Self-organized TiO₂ nanotube layers have attracted considerable scientific and technological interest over the past 15 years motivated for their wide range of applications including (photo-) catalysis, hydrogen generation and biomedical uses [1,2]. The synthesis of the 1D TiO₂ nanotube layers is carried out by a conventional electrochemical anodization of valve Ti metal sheets in various electrolytes.

By now, the synthesis of TiO₂ nanotube layers with different nanotube dimensions (diameter, length) and the application of these nanotube layers is well established on the laboratory scale. However, for real applications outside the laboratory scale, such as photocatalysis [3], TiO₂ nanotube layers of much larger size are necessary. To date, just a few efforts were carried out to scale up the size of the nanotube layers to more than a few cm² [3-7] due to the difficulty of controlling the parameters of the anodization process on a larger scale. The main challenge is the huge current received during the anodization of large substrates. This, in turn, leads to an increase in the electrolyte temperature that may result in dielectric breakdown of the growing nanotube layers.

In this presentation, the preparation of TiO₂ nanotube layers on larger area titanium substrates (dozens of cm²) will be discussed, taking into account the control of the anodization parameters. The TiO₂ nanotube layers with different thicknesses and nanotube diameters were employed for gas phase photocatalysis, following the ISO standards [3,8]. Experimental details and photocatalytic results will be presented and discussed.

References

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[2] K. Lee, A. Mazare, P. Schmuki, Chem. Rev., 114 (2014) 9385.

[3] H. Sopha, M. Baudys, M. Krbal, R. Zazpe, J. Prikryl, J. Krysa, J.M. Macak, Electrochem. Commun., 97 (2018) 91.

[4] S. Franz, D. Perego, O. Marchese, M. Bestetti, J. Water Chem. Tech., 37 (2015) 108.

[5] H.-I. Kim, D. Kim, W. Kim, Y.-C. Ha, S.-J. Sim, S. Kim, W. Choi, Appl. Catal. A: Gen., 521 (2016) 174.

[6] J.P. Ghosh, G. Achari, C.H. Langford, Water Environ. Res., 88 (2016) 785.

[7] C. Xiang, L. Sun, Y. Wang, G. Wang, X. Zhao, S. Zhang, J. Phys. Chem. C 121 (2017) 15448.

[8] H.Sopha, M. Baudys, J. Krýsa, J. M. Macak, Applied Mater. Today, submitted.