Journal
JOURNAL OF POWER SOURCES
Volume 286, Issue -, Pages 224-231Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.174
Keywords
TiO2 nanostructures; Anodization; Hydrodynamic conditions; Water splitting; Electrochemical Impedance Spectroscopy; Mott-Schottky analysis
Funding
- Generalitat Valenciana [PROMETEOII/2014/009]
- Fundacion Iberdrola
- Universitat Politecnica de Valencia
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This work studies the electrochemical and photoelectrochemical properties of a new type of TiO2 nanostructure (nanosponge) obtained by means of anodization in a glycerol/water/NH4F electrolyte under controlled hydrodynamic conditions. For this purpose different techniques such as Scanning Electronic Microscopy (SEM), Raman Spectroscopy, Electrochemical Impedance Spectroscopy (EIS) measurements, Mott-Schottky (M-S) analysis and photoelectrochemical water splitting tests under standard AM 1.5 conditions are carried out. The obtained results show that electron-hole separation is facilitated in the TiO2 nanosponge if compared with highly ordered TiO2 nanotube arrays. As a result, nanosponges enhance the photoelectrochemical activity for water splitting. (C) 2015 Elsevier B.V. All rights reserved.
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