Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (08): 849-853.doi: 10.3866/PKU.WHXB20040813

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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

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