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A Cake‐Style CoS 2 @MoS 2 /RGO Hybrid Catalyst for Efficient Hydrogen Evolution
Author(s) -
Guo Yaxiao,
Gan Linfeng,
Shang Changshuai,
Wang Erkang,
Wang Jin
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201602699
Subject(s) - tafel equation , graphene , materials science , overpotential , catalysis , oxide , hydrogen , chemical engineering , adsorption , nanotechnology , nanoparticle , inorganic chemistry , electrochemistry , chemistry , electrode , organic chemistry , metallurgy , engineering
A three‐tiered cake‐style composite is elaborately established, with the characteristic of a double‐deck of MoS 2 nanosheets and reduction of graphene oxide (RGO) sheets dotted with CoS 2 nanoparticles (CoS 2 @MoS 2 /RGO). Because of the prominent synergistic effect of graphene acting as conductive support, MoS 2 and CoS 2 providing abundant catalytically active sites, and the cake‐style structure promoting mechanical stability, the CoS 2 @MoS 2 /RGO exhibits a superior hydrogen evolution reaction activity with a small overpotential of 98 mV at cathodic current density of 10 mA cm −2 , and a small Tafel slope of 37.4 mV dec −1 , as well as excellent cycling stability. Density functional theory calculations reveal that the hydrogen adsorption free energy of CoS 2 @MoS 2 /RGO is close to zero.