Journal
ELECTROCHIMICA ACTA
Volume 196, Issue -, Pages 24-32Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.02.160
Keywords
TiO2 nanotubes; hydrodynamic conditions; water splitting; electrochemical impedance spectroscopy (EIS); Mott-Schottky analysis
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Funding
- Ministerio de Economia y Competitividad [CTQ2013-42494-R]
- Laser Raman Microscope acquisition [UPOVO8-3E-012]
- European Social Fund
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This work studies the influence of using hydrodynamic conditions (Reynolds number, Re = 0 to Re = 600) during Ti anodization and Li+ intercalation on anatase TiO2 nanotubes. The synthesized photocatalysts were characterized by using Field Emission Scanning Electron Microscope (FE-SEM), Raman Confocal Laser Microscopy, Electrochemical Impedance Spectroscopy (EIS), Mott-Schottky analysis (M-S), photoelectrochemical hydrogen production and resistance to photocorrosion tests. The obtained results showed that the conductivity of the NTs increases with Li+ intercalation and Re. The latter is due to the fact that the hydrodynamic conditions eliminate part of the initiation layer formed over the tube-tops, which is related to an increase of the photocurrent in the photoelectrochemical water splitting. Besides, the photogenerated electron-hole pairs are facilitated by Li+ intercalation. Finally, this work confirms that there is a synergistic effect between Re and Li+ intercalation. (C) 2016 Elsevier Ltd. All rights reserved.
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