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

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.

Publication DOI: https://doi.org/10.1016/j.elecom.2017.06.016
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Chemical Engineering & Applied Chemistry
Engineering & Applied Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: © 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)).
Uncontrolled Keywords: hydrogen evolution,nanoarrays,sulfidation,transition metal dichalcogenides,tungsten disulfide,Electrochemistry
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-08-01
Published Online Date: 2017-06-16
Accepted Date: 2017-06-15
Submitted Date: 2017-06-15
Authors: Escalera-López, Daniel
Griffin, Ross
Isaacs, Mark
Wilson, Karen ( 0000-0003-4873-708X)
Palmer, Richard E.
Rees, Neil V.

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