Journal
NANO LETTERS
Volume 13, Issue 12, Pages 6222-6227Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403661s
Keywords
Layered materials; MoS2; chemical exfoliation; layered transition metal dichalcogenide; hydrogen evolution reaction
Categories
Funding
- NSF [DGE 0903661, CAREER CHE-1004218, DMR-0968937, NanoEHS-1134289]
- NRF Singapore
- Army Research Office [W911NF-11-1-0171]
- NSF (NSF-ACIF)
- NSF (Special Creativity Grant)
- JST-PRESTO
- JSPS [24656028]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0968937] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1235870] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1128335] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [24656028] Funding Source: KAKEN
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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 IT 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, IT 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.
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