Abstract
In the past decade, anodically formed self-organized TiO2 nanotube layers attracted considerable scientific interest (see e.g. reviews [1,2]). This is mainly due to the fact that these layers combine the defined nanotubular geometry with a broad range of functional features inherent to TiO2. Particularly in photoelectrochemical water splitting nanotubular layers have shown remarkable results. The presentation will first give an overview of the most promising features of classic nanotube layers for photocatalysis and then focus on TiO2 nanotube (NT) arrays, converted by a high pressure H2 treatment to anatase-like "black titania"[3,4]. This modification shows a remarkable high open-circuit photocatalytic hydrogen production rate without the presence of any cocatalyst. Other attempts to form black titania, namely using classic reduction treatments (e.g., atmospheric pressure H2/Ar annealing) do not show this surprising effect. We will discuss the main difference caused by the high H2 pressure annealing and the origin of this outstanding activity of black titania. REFERENCES Roy, S. Berger, P. Schmuki, Angew. Chem. Int. Ed. (2011), 2904Lee, A. Mazare, P. Schmuki, CHEMICAL REVIEWS, 114 (2014) 9385Liu, P. Schmuki et.al. Nano Letters, 14 (2014) 3309Liu, P. Schmuki et.al. 53 (2014) 14201
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