TY - JOUR

T1 - Photoelectrochemical Behavior of the Ternary Heterostructured Systems CdS/WO3/TiO2

AU - Murashkina, Anna A.

AU - Bakiev, Tair V.

AU - Artemev, Yurii M.

AU - Rudakova, Aida V.

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef W.

N1 - Funding information: This research was funded by Russian Foundation for Basic Research (RFBR) via a research Grant 18– 29–23035 mk and the Saint-Petersburg State University via a Research Grant (Pure ID 32706707).

PY - 2019/12

Y1 - 2019/12

N2 - 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.

AB - 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.

KW - Cadmium sulfide

KW - Heterojunctions

KW - Heterostructures

KW - Nanotubes

KW - Planar structures

KW - Titanium dioxide

KW - Tungsten trioxide

KW - Z-scheme

UR - http://www.scopus.com/inward/record.url?scp=85075922676&partnerID=8YFLogxK

U2 - 10.3390/catal9120999

DO - 10.3390/catal9120999

M3 - Article

VL - 9

JO - CATALYSTS

JF - CATALYSTS

SN - 2073-4344

IS - 12

M1 - 999

ER -