Preparation Of Titania Materials And Their Applications In The Solar Energy Field

Nowadays, with the increasing energy crisis and the serious environmental pollution, TiO2has raised considerable concern with its non-toxic, non-secondary pollution, low-cost, and excellent performance in the field of solar cells and photocatalytic degradation of organic. In the various applications, T1O2is often used as nanocrystalline materials, so the properties were often affected by the morphology of material. Thus, TiO2with special morphology, larger surface area and specific crystal plane is now a trend in the preparation of TiO2.This thesis mainly focuses on the following aspects:1. TiO2particles and TiO2spheres were prepared by hydrothermal method.The structures and morphologies of the samples were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy. The results show that the particles are anatase phase with size of15nm, while the latter one is anatase/rutile mixed crystal phase with the diameter of500nm.2.Carbon based materials were researched as the counter electrode. It is found that with the increase of annealing temperature, the conductive property of the carbon materials was improved;the filling factor and optical conversion efficiency were improved significantly when C/Pt composite was used as the counter electrode.3. Anatase phase TiO2nanorods were successfully prepared using solvothermal technology, its short-axis and long-axis length were～5nm and20nm, respectively, and the nanorods growed along the (001)planes;while, when mineralizer CTAB was added, its short-axis and long-axis length were changed into～10nm and40nm, respectively, the nanorods growed along the (004) plane.4. Add40nm TiO2nanorods into15nm TiO2particles to make mixed catalyst. When the ratio is9:1(15nm TiO2particles:40nm of TiO2nano-rods=9:1),the best catalytic effect is obtained, and catalytic efficiency is even higher than the P25...