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  • A comparative study between photocatalytic and photoelectrocatalytic properties of Pt deposited TiO2 thin films for glucose degradation

    Author(s)
    Gan, Wee Y
    Friedmann, Donia
    Amal, Rose
    Zhang, Shanqing
    Chiang, Ken
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Year published
    2010
    Metadata
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    Abstract
    This study compares the photocatalytic (PC) and photoelectrocatalytic (PEC) oxidation of glucose by Pt-TiO2 films under similar conditions. The overall oxidation efficiency of the PEC process was better than the PC process, for both TiO2 and Pt-TiO2 films. The Pt deposits enhanced the PEC oxidation efficiency of glucose at low cathodic (-0.1 V) and low anodic potential bias (+0.1 V). As the applied anodic bias was increased to >+0.5 V, the undoped-TiO2 films outperformed their Pt-TiO2 counterparts. This suggests that in the studied systems, at an anodic bias of >+0.5 V, more holes were available for the oxidation of glucose ...
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    This study compares the photocatalytic (PC) and photoelectrocatalytic (PEC) oxidation of glucose by Pt-TiO2 films under similar conditions. The overall oxidation efficiency of the PEC process was better than the PC process, for both TiO2 and Pt-TiO2 films. The Pt deposits enhanced the PEC oxidation efficiency of glucose at low cathodic (-0.1 V) and low anodic potential bias (+0.1 V). As the applied anodic bias was increased to >+0.5 V, the undoped-TiO2 films outperformed their Pt-TiO2 counterparts. This suggests that in the studied systems, at an anodic bias of >+0.5 V, more holes were available for the oxidation of glucose on the surface of TiO2 compared to Pt-TiO2 films. In the PEC systems, above a certain applied bias, Pt deposits may have a detrimental effect on the performance of a PEC system because the Pt deposits could merely block the surface of TiO2 (particularly at the highest Pt loadings). Lower measured photocurrents from Pt-TiO2 films compared to undoped-TiO2 and a decrease in the photocurrent as the Pt loading increased corroborate this postulation.
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    Journal Title
    Chemical Engineering Journal
    Volume
    158
    Issue
    3
    DOI
    https://doi.org/10.1016/j.cej.2010.01.030
    Subject
    Chemical engineering
    Chemical engineering not elsewhere classified
    Civil engineering
    Environmental engineering
    Materials engineering
    Publication URI
    http://hdl.handle.net/10072/36899
    Collection
    • Journal articles

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