The photoelectrochemical performance of TiO2 nanoparticles has caused great attention because of their tremendous potential applications in the solar utilization and environment protection.Among various TiO2 morphologies,the TiO2nanotube arrays were drawn ever-increasing attention because they not only possess high surface areas but also offer the advantage of directed carrier transport facilitating the collection of photogenerated charge carriers and therefore are expected to be promising high-performance photoanodes for use in solar fuel production.Nevertheless, the intrinsic band gap of TiO2 limits its absorption in the ultraviolet part of the solar spectrum.In this article titania nanotube arrays (TiO2 NTs) were successfully prepared by a simple two-step electrochemical anodization method.In addition, the doping and sensitization of TiO2 NTs were performed to improve the photosensitivity in the visible light region and depress the recombination of photogenerated electron-hole pairs.The structures and properties of samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), UV-visible spectroscopy (UV), X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM) and photoelectrochemical test (PEC).A series of important conclusions and innovative results with significance are obtained.