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  • Stable isolated metal atoms as active sites for photocatalytic hydrogen evolution

    Author(s)
    Xing, Jun
    Chen, Jian Fu
    Li, Yu Hang
    Yuan, Wen Tao
    Zhou, Ying
    Zheng, Li Rong
    Wang, Hai Feng
    Hu, P
    Wang, Yun
    Zhao, Hui Jun
    Wang, Yong
    Yang, Hua Gui
    Griffith University Author(s)
    Zhao, Huijun
    Wang, Yun
    Year published
    2014
    Metadata
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    Abstract
    The process of using solar energy to split water to produce hydrogen assisted by an inorganic semiconductor is crucial for solving our energy crisis and environmental problems in the future. However, most semiconductor photocatalysts would not exhibit excellent photocatalytic activity without loading suitable co-catalysts. Generally, the noble metals have been widely applied as co-catalysts, but always agglomerate during the loading process or photocatalytic reaction. Therefore, the utilization efficiency of the noble co-catalysts is still very low on a per metal atom basis if no obvious size effect exists, because heterogeneous ...
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    The process of using solar energy to split water to produce hydrogen assisted by an inorganic semiconductor is crucial for solving our energy crisis and environmental problems in the future. However, most semiconductor photocatalysts would not exhibit excellent photocatalytic activity without loading suitable co-catalysts. Generally, the noble metals have been widely applied as co-catalysts, but always agglomerate during the loading process or photocatalytic reaction. Therefore, the utilization efficiency of the noble co-catalysts is still very low on a per metal atom basis if no obvious size effect exists, because heterogeneous catalytic reactions occur on the surface active atoms. Here, for the first time, we have synthesized isolated metal atoms (Pt, Pd, Rh, or Ru) stably by anchoring on TiO2, a model photocatalystic system, by a facile one-step method. The isolated metal atom based photocatalysts show excellent stability for H2 evolution and can lead to a 6-13-fold increase in photocatalytic activity over the metal clusters loaded on TiO2 by the traditional method. Furthermore, the configurations of isolated atoms as well as the originality of their unusual stability were analyzed by a collaborative work from both experiments and theoretical calculations.
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    Journal Title
    Chemistry: A European Journal
    Volume
    20
    Issue
    8
    DOI
    https://doi.org/10.1002/chem.201303366
    Subject
    Chemical sciences
    Inorganic chemistry not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/67751
    Collection
    • Journal articles

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