高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 342.

• Chemistry in Materials Sciences • 上一篇    下一篇

Preparation and photoelectrochemical characterization of nano-particulate TiO2 and polyaniline composite films on Au

HUANG Huai-Guo, LUO Jin, ZHENG Zhi-Xin, WU Ling-Ling, LIN Zhong-Hua   

  1. Department of Chemistry, State key lab for physical chemistry of solid surfaces, Xiamen University, Xiamen 361005
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 通讯作者: LIN Zhong-Hua E-mail:zhlin@xmu.edu.cn
  • 基金资助:

    The support of this work by the National Nature Science Foundation of China(29833060, 20023001) and Ministry of Education(99177) are gratefully acknowledge.

Preparation and photoelectrochemical characterization of nano-particulate TiO2 and polyaniline composite films on Au

HUANG Huai-Guo, LUO Jin, ZHENG Zhi-Xin, WU Ling-Ling, LIN Zhong-Hua   

  1. Department of Chemistry, State key lab for physical chemistry of solid surfaces, Xiamen University, Xiamen 361005
  • Online:2000-12-31 Published:2000-12-31
  • Contact: LIN Zhong-Hua E-mail:zhlin@xmu.edu.cn
  • Supported by:

    The support of this work by the National Nature Science Foundation of China(29833060, 20023001) and Ministry of Education(99177) are gratefully acknowledge.

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摘要：

TiO2 and polyaniline(PANI) composite film was obtained by electrochemical methods[1] and investigated for solar energy conversion application. A strong rectifying effect was found in the cyclic voltammogram of the film in dark when the scan speed was slow enough (5 mV/s) and a quasi-reversible voltammogram of the film was observed when the scan speed was fast (100 mV/s). The results of both the cyclic voltammograms and the SEM images of the composite film show that the PANI film is almost completely covered with nano-particulate TiO2. Two anodic photocurrent bands and a cathodic band was observed in the spectra of the photocurrent of the TiO2/PANI/PATP(p-aminothiophenol)/Au film in 0.05 mol/L Fe(CN)63-/Fe(CN)64- solution. The band at 300~400 nm (3.1~4.1 eV) can be ascribed to the photocurrent band of TiO2 particles and the bands at 450~730 nm (1.7~2.8 eV) can be ascribed to those of the PANI. The partially-oxidized PANI has internal photoemission function and the insulating matrix of PANI is verified to be reduced PANI with a 3.33 eV bandgap energy. The flat-band potentials of partially-oxidized PANI and TiO2/PANI composite film in 1.0 mol/LHClO4 solution are determined as 0.87 V and 0.09(SHE) from Mott-Schottky plots, respectively.

Abstract:

TiO2 and polyaniline(PANI) composite film was obtained by electrochemical methods[1] and investigated for solar energy conversion application. A strong rectifying effect was found in the cyclic voltammogram of the film in dark when the scan speed was slow enough (5 mV/s) and a quasi-reversible voltammogram of the film was observed when the scan speed was fast (100 mV/s). The results of both the cyclic voltammograms and the SEM images of the composite film show that the PANI film is almost completely covered with nano-particulate TiO2. Two anodic photocurrent bands and a cathodic band was observed in the spectra of the photocurrent of the TiO2/PANI/PATP(p-aminothiophenol)/Au film in 0.05 mol/L Fe(CN)63-/Fe(CN)64- solution. The band at 300~400 nm (3.1~4.1 eV) can be ascribed to the photocurrent band of TiO2 particles and the bands at 450~730 nm (1.7~2.8 eV) can be ascribed to those of the PANI. The partially-oxidized PANI has internal photoemission function and the insulating matrix of PANI is verified to be reduced PANI with a 3.33 eV bandgap energy. The flat-band potentials of partially-oxidized PANI and TiO2/PANI composite film in 1.0 mol/LHClO4 solution are determined as 0.87 V and 0.09(SHE) from Mott-Schottky plots, respectively.

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