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

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

Результат исследований: Научные публикации в периодических изданияхстатья

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 оригиналаанглийский
ЖурналCatalysts
Том9
Номер выпуска12
СостояниеОпубликовано - 27 ноя 2019

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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

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