Modified Titania Films for Photoelectrochemical Applications

TiO2 is recognized as a photocatalytic material and has been widely used because of its high functionality, long –term stability and non-toxicity. [1]However, because the band gap of pure TiO2 for anatase crystalline phase is as high as 3.2ev, TiO2 shows only high reactivity under ultraviolet light. In order to make the better use with ideal energy source, sunlight, people have tried several modification of TiO2, such as cation, anion doping and oxygen deficient.[2-4] Transition metal ion doping is one approach for acquiring a visible response by introducing defects into the lattice.[5-7] It is known that the photocatalytic activity of doped TiO2 is determined by the methods of doping, the amount and distribution of dopants.