1. Research on the effect of crystal structures on W-TiO2 nanotube array photoelectrodes by theoretical and experimental methods.
- Author
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Xin, Yanjun, Wang, Yicheng, Liu, Huiling, Ma, Dong, and Cheng, Wei
- Subjects
NANOTUBES ,NANOSTRUCTURES ,SCANNING electron microscopes ,PHOTOCATALYSIS ,XENON - Abstract
W-doped/undoped TiO2 nanotube array (TNAs) photoelectrodes with different nanostructures were successfully fabricated using the anodization method. Their morphology and characteristics were studied using scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and ultra violet/visible light diffuse reflectance spectra (UV/vis/DRS). Their electronic structure and optical properties were studied by means of first-principle. Photocatalytic (PC) performance of W-TNAs photoelectrodes with different crystal structures was evaluated using the decomposition rates of Rhodamine B (Rh.B) under xenon light illumination. The results demonstrated that W substituting Ti broadened the width of conduction band (CB) and valence band (VB) of anatase and rutile TiO2, reduced the band gap of rutile TiO2 and even caused its red-shift. W incorporated into TNAs photoelectrodes extended light absorption threshold and enhanced its utilization of solar light and PC activity, particularly, the PC performance of W-TNAs photoelectrodes with mixed crystal and rutile crystal structure. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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