Photoelectrochemical studies on the nano-porous TiO2/polypyrrole film electrode

用光电流作用谱、光电流～电势图和UV－Vis光谱研究了TiO2／聚吡咯多孔膜电极在不含氧化还原对和含不同氧化还原体系电解质溶液中的光电转换过程．TiO2／聚吡咯多孔膜电极为双层n型半导体结构，内层TiO2多孔膜的禁带宽度为3．26eV，外层聚吡咯膜的禁带宽度为2．2eV用导电高聚物修饰半导体电极可使可见区光吸收增加，光电流增强，光电流起始波长红移至＞600nm，使定禁带半导体电极的光电转换效率得到改善．The photocurrent conversion processes of nanoporous TiO2/poly pyrrole (PPy) 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, TiO2/PPy film electrode has a duplex n-type semiconductor layer structure, The bandgap of nanoporous film is 3.26 eV, and the bandgap of PPy film is 2.2 eV. Therefore, the semiconductor electrode modified by PPy can enlarge the visible optical absorption region and increases obviously the photocurrent in visible region, The photocurrent threshold shifts to >600 nm and this effect can improve the photon-electron conversion efficiency of the semiconductor electrodes of large bandgap.SCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)1406938-9421