On a Two-Dimensional MoS2/Mo2CTxHydrogen Evolution Catalyst Obtained by the Topotactic Sulfurization of Mo2CTxMXene

Mohamed Benchakar, Varun Natu, Tarek Ali Elmelegy, Maxim Sokol, Joshua Snyder, Clément Comminges, Claúdia Morais, Stéphane Célérier, Aurélien Habrioux, Michel W. Barsoum

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Herein we topotactically reacted sulphur, S, with Mo2CTx MXene powders to synthesize Mo2CTx sheets covered by MoS2 nanosheets and tested the resulting material as a hydrogen evolution reaction, HER, electrocatalyst. As a result, a high electrochemical active surface area catalyst was obtained. It allows driving a current density of 10 mA cm-2 at a low overpotential of only 150 mV. Stabilization of the water activated complex as well as interfacial charge transfer accompanied by changes in the adsorption energy hydrogen are most likely responsible for the high electrochemical activity. Moreover, no efficiency loss was observed under working conditions during 30 h in a 1 mol l-1 KOH electrolyte, confirming the remarkable electrochemical stability of this composite catalyst.

Original languageEnglish
Article number124507
JournalJournal of the Electrochemical Society
Volume167
Issue number12
DOIs
StatePublished - 9 Jan 2020
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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