Fabrication and Photoelectrochemical Properties of CuO/TiO2 Heterojunction Nanotubes Array Film

In order to improve the visible light response in titania photocatalysts, CuO/TiO₂ heterojunction nanostructures (CuO-TNT) were proposed and fabricated via the electrochemical process. TiO₂ nanotubes array (TNT) was first fabricated by secondary anodization, after that the CuO was doped by the electrodeposition. The thin film was characterized by X-ray diffraction (XRD), diffuse reflection spectra (DRS) and field emission scanning electron microscopy (FESEM). Besides, its photoelectrochemical properties were measured in 0.1 M Na2SO₃ solution. By comparing the results under different conditions of deposition, it was found that the deposition current density was a crucial parameter for controlling the morphology and the photoelectrochemical properties of the samples.