期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 97, 期 -, 页码 1-5出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2018.09.015
关键词
Titanium dioxide; Nanotubes; Single-walled; Double-walled; Photoelectrochemistry
资金
- European Research Council [638857]
- Ministry of Youth, Education and Sports of the Czech Republic [LM2015082, LQ1601, CZ.02.1.01/0.0/0.0/16_013/0001829]
- Scientific Grant Agency of the Slovak Republic [1/0276/15]
In this work, the photoelectrochemical response of single-walled (SW) and double-walled (DW) TiO2 nanotube (TNT) layers is presented. TNT layers were grown on Ti substrates by anodization in two different ethylene glycol-based electrolytes to obtain similar to 5 and similar to 15 mu m thick TNT layers. The inner shell of the TNT was quantitatively removed via a mild pre-annealing followed by a selective chemical etching treatment in piranha solution. All TNT layers were investigated for their photoelectrochemical response in the ultraviolet and near visible spectral range. Significantly enhanced photocurrent densities were revealed for the SW-TNT layers. This is ascribed to improved charge carrier separation along the tube walls due to the lack of the C-and F-rich inner shell removed by etching.
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