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    Spontaneous Formation of Noble- and Heavy-Metal-Free Alloyed Semiconductor Quantum Rods for Efficient Photocatalysis

    69795.pdf (2.290Mb)
    Access Status
    Open access
    Authors
    Chen, D.
    Zhang, H.
    Li, Y.
    Pang, Y.
    Yin, Z.
    Sun, Hongqi
    Zhang, L.
    Wang, Shaobin
    Saunders, M.
    Barker, E.
    Jia, Guohua
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Chen, D. and Zhang, H. and Li, Y. and Pang, Y. and Yin, Z. and Sun, H. and Zhang, L. et al. 2018. Spontaneous Formation of Noble- and Heavy-Metal-Free Alloyed Semiconductor Quantum Rods for Efficient Photocatalysis. Advanced Materials. 30 (39): 1803351.
    Source Title
    Advanced Materials
    DOI
    10.1002/adma.201803351
    ISSN
    1521-4095
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE160100589
    URI
    http://hdl.handle.net/20.500.11937/69583
    Collection
    • Curtin Research Publications
    Abstract

    Quasi-1D cadmium chalcogenide quantum rods (QRs) are benchmark semiconductor materials that are combined with noble metals to constitute QR heterostructures for efficient photocatalysis. However, the high toxicity of cadmium and cost of noble metals are the main obstacles to their widespread use. Herein, a facile colloidal synthetic approach is reported that leads to the spontaneous formation of cadmium-free alloyed ZnSx Se1-x QRs from polydisperse ZnSe nanowires by alkylthiol etching. The obtained non-noble-metal ZnSx Se1-x QRs can not only be directly adopted as efficient photocatalysts for water oxidation, showing a striking oxygen evolution capability of 3000 µmol g-1 h-1 , but also be utilized to prepare QR-sensitized TiO2 photoanodes which present enhanced photo-electrochemical (PEC) activity. Density functional theory (DFT) simulations reveal that alloyed ZnSx Se1-x QRs have highly active Zn sites on the (100) surface and reduced energy barrier for oxygen evolution, which in turn, are beneficial to their outstanding photocatalytic and PEC activities.

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