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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (3): 377-382. 上一篇    下一篇

研究论文

导电高聚物修饰纳米尺度TiO~2多孔膜电极的光电化学研究

柳闽生;杨迈之;郝彦忠;蔡生民;李永舫   

  1. 江西九江师范专科学校化学系.九江(332000);北京大学化学系.北京(100871)
  • 发布日期:2001-03-15

Photoelectrochemical studies on nanoporous TiO~2/conduction polymer film electrode

Liu Minsheng;Yang Maizhi;Hao Yanzhong;Cai Shengmin;Li Yongfang   

  1. Jiangxi Jiujiang Teachers Coll, Dept Chem.Jiujiang(332000);Beijing Univ., Dept. of Chem.Beijing(100871);Inst of Chem, CAS.Beijing(100080)
  • Published:2001-03-15

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用光电化学方法研究了用导电高聚物修饰的纳米晶TiO~2多孔膜电极在不含氧化还原对和含不同氧化还原对体系电解质溶液中的光电转换过程。TiO~2/导电高聚物多孔膜电极为双层n型半导体结构，内层TiO~2多孔膜的禁带宽度为3.26eV，外层聚吡咯(PPy)膜的禁带宽度为2.23eV，而聚苯胺(PAn)膜的禁带宽度为2.88eV。用导电高聚物修饰半导体电极能使其在可见光区的光吸收增加，光电流增强，且起始波长红移至>600nm，使宽禁带半导体电极的光电转换效率得到明显改善。

关键词: 导电高聚物, 二氧化钛, 膜电极, 太阳能电池, 光电变换, 光电化学

The photocurrent conversion of nanoporous TiO~2/conducting polymer film electrode were studied in the electrolytes with or without redox couple by using the photocurrent action spectra, the potential dependence of photocurrent and UV-vis absorption spectra. It is concluded that nanoporous TiO~2/conducting polymer film electrode has a duplex n-type semiconductor layer structure. The bandgap of nanoporous film and the bandgap of poly pyrrole (PPy) film, and poly aniline (PAn) film is 3.26, 2.23 and 2.88 eV, respectively. Therefore, the semiconductor electrode modified by PPy or PAn can enlarge the visible optical absorption region and obviously increase the photocurrent in visivle region. The photocurrent threshould shifts to >600 nm. This effect may improve the photoelectron conversion efficiency of the semiconductor electrodes of large bandgap.

Key words: CONDUCTING POLYMER, TITANIUM DIOXIDE, MEMBRANE ELECTRODES, SOLAR CELLS, PHOTOELECTRICAL CONVERSION, PHOTO ELECTROCHEMISTRY

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