MoS2/Graphene Cocatalyst for Efficient Photocatalytic H2 Evolution under Visible Light Irradiation
Abstract
Exploiting noble-metal-free cocatalysts is of huge interest for photocatalytic water splitting using solar energy. Here we report a composite material consisting of CdS nanocrystals grown on the suface of a nanosized MoS2/graphene hybrid as a high-performance noble-metal-free photocatalyst for H2 evolution under visible light irradiation. Through the optimizing of each component proportion, the MoS2/G-CdS composite showed the highest photocatalytic H2 production activity when the content of the MoS2/graphene cocatalyst is 2.0 wt % and the molar ratio of MoS2 to graphene is 1:2. The photocatalytic H2 evolution activity of the proposed MoS2/G-CdS composite was tested and compared in Na2S–Na2SO3 solution and lactic acid solution. A 1.8 mmol/h H2 evolution rate in lactic acid solution corresponding to an AQE of 28.1% at 420 nm is not only higher than the case in Na2S–Na2SO3 solution of 1.2 mmol/h but also much higher than that of Pt/CdS in lactic acid solution. The relative mechanism has been investigated. It is believed that this kind of MoS2/G-CdS composite would have great potential as a promising photocatalyst with high efficiency and low cost for photocatalytic H2 evolution reaction.
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Active S atoms on exposed edges of TMDs can strongly bond with H+ ions in solution, enabling effective reduction of H+ ions to H2.
“Moreover, the active S atoms on the exposed edges of TMDs could strongly bond with the H + ions in solution, enabling the effective reduction of H + ions to H 2 . [ 24,39,40 ]”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
The MoS2/G-CdS composite showed the highest photocatalytic hydrogen evolution activity when the content of MoS2/G co-catalyst was 2.0 wt% and the molar ratio of MoS2 to G was 1:2.
“The MoS 2 /G-CdS composite showed the highest photocatalytic hydrogen evolution activity when the content of MoS 2 /G co-catalyst was 2.0 wt% and the molar ratio of MoS 2 to G was 1:2.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
The hydrogen evolution rate of the optimized MoS2/G-CdS composite is much higher than that using pure CdS catalyst (ca. 100 μmol h-1 g-1).
“is much higher than that using pure CdS catalyst (ca. 100 µmol h -1 g -1 ).”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
TMDs as co-catalysts can improve photocatalytic activity because active S atoms on exposed edges of 2D MoS2 can strongly bond with H+ in solution, enabling H+ reduction to H2.
“Numerous reports have demonstrated that TMDs as co-catalysts can improve the photocatalytic activity for two main reasons: i) the active S atoms on the exposed edges of 2D MoS 2 can strongly bond with H + in solution, enabling the H + reduction to H 2 . [ 20,24,40,50,111,112 ] In this way, the photocatalytic activity for HER can be greatly enhanced.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
TMD nanosheets have lower cost compared to noble metals.
“Due to the lower cost of TMD nanosheets compared to noble metals, great efforts have been devoted to the preparation of TMD-based composites to improve the photocatalytic hydrogen evolution activity. [ 37,40,46 ]”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
Incorporation of graphene into MoS2/CdS enhances electron transfer and retards recombination of electron-hole pairs, thus improving photocatalytic hydrogen evolution activity.
“the incorporation of graphene could enhance electron transfer and retard the recombination of electron-hole pairs, thus improving the photocatalytic hydrogen evolution activity.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [40]
RGO plays an important role as it assists in the charge separation and efficient electron transport to the reaction sites, owing to its excellent electrical properties.
“In addition, RGO also plays an important role as it assists in the charge separation and efficient electron transport to the reaction sites, owing to its excellent electrical properties.”
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- Authors
- Chang, K., Mei, Z., Wang, T., Kang, Q., Ouyang, S., & Ye, J.
- Affiliations
- Research Center for Materials Nanoarchitectonics (JP)
- Tianjin University (CN)
- Corresponding author
- Ye, Jinhua
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-06-13
- Volume
- 8
- Issue
- 7
- Pages
- 7078-7087
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2024250911
- Cited by
- 953
- References
- 4
- Citations by year
- 2026: 10 · 2025: 41 · 2024: 28 · 2023: 49 · 2022: 67 · 2021: 75 · 2020: 101 · 2019: 114 · 2018: 131 · 2017: 145 · 2016: 111 · 2015: 63 · 2014: 18
- FWCI
- 37.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Nano (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Keywords
- photocatalytic hydrogen evolution, MoS2/graphene composite, CdS nanocrystals, noble-metal-free cocatalyst, visible light photocatalysis, photocatalytic water splitting, lactic acid solution, reaction mechanism
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