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Atomic Arrangement in Metal‐Doped NiS 2 Boosts the Hydrogen Evolution Reaction in Alkaline Media
Author(s) -
Yin Jie,
Jin Jing,
Zhang Hong,
Lu Min,
Peng Yong,
Huang Bolong,
Xi Pinxian,
Yan ChunHua
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201911470
Subject(s) - overpotential , dopant , electron transfer , doping , materials science , water splitting , selectivity , hydrogen , transition metal , chemical physics , metal , nanotechnology , chemistry , catalysis , optoelectronics , electrochemistry , electrode , metallurgy , biochemistry , organic chemistry , photocatalysis
We report a novel modulation strategy by introducing transition metals into NiS 2 nanosheets (NSs) to flexibly optimize the electronic configurations and atomic arrangement. The Co‐NiS 2 NSs exhibit excellent hydrogen evolution reaction (HER) performance with an overpotential of 80 mV at j =10 mA cm −2 and long‐term stability of 90 h in alkaline media. The turnover frequencies (TOFs) of 0.55 and 4.1 s −1 at an overpotential of 100 and 200 mV also confirm their remarkable performance. DFT calculations reveal that the surface dopants abnormally sensitize surface Ni‐3d bands in the long‐range order towards higher electron‐transfer activity, acting as the electron‐depletion center. Meanwhile, the high lying surface S‐sites possess substantially high selectivity for splitting the adsorbing H 2 O that guarantee the high HER performance within alkaline conditions. This work opens opportunities for enhancing water splitting by atomic‐arrangement‐assisted electronic modulation via a facile doping strategy.