Stable TiO2 nanotube arrays with high UV photoconversion efficiency |
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Authors: | F Mura A Masci A Pozio |
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Affiliation: | a Department of Chemistry Material Environment Engineering, via del Castro Laurenziano 7, 00161, Rome, Italy b ENEA, C.R. Casaccia, Via Anguillarese 301, 00123, S. Maria di Galeria, Rome, Italy |
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Abstract: | This work is intended to define an optimal methodology for preparing highly ordered TiO2 nanotube arrays by a 60-V anodization in a glycol ethylene solution. In order to obtain a mechanically stable structure with a high UV photoconversion efficiency, it is necessary to carefully control the growth mechanism through the anodization process. For this reason, the nanotube arrays have to be formed upon a compact titanium dioxide layer with well-defined thickness. Besides, both the fluoride concentration and anodization time are strictly correlated, because elevated concentrations and/or a long anodization time produce unstable structure with low photoconversion efficiency. The best result in the terms of reproducibility has been obtained previously for a three-minute galvanostatic oxide growth on the pickled titanium sheet, and anodic growth in ethylene glycol solution containing 1 wt.% H2O and 0.20 wt.% NH4F for a period lower than 4.5 h. The UV photoconversion efficiency was measured and a maximum value of 28.3% has been obtained, which is the highest result in the literature. |
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Keywords: | Nanotube TiO2 Water photo-electrolysis Photoelectrode OER |
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