You are here

Enhanced catalytic activity in strained chemically exfoliated WS2 nanosheets for hydrogen evolution

TitleEnhanced catalytic activity in strained chemically exfoliated WS2 nanosheets for hydrogen evolution
Publication TypeJournal Article
Year of Publication2013
AuthorsVoiry, Damien, Yamaguchi Hisato, Li Junwen, Silva Rafael, Alves Diego C. B., Fujita Takeshi, Chen Mingwei, Asefa Tewodros, Shenoy Vivek B., Eda Goki, and Chhowalla Manish
JournalNature Materials
Volume12
Pagination850–855
Date Published07/2013
ISSN1476-1122
KeywordsElectrocatalysis
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) {XS2} (where X = Mo or W) nanoparticles with a high concentration of metallic edges. The key challenges for {XS2} 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 {WS2} nanosheets are interesting catalysts for hydrogen evolution.

URLhttp://www.nature.com/nmat/journal/v12/n9/full/nmat3700.html
DOI10.1038/nmat3700

Theme inspired by Danetsoft