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Design of MoS2/Graphene van der Waals Heterostructure as Highly Efficient and Stable Electrocatalyst for Hydrogen Evolution in Acidic and Alkaline Media
journal contribution
posted on 2020-05-22, 20:06 authored by Xianbo Yu, Guangyu Zhao, Shan Gong, Chao Liu, Canlong Wu, Pengbo Lyu, Guillaume Maurin, Naiqing ZhangThe
thermodynamically stable phase of molybdenum disulfide (MoS2) is evaluated as a promising and durable nonprecious-metal
electrocatalyst toward the hydrogen evolution reaction (HER); however,
its actual catalytic activity is restricted by an inert basal plane,
low electronic conductivity, low density, and using efficiency of
edged atoms. Moreover, 2D/2D van der Waals (vdws) heterostructures
(HSs) with face-to-face contact can construct a highly coupled interface
and are demonstrated to have immense potential for catalytic applications.
In the present work, a 2D/2D hetero-layered architecture of an electrocatalyst,
based on the alternate arrangement of ultrasmall monolayer MoS2 nanosheets (approximately 5–10 nm) and ultrathin graphene
(G) sheets, is prepared by a facilely chemical process, which is named
as MoS2/G HS. The unique structural characteristic of MoS2/G HS is in favor of accommodating more active sites as the
centers of ad/desorption hydrogen and transferring and separating
the charges at a coupled interface to improve the electronic conductivity
and durability. The density functional theory calculation results
further confirm that the alternately arranged G layers and MoS2 monolayers, as well as the expanded interplanar distance
of 1.104 nm for MoS2/G HS, can exhibit a superior HER performance
in both 0.5 M H2SO4 and 1.0 M KOH.
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1.104 nmnonprecious-metal electrocatalystHSHER performanceG layersMoS 21.0 M KOHhydrogen evolution reactionultrasmall monolayer MoS 2 nanosheetsultrathin grapheneAlkaline Mediainterplanar distanceMoS 2 monolayersmolybdenum disulfide0.5 M H 2theory calculation resultsbasal planeStable ElectrocatalystHydrogen Evolutionfacilely chemical process
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