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    Photoelectrochemical Behavior of the Ternary Heterostructured Systems CdS/WO3/TiO2

    Year: 2019

    Journal: Catalysts, Volume 9, DEC

    Authors: Murashkina, Anna A.; Bakiev, Tair, V; Artemev, Yurii M.; Rudakova, Aida, V; Emeline, Alexei, V; Bahnemann, Detlef W.

    Organizations: Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [18-29-23035 mk]; Saint-Petersburg State University [32706707]

    Keywords: heterojunctions; heterostructures; Z-scheme; planar structures; nanotubes; titanium dioxide; cadmium sulfide; tungsten trioxide

    In this article, we report the results of comparative studies of photoelectrochemical behavior of the binary CdS/TiO2 and WO3/TiO2 and ternary CdS/WO3/TiO2 heterostructures based on titania nanotube and planar structures. Physical-chemical characterization by XRD, XPS, and electron microscopy methods together with electrochemical impedance spectroscopy measurements confirm a successful formation of heterostructured electrodes, both nanotube-based and planar. The results of photoelectrochemical studies of the heterostructures demonstrate a significant difference in their behavior depending on the structure geometry and the character of the formed heterojunctions. It is concluded that nanotube-based heterostructure electrodes can be characterized by a stochastic set of different heterojunctions while planar systems demonstrate well-ordered heterojunctions with a strictly defined electron transfer direction. Particularly, we demonstrate the possibility of the realization of Z-scheme of photoexcitation and charge separation in ternary planar systems under visible light irradiation.
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