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    Synthesis of nitrogen and sulfur co-doped reduced graphene oxide as efficient metal-free cocatalyst for the photo-activity enhancement of CdS

    Access Status
    Fulltext not available
    Authors
    Han, W.
    Chen, L.
    Song, W.
    Wang, Shaobin
    Fan, X.
    Li, Y.
    Zhang, F.
    Zhang, G.
    Peng, W.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Han, W. and Chen, L. and Song, W. and Wang, S. and Fan, X. and Li, Y. and Zhang, F. et al. 2018. Synthesis of nitrogen and sulfur co-doped reduced graphene oxide as efficient metal-free cocatalyst for the photo-activity enhancement of CdS. Applied Catalysis B: Environmental. 236: pp. 212-221.
    Source Title
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2018.05.021
    ISSN
    0926-3373
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/68878
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. Nitrogen and sulfur co-doped reduced graphene oxide (NS-rGO) was synthesized using a facile low temperature calcination method, which was then used as support and cocatalyst for the anchor of CdS. The obtained CdS/NS-rGO nanocomposites exhibit ultra-high photocatalytic activity for hydrogen evolution and 4-nitrophenol (4-NP) reduction under visible light (? = 420 nm). Their activity could also be adjusted by changing the doping amount of S and N, or by changing the ratios between CdS and NS-rGO. The optimum percentage of NS-rGO is 5 wt%, at which CdS/NS-rGO photocatalyst could achieve the highest H2evolution rate of 1701 µmol h–1g–1. Moreover, the reduction from 4-NP to 4-aminophenol (4-AP) could be completed within only 6 min over this optimized composite. NS-rGO here could provide more active sites as well as tune the band gap structure to increase the photo-activity. The density functional theory (DFT) calculations reveal that NS-rGO has a small Gibbs free energy for H* adsorption (?GH), which could increase the utilization efficency of photo-generated electrons for H2generation. NS-rGO is therefore an idea alternate cocatalyst of noble metals for new photocatalysts development.

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