物理化学学报 >> 2004, Vol. 20 >> Issue (08): 849-853.doi: 10.3866/PKU.WHXB20040813

研究论文 上一篇    下一篇

N, N′-对羧苄基吲哚三菁敏化纳米TiO2电极的研究

过家好;何晓英;郭敏;蔡生民;陈秀英;彭孝军   

  1. 北京大学化学与分子工程学院,北京 100871;西华师范大学化学系,四川南充 637002;大连理工大学精细化工国家重点实验室,大连 116024
  • 收稿日期:2003-12-03 修回日期:2004-04-07 发布日期:2004-08-15
  • 通讯作者: 蔡生民 E-mail:caism@pku.edu.cn

Photoelectrochemical Studies of the TiO2 Nanocrystalline Electrode Sensitized by Novel Cyanine Dye

Guo Jia-Hao;He Xiao-Ying;Guo Min;Cai Sheng-Min;Chen Xiu-Ying;Peng Xiao-Jun   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871; Department of Chemistry, China West Normal University, Sichuan Nanchong 637002;State Kay Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012
  • Received:2003-12-03 Revised:2004-04-07 Published:2004-08-15
  • Contact: Cai Sheng-Min E-mail:caism@pku.edu.cn

摘要: 应用光电化学方法研究了N, N′-对羧苄基吲哚三菁(Cy5)染料敏化TiO2纳米晶电极的光电化学行为,优化了敏化的条件.结合Cy5的循环伏安曲线和光吸收阈值,初步确定Cy5电子基态和激发态能级位置.结果表明,Cy5电子激发态能级位置能与TiO2纳米粒子导带边位置相匹配,因而使用该染料敏化可以显著提高TiO2纳米晶的光电流,使TiO2纳米晶电极吸收波长由紫外光区红移至可见光区和近红外区,光电转换效率得到明显改善,在膜厚为6.5μm、敏化时间为6 h的条件下IPCE值(incident photo-to-electricity conversion efficiency)最高可达46.4%,总的光电转换效率η为1.70%.

关键词: 染料敏化, TiO2纳米晶膜电极, 光电化学, N, N′-对羧苄基吲哚三菁

Abstract: The photoelectrochemical behaviors of the TiO2 nanocrystalline electrode sensitized by Cy5 (N-carboxylbenzyl-3,3-dimethyl-3H-indole squarylium cyanine dye)were reported. The sensitized conditions were optimized. The ground state level and the excited state level of the dye were determined by using the cyclic voltammetry and the optical absorption spectroscopy. The results show that the excited state level of this dye matches the conduction band edge of TiO2 nanoparticles. Therefore the sensitization of the dye can obviously increase the photocurrent density of TiO2 nanocrystalline electrode and results in a red-shift of optical absorption from the ultra-violet region to the visible and near infra-red region. As a result, the light-to-electricity conversion efficiency was greatly improved and the maximum value of IPCE reached 46.4% and η was 1.70% when the TiO2 nanostructured porous film was 6.5μm thick and was sensitized for 6 h.

Key words: Dye sensitization, TiO2 nanocrystalline electrode,  Photoelectrochemistry, Cyanine dye