Chinese Journal of Catalysis ›› 2025, Vol. 72: 230-242.DOI: 10.1016/S1872-2067(24)60286-X

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Ultra-high overpotential induces NiS2 deep reconstruction to significantly improve HER performance

Chao Fenga,b,1, Jiaxin Shaoa,1, Hanyang Wua, Afaq Hassanc, Hengpan Yanga, Jiaying Yud,*(), Qi Hua,*(), Chuanxin Hea,*()   

  1. aCollege of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
    bSchool of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi University, Shihezi 832003, Xinjiang, China
    cDepartment of Chemical Engineering and Technology, Faculty of Chemical Sciences, Gdańsk University of Technology, Gdansk 80-233, Poland
    dCollege of Integrated Circuits and Optoelectronic Chips, Shenzhen Technology University, Shenzhen 518118, Guangdong, China
  • Received:2024-12-09 Accepted:2025-02-08 Online:2025-05-18 Published:2025-05-20
  • Contact: *E-mail: yujiaying@sztu.edu.cn (J. Yu), hq2016@szu.edu.cn (Q. Hu), hecx@szu.edu.cn (C. He).
  • About author:1Contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(U21A20312);National Natural Science Foundation of China(22379100);National Natural Science Foundation of China(22309115);Shenzhen Science and Technology Program(20231121200418001);Guangdong Basic and Applied Basic Research Foundation(2022B1515120084);Key Project of Department of Education of Guangdong Province(2023ZDZX3020);Tianchi Talent Program (Young Doctoral Program) of Xinjiang Uygur Autonomous Region(2025)

Abstract:

It is well known that transition metal sulfides (TMS) (i.e., NiS2) undergo electrochemical reconstructions to generate highly active Ni3S2 during the process of hydrogen evolution reaction (HER) under overpotentials of < 500 mV. However, at higher overpotentials, Ni3S2 can theoretically be further restructured into Ni and thus form Ni/Ni3S2 heterogeneous interface structures, which may provide opportunities to further enhance HER activity of NiS2. Here, we selected NiS2 as a model electrocatalyst and investigated the influence of the reconstruction results induced from regular to ultrahigh overpotentials on its electrocatalytic hydrogen precipitation performance. The experimental results showed that the most significant enhancement of hydrogen precipitation performance was obtained for the NiS2@CC-900 (900 means 900 mV overpotential) sample after the ultra-high overpotential induced reconstruction. Compared with the initial overpotential of 161 mV (10 mA cm-2), the overpotential of the reconstructed sample reduced by 67 mV (42%). The characterization results showed that an ultra-high overpotential of 900 mV induced deep reconstruction of NiS2, formed highly reactive Ni/Ni3S2 heterogeneous interfaces, which is more conducive to improved HER performance and match well with theoretical calculations results. We demonstrated ultrahigh overpotential was an effective strategy to induce NiS2 deeply reconstruction and significantly improve its HER performance, and this strategy was also applicable to CoS2 and FeS2. This study provides an extremely simple and universal pathway for the reasonable construction of efficient electrocatalysts by induced TMS deeply reconstruction.

Key words: Nickel sulfide, Ultra-high overpotential induces, Deep reconstruction, Synergistic effect, Hydrogen evolution reaction