Enhanced Electrocatalytic Properties of Transition-Metal Dichalcogenides Sheets by Spontaneous Gold Nanoparticle Decoration
Abstract
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.
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The onset overpotential of the monolayer MoS2 film on porous Au was only 118 mV, which is lower than the reported value of many MoS2 nanostructures with high-density edge sites and lattice defects.
“Interestingly, the onset overpotential of the MoS 2 fi lm was only 118 mV, which is lower than the reported value of many MoS 2 nanostructures with high-density edge sites and lattice defects (Figure 7 f). [ 155,156 ]”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [155]
A small loading of Au nanoparticles (3.3 mol%) could result in ca. 25% improvement in the electron transport in WS2-Au hybrid.
“a small loading of Au nanoparticles (3.3 mol%) could result in ca. 25% improvement in the electron transport.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [155]
The optimized WS2-Au sample with 21.1 mol% Au exhibited the best electrocatalytic activity toward the HER with 230 mV overpotential and Tafel slope of 57 mV per decade.
“The optimized sample with 21.1 mol% Au exhibited the best electrocatalytic activity toward the HER with 230 mV overpotential and Tafel slope of 57 mV per decade .”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [155]
When the Au ratio in the WS2-Au hybrid increases to over 30 mol%, a decreased HER efficiency was observed due to the blocking of active sites in WS2.
“When the Au ratio in the WS 2 -Au hybrid increases to over 30 mol%, a decreased HER effi ciency was observed due to the blocking of active sites in WS 2 .”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [155]
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Enhanced catalytic activity in strained chemically exfoliated WS2 nanosheets for hydrogen evolution
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- Authors
- Kim, J., Byun, S., Smith, A. J., Yu, J., & Huang, J.
- Affiliations
- Northwestern University (US)
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
- Corresponding author
- Huang, Jiaxing
- Venue
- The Journal of Physical Chemistry Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-03-27
- Volume
- 4
- Issue
- 8
- Pages
- 1227-1232
- ISSN
- 1948-7185 (ISSN-L)
- OpenAlex
- W2080272020
- Cited by
- 345
- References
- 3
- Citations by year
- 2026: 5 · 2025: 9 · 2024: 13 · 2023: 18 · 2022: 19 · 2021: 25 · 2020: 33 · 2019: 35 · 2018: 41 · 2017: 39 · 2016: 29 · 2015: 40 · 2014: 31 · 2013: 8
- FWCI
- 13.09
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Physical Chemistry Letters (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
- Keywords
- transition metal dichalcogenides, MoS2, tungsten disulfide, gold nanoparticles, redox reactions, hydrogen evolution reaction, electrocatalysis
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