The Sensitization of Nanoporous TiO{sub}2 Electrodes by Porphyrin Derivatives with Different Substituents

摘要

Nanoporous TiO{sub}2 electrodes were sensitized by different porphyrin derivatives, tera-hydroxyphenyl porphyrin (THPP) and tera-carboxylphenyl porphyrin (TCPP). Both kinds of sensitized electrodes were characterized by UV-vis, XRD and XPS. The results showed that the interaction between TiO{sub}2 and TCPP was stronger than that between TiO{sub}2 and THPP. Both kinds of the sensitized electrodes were assembled to photoelectrochemical cells. The photocurrent responses of the photoelectrochemical cell under different incident illumination directions were different significantly. The overall light-to-electric energy conversion yield (η) of TCPP-sensitized cell was 0.11%, while the conversion efficiency of THPP-sensitized cell was 0.06%.