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Citation: Guo Jia-Hao, He Xiao-Ying, Guo Min, Cai Sheng-Min, Chen Xiu-Ying, Peng Xiao-Jun. Photoelectrochemical Studies of the TiO₂ Nanocrystalline Electrode Sensitized by Novel Cyanine Dye[J]. Acta Physico-Chimica Sinica, ;2004, 20(08): 849-853. doi: 10.3866/PKU.WHXB20040813 shu

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

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 Date: 3 December 2003
Available Online: 15 August 2004

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.
- Dye sensitization;TiO₂ nanocrystalline electrode;　Photoelectrochemistry;Cyanine dye
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Photoelectrochemical Studies of the TiO₂ Nanocrystalline Electrode Sensitized by Novel Cyanine Dye