Journal
NANO LETTERS
Volume 13, Issue 3, Pages 1341-1347Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl400258t
Keywords
Layered materials; MoS2; MoSe2; hydrogen evolution reaction; sulfurization; selenization
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Funding
- Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76-SFO0515]
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Layered materials consist of molecular layers stacked together by weak interlayer interactions. They often crystallize to form atomically smooth thin films, nanotubes, and platelet or fullerene-like nanoparticles due to the anisotropic bonding. Structures that predominately expose edges of the layers exhibit high surface energy and are often considered unstable. In this communication, we present a synthesis process to grow MoS2 and MoSe2 thin films with vertically aligned layers, thereby maximally exposing the edges on the film surface. Such edge-terminated films are metastable structures of MoS2 and MoSe2, which may find applications in diverse catalytic reactions. We have confirmed their catalytic activity in a hydrogen evolution reaction (HER), in which the exchange current density correlates directly with the density of the exposed edge sites.
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