4.6 Article

Bi2Se3, Bi2Te3 quantum dots-sensitized rutile TiO2 nanorod arrays for enhanced solar photoelectrocatalysis in azo dye degradation

期刊

JOURNAL OF PHYSICS-ENERGY
卷 3, 期 1, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/2515-7655/abc52c

关键词

semiconductor photoelectrocatalysis; hydrothermal process; rutile TiO2; V2VI3 chalcogenide quantum dots; dye degradation; topographic insulator

资金

  1. National Natural Science Foundation of China [51772094]
  2. Natural Science Foundation of Beijing Municipality [L182040]

向作者/读者索取更多资源

By adjusting the concentration of the Ti precursor and reaction time during hydrothermal process, the density and diameter of rutile TiO2 nanorod arrays vertically aligned on conductive fluorine-doped tin oxide glass can be optimized for photocatalysis. Quantum dots of V2VI3 (V = Bi; VI = Se, Te) are then used as sensitizers to enhance the visible-light response of TiO2, leading to increased photocurrent, improved light harvesting properties, and enhanced charge carrier separation capability.
Rutile TiO2 nanorod arrays vertically aligned on conductive fluorine-doped tin oxide glass are optimized for photocatalysis in terms of the density and diameter of nanorods by tuning the concentration of Ti precursor and reaction time during the hydrothermal process. Quantum dots (QDs) of V2VI3( V = Bi; VI = Se, Te) topographic insulators are then employed as sensitizers to enhance the visible-light response of TiO2. Electrochemical measurements show that the decoration of Bi2Se3 or Bi2Te3 significantly increases the photocurrent due to the enhanced light harvesting properties and the charge carrier separation capability mediated by the topographic isolation effect of V2VI3 QDs. Photoelectrocatalytic (PEC) activity evaluation is conducted towards the decoloration of azo dyes, including methyl orange and methylene blue under the sunlight irradiation. The elaborated Bi2Se3/TiO2 nanorod array exhibits the superior PEC performances, presenting shows great potentials in environmental remediation.

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