Studies on the preparation and the photoelectrochemical properties of the nanoporous titania films attached with and without photosensitizer TCPP

摘要

Fabrication of TiO₂ nanoporous films was carried out by anodic oxidation using two-step voltage mode while the subsequent attaching of the photosensitizer 5,10,15,20-tetra(4-carboxyphenyl) porphyrin (TCPP) on the prepared TiO₂ nanoporous films was carried out by the electrochemical method. Photoelectrochemical properties of TiO₂ nanoporous films attached with and without photosensitizer TCPP were analysed by fluorescence spectroscopy and electrochemical test. Effects of process parameters on the photoelectrochemical properties of TiO₂ nanoporous films were also investigated. The optimized process parameters for the preparation of TiO₂ nanoporous films with the best photoelectrochemical property can be concluded as follows: oxidation potentials is 70a€“140 V, oxidation temperature is 25?°C, H₂SO₄ electrolyte concentration is 0.5 mol la?’1 and oxidation time is 60 min. The results also show that attaching of the photosensitizer TCPP on the TiO₂ nanoporous films can indeed improve the properties of TiO₂ nanoporous films, and the optimized attaching temperature and attaching voltage are 25?°C and 60 V, respectively.