关键词：电池材料；光催化剂；纳米材料
摘 要：Titanium dioxide (TiO_2) is the most intensely investigated photocatalyst and until today the only one that has already been commercialized and that is involved in many applications such as self-cleaning materials, dye-sensitized solar cells, as well as water and air purification. Consequently, an exponential growth of research activities concerning the nanoscience and nanotechnology of TiO_2 has been observed during the last decades. These raising research activities have recently lead to the synthesis of nanosized TiO_2 nanoparticles and nanostructures with different shapes, morphologies and phase compositions. Thus, the present chapter focuses mainly on the synthesis of these nanomaterials. The thermodynamic stability, the transition between different TiO_2 polymorphs and the surface properties of these polymorphs are presented with the aim to utilize this information for a better understanding of the mechanism of the formation of TiO_2 nanomaterials. The photocatalytic applications of these TiO_2 nanomaterials are also discussed.