Conducting MoS2 nanosheets as catalysts for hydrogen evolution reaction

Damien Voiry, Maryam Salehi, Rafael Silva, Takeshi Fujita, Mingwei Chen, Tewodros Asefa, Vivek B. Shenoy, Goki Eda, Manish Chhowalla

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1139 Citations (Scopus)

Abstract

We report chemically exfoliated MoS2 nanosheets with a very high concentration of metallic 1T phase using a solvent free intercalation method. After removing the excess of negative charges from the surface of the nanosheets, highly conducting 1T phase MoS2 nanosheets exhibit excellent catalytic activity toward the evolution of hydrogen with a notably low Tafel slope of 40 mV/dec. By partially oxidizing MoS2, we found that the activity of 2H MoS2 is significantly reduced after oxidation, consistent with edge oxidation. On the other hand, 1T MoS2 remains unaffected after oxidation, suggesting that edges of the nanosheets are not the main active sites. The importance of electrical conductivity of the two phases on the hydrogen evolution reaction activity has been further confirmed by using carbon nanotubes to increase the conductivity of 2H MoS2.

Original languageEnglish
Pages (from-to)6222-6227
Number of pages6
JournalNano letters
Volume13
Issue number12
DOIs
Publication statusPublished - Dec 11 2013

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Keywords

  • Layered materials
  • MoS
  • chemical exfoliation
  • hydrogen evolution reaction
  • layered transition metal dichalcogenide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Voiry, D., Salehi, M., Silva, R., Fujita, T., Chen, M., Asefa, T., Shenoy, V. B., Eda, G., & Chhowalla, M. (2013). Conducting MoS2 nanosheets as catalysts for hydrogen evolution reaction. Nano letters, 13(12), 6222-6227. https://doi.org/10.1021/nl403661s