages (from-to)10700-10706
Number of pages7
JournalDalton Transactions
Volume46
Issue number32
DOIs
Publication statusPublished - 1 Jan 2017

ASJC Scopus subject areas

  • Inorganic Chemistry

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