Enhanced Electrocatalytic Properties of Transition-Metal Dichalcogenides Sheets by Spontaneous Gold Nanoparticle Decoration

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Here, we report that transition-metal dichalcogenides such as MoS2 and WS2 can be decorated with gold nanoparticles by a spontaneous redox reaction with hexachloroauric acid in water. The resulting gold nanoparticles tend to grow at defective sites, and therefore, selective decorations at the edges and the line defects in the basal planes of bulk single crystals were observed. The lithium intercalation-exfoliation process makes the basal planes of chemically exfoliated MoS2 and WS2 sheets much more defective than their single-crystalline counterparts, leading to a more uniform and higher-density deposition of gold nanoparticles. Due to the greatly improved charge transport between adjacent sheets, the resulting MoS2/Au and WS2/Au hybrids show significantly enhanced electrocatalytic performance toward hydrogen evolution reactions.
Publisher
AMER CHEMICAL SOC
Issue Date
2013-04
Language
English
Article Type
Article
Keywords

SINGLE-LAYER MOS2; HYDROGEN EVOLUTION; VISIBLE-LIGHT; GRAPHENE; NANOCOMPOSITES; NANOSTRUCTURES; IDENTIFICATION; SEMICONDUCTOR; PHOTOCATALYST; INTERCALATION

Citation

JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.4, no.8, pp.1227 - 1232

ISSN
1948-7185
DOI
10.1021/jz400507t
URI
http://hdl.handle.net/10203/174804
Appears in Collection
MS-Journal Papers(저널논문)
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