Li Wan a, Jian-feng Li a, Jia-you Feng a, Wei Sun b, Zong-qiang Mao b. Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation[J]. Chinese Journal of Chemical Physics , 2008, 21(5): 487-492. doi: 10.1088/1674-0068/21/05/487-492
Citation: Li Wan a, Jian-feng Li a, Jia-you Feng a, Wei Sun b, Zong-qiang Mao b. Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation[J]. Chinese Journal of Chemical Physics , 2008, 21(5): 487-492. doi: 10.1088/1674-0068/21/05/487-492

Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation

doi: 10.1088/1674-0068/21/05/487-492
Funds:  This work was supported by the National High Technology Research and Development Program of China(No.2007CB36600).
  • Received Date: 2008-05-06
  • A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.
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Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation

doi: 10.1088/1674-0068/21/05/487-492
Funds:  This work was supported by the National High Technology Research and Development Program of China(No.2007CB36600).

Abstract: A series of Cr doped TiO2 films were prepared by micro arc oxidation (MAO) using an electrolyte of Na3PO4+K2Cr2O7. X-ray diffraction and scanning electron microscopy revealed that the films mainly consisted of anatase phase with a porous surface morphology. The films have an excellent photocatalytic effect for degradation of methylene blue and decomposition of water under visible light illumination. This arises from the formation of Cr3+/Cr4+ and oxygen vacancy energy levels owing to Cr doping. The former reduces the electron-hole recombination chance, while the latter generates a new gap between the conduction band (CB) and valence band (VB) of TiO2, which lowers the photo energy of the excited electron in the VB to the oxygen vacancy states. The mechanisms for film synthesis during the MAO process are also presented.

Li Wan a, Jian-feng Li a, Jia-you Feng a, Wei Sun b, Zong-qiang Mao b. Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation[J]. Chinese Journal of Chemical Physics , 2008, 21(5): 487-492. doi: 10.1088/1674-0068/21/05/487-492
Citation: Li Wan a, Jian-feng Li a, Jia-you Feng a, Wei Sun b, Zong-qiang Mao b. Photocatalysts of Cr Doped TiO2 Film Prepared by Micro Arc Oxidation[J]. Chinese Journal of Chemical Physics , 2008, 21(5): 487-492. doi: 10.1088/1674-0068/21/05/487-492

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