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Making Metal[BOND]Carbon Nitride Heterojunctions for Improved Photocatalytic Hydrogen Evolution with Visible Light

Authors

  • Yan Di Dr.,

    1. Department of Colloid Chemistry, Max-Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam (Germany), Fax: (+49) 331-567-9502
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  • Xinchen Wang Dr.,

    1. Department of Colloid Chemistry, Max-Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam (Germany), Fax: (+49) 331-567-9502
    2. Research Institute of Photocatalysis, State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002 (P. R. China)
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  • Arne Thomas Prof. Dr.,

    1. Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
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  • Markus Antonietti Prof. Dr.

    1. Department of Colloid Chemistry, Max-Planck Institute of Colloids and Interfaces, Research Campus Golm, 14424 Potsdam (Germany), Fax: (+49) 331-567-9502
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Abstract

Gold nanoparticles were deposited on the surface of a g-C3N4 semiconductor by deposition–precipitation, photodeposition, and impregnation methods to make metal–semiconductor junctions for photocatalytic hydrogen evolution from aqueous solution containing an electron donor with visible light illumination. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV/Vis, and transmission electron microscopy (TEM). Results show that the Au/g-C3N4 prepared by the deposition–precipitation method possessed the best photocatalytic activity, due to the formation of tight Au–semiconductor heterojunctions effectively promoting the transfer of charge from light-excited g-C3N4. Surface modification of the Au/g-C3N4 with a second metal further improved the activity of the photocatalytic system, which was explained by simultaneous optimization of electron transfer by the gold and chemical reactivity by the secondary metal.

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