Research on the effect of crystal structures on W-TiO{sub 2} nanotube array photoelectrodes by theoretical and experimental methods
- College of Resource and Environment, Qingdao Agricultural University, Changcheng Road 700, Chengyang District, Qingdao 266109 (China)
- State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Department of Environmental Science and Engineering Harbin Institute of Technology, Huanghe Road 73, Nangang District, Harbin 150090 (China)
- Library, Qingdao Agricultural University, Changcheng Road 700, Chengyang District, Qingdao 266109 (China)
W-doped/undoped TiO{sub 2} 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 TiO{sub 2}, reduced the band gap of rutile TiO{sub 2} 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.
- OSTI ID:
- 22218103
- Journal Information:
- Journal of Applied Physics, Vol. 114, Issue 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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