4.6 Article

Improving conversion efficiency of CdS quantum dots-sensitized TiO2 nanotube arrays by doping with Zn2+ and decorating with ZnO nanoparticles

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 146, Issue 3, Pages 531-537

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2014.04.011

Keywords

Thin films; Nanostructures; Optical properties; Electrochemical properties; Surfaces

Funding

  1. Henan University
  2. Natural Science Foundation of Henan University [2013YBZR046]

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The Zn-doped TiO2 nanotube arrays (TNTs) decorated with ZnO nanoparticles have been prepared via electrochemical anodization and immersing method. Furthermore, the CdS quantum dots (QDs) were deposited on the prepared Zn-doped TNTs-ZnO thin films by chemical bath deposition (CBD) method to fabricate the CdS QDs-sensitized Zn-doped TNTs-ZnO photoelectrodes. The nanostructure, morphology, optical properties and electrochemical properties of the CdS/Zn-doped TNTs-ZnO photoelectrode with comparison to those of the CdS/TNTs photoelectrodes were investigated. It has been found that the Zn-doped TNTs-ZnO photoelectrodes significantly increased the UV-vis light absorption of the CdS/Zn-doped TNTs-ZnO photoelectrodes and reduced the charge recombination at the surfaces of the CdS/Zn-doped TNTs-ZnO photoelectrodes. As a consequence, when the Zn-doped TNTs-ZnO film was adopted instead of the plain TNTs film, the light-chemical energy conversion efficiency of the CdS/Zn-doped TNTs-ZnO photoelectrode was much improved compared with the CdS/TNTs photoelectrode. A maximum energy conversion efficiency achieved for the CdS/Zn-doped TNTs-ZnO photoelectrode is 3.86%, which is a 17% improvement compared with the maximum energy conversion efficiency of 3.29% achieved for the CdS/TNTs photoelectrodes. (C) 2014 Elsevier B.V. All rights reserved.

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