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    Hydrogen Production on Ag-Pd/TiO2 Bimetallic Catalysts: Is there a Combined Effect of Surface Plasmon Resonance with Schottky Mechanism on the Photo-Catalytic Activity?

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    Type
    Article
    Authors
    Nadeem, Muhammad A.
    Al-Oufi, Maher
    Wahab, Ahmed K.
    Anjum, Dalaver H. cc
    Idriss, Hicham cc
    KAUST Department
    Electron Microscopy
    Imaging and Characterization Core Lab
    SABIC - Corporate Research and Innovation Center (CRI) at KAUST
    Date
    2017-03-28
    Online Publication Date
    2017-03-28
    Print Publication Date
    2017-03-23
    Permanent link to this record
    http://hdl.handle.net/10754/623844
    
    Metadata
    Show full item record
    Abstract
    Despite many observations that plasmonics can enhance photocatalytic reactions, their relative role in the overall reaction rate is not thoroughly investigated. Here we report that silver nanoparticles contribution in the reaction rate by its plasmonic effect is negligible when compared to that of Pd (Schottky effect). To conduct the study a series of Ag−Pd/TiO2 catalysts have been prepared, characterized and tested for H2 production from water in the presence of an organic sacrificial agent. Pd was chosen as a standard high work function metal needed for the Schottky junction to pump away electrons from the conduction band of the semiconductor and Ag (whose work function is ca. 1 eV lower than that of Pd) for its high plasmonic resonance response at the edge of the bandgap of TiO2. While H2 production rates showed linear dependency on plasmonic response of Ag in the Pd−Ag series, the system performed less than that of pure Pd. In other words, the plasmonic contribution of Ag in the Ag−Pd/TiO2 catalyst for hydrogen production, while confirmed using different excitation energies, is small. Therefore, the “possible” synergistic effect of plasmonic (in the case of Ag) and Schottky-mechanism (in the case of Pd) is minor when compared to that of Schottky-effect alone.
    Citation
    Nadeem MA, Al-Oufi M, Wahab AK, Anjum D, Idriss H (2017) Hydrogen Production on Ag-Pd/TiO2 Bimetallic Catalysts: Is there a Combined Effect of Surface Plasmon Resonance with Schottky Mechanism on the Photo-Catalytic Activity? ChemistrySelect 2: 2754–2762. Available: http://dx.doi.org/10.1002/slct.201700464.
    Publisher
    Wiley
    Journal
    ChemistrySelect
    DOI
    10.1002/slct.201700464
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1002/slct.201700464/abstract
    ae974a485f413a2113503eed53cd6c53
    10.1002/slct.201700464
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab

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