Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (08): 1778-1784.doi: 10.3866/PKU.WHXB201305302

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Highly Active and Stable Catalyst for Visible Light Hydrogen Production Based on Oxidative Quenching of Eosin Y

LI Bo1,2, LÜ Gong Xuan1   

  1. 1 Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Tianshui Zhong Road 18, Lanzhou 730000, P. R. China;
    2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2013-04-16 Revised:2013-05-29 Published:2013-07-09
  • Contact: Lü Gong Xuan E-mail:gxlu@lzb.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21173242), National Key Basic Research Program of China (973) (2009CB22003), and National High Technology Research and Development Program of China (863) (2012AA051501).

Abstract:

The effects and mechanism of methyl viologen (MV2+) on photocatalytic hydrogen production over an active, stable catalyst sensitized by Eosin Y (EY) under visible light were studied by UV-Vis absorption, fluorescence spectroscopies and photoelectric experiments. The results showed that MV2+ increased the efficiency of electron transfer from excited states of EY to the surface of Pt/TiO2 and suppressed accumulation of unstable intermediate EY3-· by an oxidative and reductive quenching mechanism. MV2+ also improved the activity and stability of photocatalytic hydrogen production by an EY-sensitized Pt/TiO2 system with triethanolamine (TEOA) as an electron donor. The effects of transient photocurrent and concentration of EY on the hydrogen production activity of dye-sensitized systems with and without MV2+ provided further evidence that MV2+ acted as an electron transfer agent to effectively improve photoinduced electron transfer and utilization efficiency.

Key words: Methyl violet, Activity, Stability, Hydrogen production, Photocatalysis

MSC2000: 

  • O643