Enhanced catalytic activity in strained chemically exfoliated WS 2 nanosheets for hydrogen evolution

Damien Voiry, Hisato Yamaguchi, Junwen Li, Rafael Silva, Diego C B Alves, Takeshi Fujita, Mingwei Chen, Teddy Asefa, Vivek B. Shenoy, Goki Eda, Manish Chhowalla

Research output: Contribution to journalArticle

1434 Citations (Scopus)

Abstract

Efficient evolution of hydrogen through electrocatalysis at low overpotentials holds tremendous promise for clean energy. Hydrogen evolution can be easily achieved by electrolysis at large potentials that can be lowered with expensive platinum-based catalysts. Replacement of Pt with inexpensive, earth-abundant electrocatalysts would be significantly beneficial for clean and efficient hydrogen evolution. To this end, promising results have been reported using 2H (trigonal prismatic) XS 2 (where X=Mo or W) nanoparticles with a high concentration of metallic edges. The key challenges for XS 2 are increasing the number and catalytic activity of active sites. Here we report monolayered nanosheets of chemically exfoliated WS2 as efficient catalysts for hydrogen evolution with very low overpotentials. Analyses indicate that the enhanced electrocatalytic activity of WS2 is associated with the high concentration of the strained metallic 1T (octahedral) phase in the as-exfoliated nanosheets. Our results suggest that chemically exfoliated WS 2 nanosheets are interesting catalysts for hydrogen evolution.

Original languageEnglish
Pages (from-to)850-855
Number of pages6
JournalNature Materials
Volume12
Issue number9
DOIs
Publication statusPublished - Sep 2013

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ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)
  • Medicine(all)

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