NDLI: Engineering stepped edge surface structures of MoS<sub>2</sub> sheet stacks to accelerate the hydrogen evolution reaction

Content Provider	Royal Society of Chemistry (RSC)
Author	Leung, Michael K. H. An, Yiming Wang, Zilong Zhou, Dan Huang, Bolong Hu, Jue Yang, Shihe Lin, He Zhang, Chengxu
Copyright Year	2017
Abstract	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.
Starting Page	593
Ending Page	603
Page Count	11
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	10
Issue Number	2
Journal	Energy & Environmental Science
DOI	10.1039/c6ee03629e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Molybdenum Sulfide Hydrogen Overpotential Exchange current density Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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