物理化学学报 >> 2014, Vol. 30 >> Issue (11): 2101-2106.doi: 10.3866/PKU.WHXB201408281

催化和表面科学 上一篇    下一篇

钙钛矿氧化物H1.9K0.3La0.5Bi0.1Ta2O7和Pt/WO3组成的Z体系下完全光解水性能

陈威1,2, 王慧1, 陈小平2, 毛立群1, 上官文峰2   

  1. 1. 河南大学化学化工学院精细化学与工程研究所, 河南 开封 475004;
    2. 上海交通大学燃烧与环境技术中心, 上海 200240
  • 收稿日期:2014-05-29 修回日期:2014-08-26 发布日期:2014-10-30
  • 通讯作者: 上官文峰 E-mail:Shangguan@sjtu.edu.cn
  • 基金资助:

    国家高技术研究发展计划项目(863) (2012AA051501), 国家自然科学基金(51072116)及上海市科技创新行动计划国际合作项目(12160705700)资助

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 E-mail:Shangguan@sjtu.edu.cn
  • 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).

摘要:

以质子化层状钙钛矿氧化物H1.9K0.3La0.5Bi0.1Ta2O7 (HKLBT)作为产氢催化剂, Pt/WO3作为产氧催化材料进行Z 型体系下完全分解水反应. 考察了不同载流子传递介质及不同载流子浓度对反应活性的影响. 结果表明, 以Fe2+/Fe3+为载流子传递介质时可以实现水的完全分解(H2/O2体积比为2:1), 8 mmol·L-1的FeCl3作为初始载流子传递介质时, 产氢、产氧活性分别为66.8和31.8 μmol·h-1, 氢氧体积比为2.1:1. 受光催化材料对载流子传递介质氧化还原速度的限制, 过高的载流子传递介质浓度并不能提高光催化活性.

关键词: 光催化, 完全分解水, Z型体系, 层状钙钛矿氧化物

Abstract:

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

MSC2000: 

  • O643