Electrochemical sulfidation of WS2 nanoarrays: strong dependence of hydrogen evolution activity on transition metal sulfide surface composition

Daniel Escalera-López, Ross Griffin, Mark Isaacs, Karen Wilson, Richard E. Palmer, Neil V. Rees*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The activity of transition metal sulfides for the hydrogen evolution reaction (HER) can be increased by sulfur-enrichment of active metal-sulfide sites. In this report, we investigate the electrochemical sulfidation of atmospherically aged WS2 nanoarrays with respect to enhancing HER activity. In contrast to MoS2, it is found that sulfidation diminishes HER activity. Electrochemical and XPS experiments suggest the involvement of insoluble tungsten oxides in the altered HER and electron transfer properties. This demonstrates the strong dependence of the transition metal dichalcogenide (TMD) composition with the successful sulfur incorporation and subsequent HER activity.

Original languageEnglish
Pages (from-to)106-111
Number of pages6
JournalElectrochemistry Communications
Volume81
Early online date16 Jun 2017
DOIs
Publication statusPublished - 1 Aug 2017

Bibliographical note

© 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).

Funding: EPSRC (EP/L015749/1 and EP/G037116/1)).

Keywords

  • hydrogen evolution
  • nanoarrays
  • sulfidation
  • transition metal dichalcogenides
  • tungsten disulfide

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