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Drastic Layer‐Number‐Dependent Activity Enhancement in Photocatalytic H2 Evolution over n MoS2/CdS (n ≥ 1) Under Visible Light
Abstract
Exploiting noble‐metal‐free cocatalysts is of huge interest for photocatalytic water splitting using solar energy. As an efficient cocatalyst in photocatalysis, MoS 2 is shown promise as a low‐cost alternative to Pt for hydrogen evolution. Here we report a systematical study on controlled synthesis of MoS 2 with layer number ranging from ≈1 to 112 and their activities for photocatalytic H 2 evolution over commercial CdS. A drastic increase in photocatalytic H 2 evolution is observed with decreasing MoS 2 layer number. Particularly for the single‐layer (SL) MoS 2, the SL‐MoS 2/CdS sample reaches a high H 2 generation rate of ≈2.01 × 10−3m h−1 in Na 2 S–Na 2 SO 3 solutions and ≈2.59 × 10−3m h−1 in lactic acid solutions, corresponding to an apparent quantum efficiency of 30.2% and 38.4% at 420 nm, respectively. In addition to the more exposed edges and unsaturated active S atoms, valence band–XPS and Mott–Schottky plots analysis indicate that the SL MoS 2 has the more negative conduction band energy level than the H+/H 2 potential, facilitating the hydrogen reduction.
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“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 [39]
In the citing paper
“Take MoS 2 as an example, when its layer number decreases from bulk to monolayer, the bandgap of MoS 2 increases from 0.9 eV to 1.6 eV due to the quantumconfi nement effect.”
From 2D Transition‐Metal‐Dichalcogenide‐Nanosheet‐Based Composites for Photocatalytic and Electrocatalytic Hydrogen Evolution Reactions (2016) · cites this paper as [39]
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Metadata
- Authors
- Chang, K., Li, M., Wang, T., Ouyang, S., Li, P., Liu, L., & Ye, J.
- Affiliations
- National Institute for Materials Science (JP)
- Tianjin University (CN)
- Corresponding author
- Ye, Jinhua
- Venue
- Advanced Energy Materials
- Publisher
- Wiley
- Published
- 2015-03-12
- Volume
- 5
- Issue
- 10
- ISSN
- 1614-6832 (ISSN-L)
- 1614-6840
- OpenAlex
- W2026392595
- Cited by
- 276
- References
- 55
- Citations by year
- 2026: 3 · 2025: 12 · 2024: 19 · 2023: 21 · 2022: 24 · 2021: 20 · 2020: 37 · 2019: 35 · 2018: 34 · 2017: 37 · 2016: 26 · 2015: 8
- FWCI
- 10.36
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Advanced Energy Materials (publishedVersion)
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Keywords
- photocatalytic hydrogen evolution, MoS2, CdS, layer number dependence, monolayer MoS2, visible light photocatalysis, noble-metal-free cocatalyst, photocatalytic water splitting, conduction band energy level, apparent quantum efficiency
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