Journal
NATURE MATERIALS
Volume 12, Issue 9, Pages 850-855Publisher
NATURE RESEARCH
DOI: 10.1038/NMAT3700
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Funding
- NSF [DGE 0903661, CAREER CHE-1004218, DMR-0968937, NanoEHS-1134289]
- Japan Society for the Promotion of Science (JSPS)
- NRF Singapore
- Army Research Office [W911NF-11-1-0171]
- NSF-ACIF
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0968937] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1235870] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1134289] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [24656028] Funding Source: KAKEN
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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.
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