摘要
Creating vacancy is often highly effective in enhancing the hydrogen evolution performance of transition metal-based catalysts.Vacancy-rich Ni nanosheets have been fabricated via topochemical formation of two-dimentional(2D)Ni_(2)B on graphene precursor followed by boron leaching.Anchored on graphene,a few atomic layered Ni_(2)B nanosheets are first obtained by reduction and annealing.Large number of atomic vacancies are then generated in the Ni_(2)B layer via leaching boron atoms.When used for hydrogen evolution reaction(HER),the vacancy-rich Ni/Ni(OH)_(2 )heterostructure nanosheets demonstrate remarkable performance with a low overpotential of 159 mV at a current density of 10 mA·cm^(−2) in alkaline solution,a dramatic improvement over 262 mV of its precursor.This enhancement is associated with the formation of vacancies which introduce more active sites for HER along Ni/Ni(OH)_(2) heterointerfaces.This work offers a facile and universal route to introduce vacancies and improve catalytic activity.
基金
Acknowledgements Z.H.acknowledges support under the Australian Research Council’s Future Fellowship(No.FT190100658)
This work is partially supported by the Australian Research Council(ARC)through a Discovery project(No.DP180101453).
