Photoelectrochemical Behavior Of Zn(Ⅱ) And La(Ⅲ) Co-Doped TiO₂ Nanostucted Film Electrode

La(â…¢) has been codoped with Zn(â…¡) on TiO₂ nanoporous film electrodes in order that the photopeak efficiency of TiO₂ nanoporous film electrodes could be improved. All the work was showed as below:First, TiO₂ nanostructured porous electrodes were prepared from tetrabutyl titanate through the sol-gel method by dip-coating technique and the ions were doped in the collosol.Second, every TiO₂ nanostructured porous electrodes were investigated by ultraviolet-visible absorption spectrometry and cylic AC voltammetry. The result shows that the absorbance efficiency of TiO₂ nanostructured porous electrode doped with La(â…¢) and Zn(â…¡) is the highest and the number and the ability of electron-hole pairs on TiO₂ nanostructured porous electrode doped with La(â…¢) and Zn(â…¡) are better than the number and the ability on pure TiO₂ nanostructured porous electrode and TiO₂ nanostructured porous electrode doped with only Zn(â…¡).Third, every TiO₂ nanostructured porous electrodes were investigated with photoelectrochemical techniques. The result shows: the photocurrent of TiO₂ nanostructured porous electrode doped with La(â…¢) (0.5%) and Zn( â…¡ )(0.5%) is stronger than the photocurrent of TiO₂ nanostructured porous electrode doped with only Zn( â…¡ ).And the mechanism is discussed here.Finally, TiO₂ nanostucted porous film electrodes doped with La(â…¢)(0.5%) and Zn( â…¡ )(0.5%) were modified by Conducting polymers (polypyrrole and polyaniline) as sensitizers. The nano-porous film electrodes modified by conducting polymers (polypyrrole and polyaniline) can enlarge the visible optical absorption and increase obviously the photocurrent in visible region. And the mechanism is discussed here.