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?

Handle URI:
http://hdl.handle.net/10754/623844
Title:
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?
Authors:
Nadeem, Muhammad A.; Al-Oufi, Maher; Wahab, Ahmed K.; Anjum, Dalaver H.; Idriss, Hicham
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.
KAUST Department:
SABIC - Corporate Research and Innovation Center (CRI) at KAUST; Imaging and Characterization Core Lab
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-Blackwell
Journal:
ChemistrySelect
Issue Date:
28-Mar-2017
DOI:
10.1002/slct.201700464
Type:
Article
ISSN:
2365-6549
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/slct.201700464/abstract
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorNadeem, Muhammad A.en
dc.contributor.authorAl-Oufi, Maheren
dc.contributor.authorWahab, Ahmed K.en
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorIdriss, Hichamen
dc.date.accessioned2017-05-31T11:23:09Z-
dc.date.available2017-05-31T11:23:09Z-
dc.date.issued2017-03-28en
dc.identifier.citationNadeem 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.en
dc.identifier.issn2365-6549en
dc.identifier.doi10.1002/slct.201700464en
dc.identifier.urihttp://hdl.handle.net/10754/623844-
dc.description.abstractDespite 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.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/slct.201700464/abstracten
dc.titleHydrogen Production on Ag-Pd/TiO2 Bimetallic Catalysts: Is there a Combined Effect of Surface Plasmon Resonance with Schottky Mechanism on the Photo-Catalytic Activity?en
dc.typeArticleen
dc.contributor.departmentSABIC - Corporate Research and Innovation Center (CRI) at KAUSTen
dc.contributor.departmentImaging and Characterization Core Laben
dc.identifier.journalChemistrySelecten
dc.contributor.institutionDepartment of Chemistry; University College London; London UK.en
kaust.authorNadeem, Muhammad A.en
kaust.authorAl-Oufi, Maheren
kaust.authorWahab, Ahmed K.en
kaust.authorAnjum, Dalaver H.en
kaust.authorIdriss, Hichamen
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