Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (11): 2731-2736.doi: 10.3866/PKU.WHXB201608232

• ARTICLE • Previous Articles     Next Articles

Preparation and Performance of a SILAR TiO2/CdS/Co-Pi Water Oxidation Photoanode

Li ZHOU*(),Huan-Huan LIU,Yu-Lin YANG,Liang-Sheng QIANG   

  • Received:2016-05-31 Published:2016-11-08
  • Contact: Li ZHOU E-mail:lizhou@hit.edu.cn
  • Supported by:
    the Heilongjiang Postdoctoral Fund, China(LBH-Z14106);Program for Innovation Research of Science in Harbin Institute of Technology, China(HIT Q201508)

Abstract:

Asemiconductor heterostructure of TiO2/CdS/cobalt phosphate water oxidation catalyst (Co-Pi WOC) photoanode was fabricated by the successive ionic layer adsorption and reaction (SILAR) procedure and photoassisted electro-deposition. The structure, morphologys and magnetic properties of the resultant particles were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS). CdS and Co-Pi quantum dots loaded on to the TiO2 nanofilm. The TiO2/CdS/Co-Pi photoanode had an initial photocurrent of 1.3 mA·cm-2 and a stable level of 0.5 mA·cm-2. A relatively stable level was maintained under visible light irradiation in neutral solution, especially at the low bias voltage of 0 V (vs Ag/AgCl). In this system, CdS quantum dots serve as the light absorber and generate electron holes; the Co-Pi WOC acts as a hole transfer layer that can transfer the hole for water oxidation; and the TiO2 is the electron conductor for efficient charge transfer to the cathode to actualize proton reduction.

Key words: Photocatalysis, Water oxidation, Successive ionic layer adsorption and reaction, Visible light, TiO2/CdS/Co-Pi photoanode

MSC2000: 

  • O644