摘要
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 pho-tocurrent action spectra, the potential dependence of photocurrent and UV-Vis absorption spectra. lt is concluded that nanoporous, TiO2/PPy film electrode has a duplex n-type semi-conductor layer structure. The bandgap of nanoporous film is 3. 26 eV, and the bandgap of PPy film is 2. 2 eV. There fore, the semiconductor electrode modified by PPy can enlarge the visible optical absorption region and increases obviously the photocurrent in vislble region. The photocurrent threshold shifts to>600nm and this effect can improve the photon-elec-tron conversion efficiency of the semiconductor electrodes of large bandgap.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第6期938-942,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
江西省自然科学基金
中国科学院化学研究所有机固体开放实验室基金
关键词
太阳能电池
二氧化钛
多孔膜
聚吡咯电极
Photoelectrochemistry, Nano-porous TiO_2/PPy film electrode, Conducting polymer
