A nanocomposite of carbon quantum dots and TiO2nanotube arrays: enhancing photoelectrochemical and photocatalytic properties

A novel nanocomposite of carbon quantum dots and TiO2 nanotubes was fabricated and its enhanced photocatalytic and photoelectrochemical properties were demonstrated

Mingxuan Sun; Xiaoqing Ma; Xi Chen; Yujun Sun; Xiaoli Cui; Yuehe Lin

2013

Scholarcy highlights

  • A novel nanocomposite of carbon quantum dots and TiO2 nanotubes was fabricated and its enhanced photocatalytic and photoelectrochemical properties were demonstrated
  • CQDs were assembled on the surface of vertically aligned TiO2 nanotube arrays and the as-prepared samples were characterized by field-emission scanning electron microscopy, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, photoelectrochemical and photocatalytic measurements
  • A red shift of light absorption edge and more absorption in the visible light region were observed for the resulting samples from the UV-vis diffuse reflectance spectra
  • An enhanced photocurrent and photopotential were demonstrated for the CQDs sensitized TiO2 nanotubes under visible light irradiation and the photocurrent density was 2.7 times larger than that of pristine TiO2 nanotubes
  • The photocatalytic activity of CQDs/TiO2 nanotubes towards the degradation of methylene blue was demonstrated and about 14% enhanced degradation efficiency was obtained with the presence of CQDs
  • This work developed a simple method to fabricate CQDs and demonstrated the introduction of CQDs to be a new approach for improving the utilization of visible light for TiO2 nanotube arrays

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