Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (11): 2101-2106.doi: 10.3866/PKU.WHXB201408281

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Photocatalytic Overall Water Splitting on Perovskite H1.9K0.3La0.5Bi0.1Ta2O7 with Pt/WO3 under the Z Scheme System

CHEN Wei1,2, WANG Hui1, CHEN Xiao-Ping2, MAO Li-Qun1, SHANGGUAN Wen-Feng2   

  1. 1. Institute of Fine Chemistry and Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, Henan Province, P. R. China;
    2. Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
  • Received:2014-05-29 Revised:2014-08-26 Published:2014-10-30
  • Contact: SHANGGUAN Wen-Feng
  • Supported by:

    The project was supported by the National High Technology Research and Development Program of China (863) (2012AA051501), National Natural Science Foundation of China (51072116), and International Cooperation Project of Shanghai Municipal Science and Technology Commission, China (12160705700).


Photocatalytic overall water splitting under a two-step photocatalytic (Z scheme) system was studied with layered perovskite H1.9K0.3La0.5Bi0.1Ta2O7 (HKLBT) and Pt/WO3 used as the hydrogen and oxygen evolution photocatalysts, respectively. The influence of the redox mediator species and the concentration of the redox mediator was investigated. The results showed that overall water splitting (H2/O2 volume ratio: 2:1) was achieved using Fe2+/Fe3+ as the redox mediator, where the hydrogen and oxygen evolution rates reached 66.8 and 31.8 μmol·h-1 (H2/O2 volume ratio: 2.1:1), respectively. A very high concentration of the redox mediator is unable to improve the photocatalytic activity because it is blocked by the carrier mediator redox rate based on the activity of the photocatalysts.

Key words: Photocatalysis, Overall water splitting, Z scheme system, Layered perovskite oxide