Photoelectrochemical Studies on the Nano-Porous TiO2/Polypyrrole Film Electrode

Abstract

Abstract: 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.

Key words: Photoelectrochemistry, Nano-porous TiO₂/PPy film electrode, Conducting polymer

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LIU Min-Sheng, YANG Mai-Zhi, HAO Yan-Zhong, YU Chen, CAI Sheng-Min, LI Yong-Fang. Photoelectrochemical Studies on the Nano-Porous TiO₂/Polypyrrole Film Electrode[J]. Chem. J. Chinese Universities, 1997, 18(6): 938.

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Photoelectrochemical Studies on the Nano-Porous TiO₂/Polypyrrole Film Electrode

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