| Hydrogen is cited as one of the most ideal energy sources for the 21st century.The relatively high overpotential and huge energy consumption remain an obstacle to obtain a more strengthened HER catalytic activity.Molybdenum disulfide（Mo S2）is considered as an ideal substitute for platinum-based catalysts with its low price and excellent electrocatalytic performance in the hydrogen evolution reaction（HER）.However,the catalytic activity of pure Mo S2 for HER still fails to meet the practical requirements.Single atom catalysts（SACs）have been intensively studied due to their maximum atomic efficiency and unique electronic structures.Single atoms have been successfully stabilized on Mo S2,and led to interesting modifications in electronic structures and crystalline phase and visible improvement in catalytic activity.In this experiment,single-atom Co modified metallic phase Mo S2（1T-Mo S2）and single-atom Ni modified 1T-Mo S2 were synthesized by one-step solver-thermal method.The experimental results were fed back by HAADF-STEM and Raman detection methods.The overpotential of 10Co@1T-Mo S2catalyst prepared at 200℃in 0.5 M H2SO4 was as low as 178 m V when the reference current density was-10 m A/cm2,which was 46 m V lower than that of 1T-Mo S2（224 m V）synthesized under the same condition.The Tafel slope is as low as 67 m V/dec,which is reduced by 73 m V/dec compared with the 1T-Mo S2（140 m V/dec）synthesized under the same conditions.The 20Ni@1T-Mo S2 catalyst prepared at 240℃has a lower overpotential of195 m V at the current density of-10 m A/cm2,which is 53 m V lower than that of the 1T-Mo S2（248 m V）synthesized under the same conditions,and its Tafel slope is 162 m V/dec.Compared with the 1T-Mo S2（270 m V/dec）synthesized under the same conditions,108m V/dec is reduced.This work was demonstrated to be effective to further enhance the HER catalytic activity of Mo S2 and should be of visible importance on the development of hydrogen production technology as well as addressing the energy crisis. |
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