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    Electron Transfer of the Metal/Semiconductor System in Photocatalysis

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    Type
    Article
    Authors
    Khan, M. A.
    Maity, Partha
    Al-Oufi, M.
    Al-Howaish, I.K.
    Idriss, H.
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Research
    SABIC - Corporate Research and Innovation Center (CRI) at KAUST
    Date
    2018-07-10
    Online Publication Date
    2018-07-10
    Print Publication Date
    2018-07-26
    Permanent link to this record
    http://hdl.handle.net/10754/631643
    
    Metadata
    Show full item record
    Abstract
    Probing into the relationship between charge carrier dynamics and photocatalytic reactions is central to the understanding and therefore the design of photocatalysts. We have studied the charge carrier lifetime of Pt/CN and compared it to that of CN alone using femtosecond pump-probe transient absorption spectroscopy in the 500-900 nm signal range. Parallel photocatalytic reactions were also conducted to link the extracted lifetime to the corresponding rates of hydrogen production from water. The presence of Pt (with a mean particle size of ca. 2.5 nm) on CN decreased the lifetime of excited electrons in the conduction band (CB). This has occurred in pure water as well as in the presence of the organic sacrificial agent used. These results suggest that Pt particles on this n-type semiconductor act as electron trap centers (either by pumping away CB electrons or by creating trap centers at the interface). The corresponding increase in reaction rates can be linked to this electron transfer.
    Citation
    Khan MA, Maity P, Al-Oufi M, Al-Howaish IK, Idriss H (2018) Electron Transfer of the Metal/Semiconductor System in Photocatalysis. The Journal of Physical Chemistry C 122: 16779–16787. Available: http://dx.doi.org/10.1021/acs.jpcc.8b03741.
    Sponsors
    The authors thank Shahid Bashir (SABIC-KAUST) for conducting the BET surface area measurements and Lutfan Sinatra (KAUST) for further TEM images.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.8b03741
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpcc.8b03741
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.8b03741
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; KAUST Solar Center (KSC)

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