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The TiO 2 nanoring/nanotube (R/T) combined structure was obtained by a simple two-step anodization. The as-prepared samples were characterized by X-ray diffraction, Raman, scanning electron microscopy, photoluminescence spectra, and UV–vis absorption spectroscopy. The photoelectrochemical measurements demonstrate that the combined structure shows high photo-to-current conversion efficiency, fast charge transfer speed, and surface dominant photoelectrochemical response. The behavior of photoelctrochemical activity in TiO 2 R/T combined structure and pure nanotubes (NTs) has been investigated through electrochemical impedance spectroscopy and photo-to-current conversion efficiency measurement. It is demonstrated that the formation of a heterojuction structure in R/T composite plays an important role in the kinetic behaviors (including charge separation efficiency and transport capability) of photogenerated charges. The TiO 2 R/T combined structure greatly increases charge separation efficiency and photoconversion capability. We discuss the mechanism for the enhancement of TiO 2 R/T combined structure photoelectrochemical activity and support our conclusions with ultraviolet photoelectron spectroscopy results.
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Wang et al. (2011) studied this question.
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