Engineering stepped edge surface structures of MoS2sheet stacks to accelerate the hydrogen evolution reaction

Jue Hu, Bolong Huang, Chengxu Zhang, Zilong Wang, Yiming An, Dan Zhou, He Lin, Michael K.H. Leung, Shihe Yang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

189 Citations (Scopus)

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 MoS2sheet stacks to promote the HER kinetics. Herein we report the first demonstration of significantly enhanced HER kinetics by controllably fabricating a stepped MoS2surface structure. Vertical arrays of MoS2sheets 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-2and high stability. Experimental and theoretical results indicate that the enhanced electrocatalytic activity of the vertical MoS2arrays 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.
Original languageEnglish
Pages (from-to)593-603
Number of pages11
JournalEnergy and Environmental Science
Volume10
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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