北京航空航天大学学报 ›› 2015, Vol. 41 ›› Issue (7): 1322-1329.doi: 10.13700/j.bh.1001-5965.2014.0541

• 论文 • 上一篇    下一篇

量子点与TiO2电极参数对光阳极电子寿命及性能影响

权琳琳, 李卫平, 耿慧芳, 刘慧丛, 朱立群   

  1. 北京航空航天大学 材料科学与工程学院, 北京 100191
  • 收稿日期:2014-09-04 修回日期:2014-09-26 出版日期:2015-07-20 发布日期:2015-07-30
  • 通讯作者: 刘慧丛(1974—),女,河北无极人,副教授,liuhc@buaa.edu.cn,主要研究方向为功能材料的腐蚀与防护. E-mail:liuhc@buaa.edu.cn
  • 作者简介:权琳琳(1987—),男,河南洛阳人,硕士研究生,quanlinlin163@163.com
  • 基金资助:
    中央高校基本科研业务费专项资金; 国家自然科学基金(51371020)

Influence of quantum dots and TiO2 photoanode parameters on electron lifetimes and performance of photonode

QUAN Linlin, LI Weiping, GENG Huifang, LIU Huicong, ZHU Liqun   

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2014-09-04 Revised:2014-09-26 Online:2015-07-20 Published:2015-07-30

摘要: 通过对P25TiO2光阳极薄膜厚度、敏化的量子点种类及量子点敏化方法研究,探讨了使用连续离子层吸附反应法的敏化方法(SILAR)时,P25TiO2薄膜厚度与光阳极电子寿命的关系,以及量子点种类、共敏化工艺对光阳极光电性能的影响.采用电化学阻抗(EIS)、开路电压衰减(OCVD)及紫外-可见吸收方法,对影响光阳极光电性能的TiO2薄膜厚度、量子点种类及共敏化工艺因素进行测试分析.实验结果表明:当光阳极薄膜厚度为12μm时,电子复合几率最小,光阳极的电子寿命相对最长;采用连续离子层吸附反应法(SILAR)对多种量子点共敏化的光阳极(TiO2/CdS/CdSe/ZnS)与单一量子点敏化的光阳极(TiO2/CdS)相比,短路电流提高了34%,光转换效率提高了42%;合适的共敏化工艺也有助于提高光阳极的电子寿命、光谱吸收范围和吸收强度.

关键词: 光阳极, 光电性能, 电子寿命, 共敏化, 电子复合

Abstract: Effects of film thickness of P25TiO2 photoanode, different types of quantum dots sensitized and method of quantum dots co-sensitization, which are the factors of interest, on P25TiO2 photoanode were analyzed. The relationship between P25TiO2 film thickness and electron lifetimes were investigated by the method of successive ionic layer absorption and reaction (SILAR). Besides, the influence of quantum dots type and method of quantum dots co-sensitization on photoelectrochemical performance of photoanode was studied. Electrochemical impedance spectra (EIS), open circuit voltage decay (OCVD) and UV-Vis absorption spectra were used to measure and analyze the factors which influence the photoelectrochemical performance and electron lifetimes of P25TiO2 photoanode. The results indicate that P25TiO2 with the film thickness of 12μm exhibits the minimum recombination losses and longer electron lifetimes. Furthermore, the short circuit current and power conversion efficiency of co-sensitized photoanode (TiO2/CdS/CdSe/ZnS) increase 34% and 42% respectively compared to those of single sensitized photoanode (TiO2/CdS). Besides, appropriate film thickness of P25TiO2 photoanode and method of co-sensitization are important factors to increase the electron lifetimes of photoanode, the absorption spectrum and intensity of photoanode.

Key words: photoanode, photoelectrochemical performance, electron lifetimes, cosensitization, electron recombination

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