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

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• 作者：Jaemyung Kim ; Segi Byun ; Alexander J. Smith ; Jin Yu ; Jiaxing Huang
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2013
• 出版时间：April 18, 2013
• 年：2013
• 卷：4
• 期：8
• 页码：1227-1232
• 全文大小：325K
• 年卷期：v.4,no.8(April 18, 2013)
• ISSN：1948-7185

文摘

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鈥揺xfoliation 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.

Keywords:

2D nanomaterials; defects; functionalization; nanoparticles; water splitting