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    Black NiO-TiO2 nanorods for solar photocatalysis: Recognition of electronic structure and reaction mechanism

    Access Status
    Fulltext not available
    Authors
    Liu, J.
    Li, Y.
    Ke, J.
    Wang, Shaobin
    Wang, L.
    Xiao, H.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Liu, J. and Li, Y. and Ke, J. and Wang, S. and Wang, L. and Xiao, H. 2018. Black NiO-TiO2 nanorods for solar photocatalysis: Recognition of electronic structure and reaction mechanism. Applied Catalysis B: Environmental. 224: pp. 705-714.
    Source Title
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2017.11.028
    ISSN
    0926-3373
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/59309
    Collection
    • Curtin Research Publications
    Abstract

    This work provides an engineering guide to construct active sites on TiO 2 nanorods (NRs) by coupling p-type black NiO nanoclusters (E g = 1.42 eV) with rich crystal defects and match-up band structure for excellent solar photocatalysis. Photo-oxidation of toluene was used as a model reaction to evaluate the photocatalytic performance of black NiO/TiO 2 hybrids under simulated solar light irradiation from a 300 W Xe-lamp. The black NiO/TiO 2 hybrids Exhibit 80% of photodegradation conversion and 56% of mineralization efficiency, which are 7.9 and 4.5 times higher than those of TiO 2 NRs. Detailed characterizations reveal that highly dispersed NiO and p-n heterojunction effectively facilitate light-harvesting, separation and transfer of photo-generated charge carries, and significantly inhibit the recombination of electrons and holes. Furthermore, the realignment of band structure and the p-n heterojunctions in NiO/TiO 2 result in the production of [rad]O 2 - and h + with a longer lifetime, which could efficiently attack the aromatic ring of toluene. The efficient adsorption of toluene by H-bonding formation also facilitates the photo-oxidation of toluene on NiO/TiO 2 .

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