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Engineering Stepped Edge Surface Structures of MoS2 Sheet Stacks to Accelerate the Hydrogen Evolution Reaction

Authors Hu, Jue HKUST affiliated (currently or previously).
Huang, Bolong
Zhang, Chengxu
Wang, Zilong HKUST affiliated (currently or previously)
An, Yiming HKUST affiliated (currently or previously)
Zhou, Dan HKUST affiliated (currently or previously)
Lin, He HKUST affiliated (currently or previously)
Leung, Michael K. H.
Yang, Shihe View this author's profile
Issue Date 2017
Source Energy and Environmental Science , v. 10, (2), February 2017, p. 593-603
Summary Two-dimensional molybdenum sulfide is an attractive noble-metal-free electrocatalyst for the hydrogen evolution reaction (HER). Significant efforts have been made to increase the number of exposed edge sites. However, little attention has been paid to devising edge surface structures of MoS2 sheet stacks to promote the HER kinetics. Herein we report the first demonstration of significantly enhanced HER kinetics by controllably fabricating a stepped MoS2 surface structure. Vertical arrays of MoS2 sheets terminated with such a stepped surface structure have proved to be an outstanding HER electrocatalyst with an overpotential of 104 mV at 10 mA cm(-2), an exchange current density of 0.2 mA cm(-2) and high stability. Experimental and theoretical results indicate that the enhanced electrocatalytic activity of the vertical MoS2 arrays is associated with the unique vertically terminated, highly exposed, stepped surface structure with a nearly thermoneutral H-adsorption energy. This work opens a new avenue to designing and developing layered materials for electrochemical energy applications.
ISSN 1754-5692
Language English
Format Article
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