Self-Organized TiO2 Nanotube Arrays: Synthesis by Anodization in an Ionic Liquid and Assessment of Photocatalytic Properties

Wender, Heberton; Feil, Adriano F.; Diaz, Leonardo B.; Ribeiro, Camila S.; Machado, Guilherme J.; Migowski, Pedro; Weibel, Daniel E.; Dupont, Jairton and Teixeira, Sérgio R. (2011). Self-Organized TiO2 Nanotube Arrays: Synthesis by Anodization in an Ionic Liquid and Assessment of Photocatalytic Properties. ACS Applied Materials & Interfaces, 3(4) pp. 1359–1365.

DOI: https://doi.org/10.1021/am200156d

Abstract

Self-organized TiO2 nanotube (NT) arrays were produced by anodization in ethylene glycol (EG) electrolytes containing 1-n-butyl-3-methyl-imidazolium tetrafluoroborate (BMI.BF4) ionic liquid and water. The morphology of the as-formed NTs was considerably affected by changing the anodization time, voltage, and water and ionic liquid electrolyte concentrations. In general, a nanoporous layer was formed on the top surface of the TiO2 NTs, except for anodization at 100 V with 1 vol % of BMI.BF4, where the NT’s mouth was revealed. The length and bottom diameter of the NTs as well as the pore diameter of the top layer showed a linear relationship with increased anodization voltage. These TiO2 NTs were tested as photocatalysts for methyl orange photodegradation and hydrogen evolution from water/methanol solutions by UV light irradiation. The results show that the TiO2 NTs obtained by anodization in EG/H2O/BMI.BF4 electrolytes are active and efficient for both applications.

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