Аннотация
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.
Язык оригинала | английский |
---|---|
Журнал | Catalysts |
Том | 9 |
Номер выпуска | 12 |
Состояние | Опубликовано - 27 ноя 2019 |
Предметные области Scopus
- Электрохимия
- Возобновляемые источники энергии и окружающая среда
- Материаловедение (все)
Ключевые слова
- heterojunctions
- heterostructures
- Z-scheme
- planar structures
- nanotubes
- titanium dioxide
- cadmium sulfide
- tungsten trioxide