N-doped Ni-Mo based sulfides for high-efficiency and stable hydrogen evolution reaction

[Display omitted] •N-doped Ni-Mo based sulfide cuboid arrays have been successfully synthesized.•Systematical studies confirm N doping regulates electronic structure of NiMoS.•N-NiMoS possesses a low overpotential of 68 mV at 10 mA cm−2 for HER.•N-NiMoS displays excellent stability over 1000-h HER o...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-11, Vol.276, p.119137, Article 119137
Main Authors: Huang, Chuqiang, Yu, Luo, Zhang, Wei, Xiao, Qin, Zhou, Jianqing, Zhang, Yuanlu, An, Pengfei, Zhang, Jing, Yu, Ying
Format: Article
Language:English
Subjects:
Arrays
Catalysts
Catalytic activity
Current density
Electron density
Electron transfer
Electron transport
Hydrogen evolution reaction
Hydrogen evolution reactions
Metal foams
Metal sulfides
Molybdenum
N doping
Ni-Mo based sulfides
Nickel
Stability
Sulfide
Sulfides
Transition metals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •N-doped Ni-Mo based sulfide cuboid arrays have been successfully synthesized.•Systematical studies confirm N doping regulates electronic structure of NiMoS.•N-NiMoS possesses a low overpotential of 68 mV at 10 mA cm−2 for HER.•N-NiMoS displays excellent stability over 1000-h HER operation. Transition-metal sulfides (TMS) have been widely studied for electrocatalytic hydrogen evolution reaction (HER). Nevertheless, the HER activity is still far lower than the benchmark Pt-based materials due to the sparse exposed active sites, poor electron transfer and unsatisfying stability of TMS. In this work, we have successfully prepared N-doped Ni-Mo based sulfide cuboid arrays on Ni foam (denoted as N-NiMoS) towards high-efficiency and long-term HER. Systematic investigations confirm that N doping effectively regulates the electron density and tunes d-band center of NiMoS, which facilitate electron transport and improve electronic conductivity. Additionally, the hierarchical N-NiMoS cuboid arrays present larger surface area with more exposed active sites, thus endowing our catalyst with excellent HER catalytic activity with low overpotentials of 68, 250, and 322 mV at current densities of 10, 500, and 1000 mA cm−2, respectively. Impressively, the N-NiMoS electrode also displays superior stability, with a unattenuated current density over 1000-h HER operation.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119137