Preparation Of One-dimensional Titanium Dioxide Sol And Photoelectrochemical Performance

Titanium dioxide sol has very important applications in the photocatalytic film, dye-sensitized solar cells, photoelectro-chemical sensors, and so on. There are two problems in the current sol preparation methods:first, the solvent of sol is mainly organic solvents (such as ethanol); second, the sol particles is the amorphous titanium dioxide. This paper is a presentation of how to obtain the water-based anatase TiO2 sol by the peptization, and a preliminary study of the sol obtained in the dye-sensitized solar cells and photoelectro-chemical properties of chemical oxygen demand (COD) in the photoelectrocatalysis determination aqueous solution. The main results obtained are follows:We describe a peptization and hydrothermal process for the synthesis of nanorod-like anatase TiO2 nanocrystals with a high aspect ratio without any organic surfactants. Inorganic titanium salt as the main raw material to prepare the precipitation, after a low-temperature peptization to make the transparent anatase titanium dioxide sol. hydrothermal treatment for the sol, adjust its crystallinity and morphology, to form a nanorods of 6 nm diameter, aspect ratio is more than 5. Concentrate the sol to make the photoanode prepared for dye-sensitized solar cells. It has got more efficient photoelectric conversion performance (5-6%).Developed a pH value of the neutral, porous electrode modifier without corrosive or organic to replace the TiCl4 solution has an important application value. In this paper, the transparent anatase sol is prepared by self-made water-soluble peroxotitanium acid as percursor, through hydrothermal method at low temperature. Use P25 titanium dioxide slurry as the preparation of the main percursor, with the screen printing method to prepare the porous TiO2 electrodes on the FTO glass. The sol of low concentration infiltrates into porous titanium dioxide electrodes to improve the internal connectivity of the electrode and surface structure. Modified electrode is assembled into dye-sensitized solar cell, the photoelectric conversion is improved from 2.8% to 4.7%.The barrier layer is prepared by dip-coating method between the FTO and the porous titanium dioxide layer. The results show that the sol film did not change transmittance of the glass, did no effect on dye's light absorption, effectively prevented direct contact between the electrolyte and the conductive glass, the final photoelectric conversion performance of the electrode was improved from the original 3.8% to 4.9%.Using screen printing and dip-coating method in the FTO preparated Two kinds of the porous and sol- porous TiO2 film; using glucose as the target pollutants, Photoelectrochemical properties was investigated by the electrochemical workstation. The results show that the introduction of the sol has increased the adhesion between TiO2 nanoparticles and substrate; improved the TiO2 particles and the base ohmic contact; made the charge transfer resistance of the sol-porous electrodes is much less than that of the porous electrodes; improved the photoelectrocatalysis Electrode's photocurrent.