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Advances in Physical Chemistry
Volume 2011 (2011), Article ID 786759, 20 pages
http://dx.doi.org/10.1155/2011/786759
Review Article

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO2-Based Nanomaterials

1Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätstr 150, NC4/073, D-44780 Bochum, Germany
2Materials Research Department, Ruhr University Bochum, D-44801 Bochum, Germany
3Research Department Interfacial Systems Chemistry, Ruhr University Bochum, D-44801 Bochum, Germany

Received 30 September 2011; Accepted 15 December 2011

Academic Editor: Konstantin Neyman

Copyright © 2011 Radim Beranek. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

TiO2-based nanomaterials play currently a major role in the development of novel photochemical systems and devices. One of the key parameters determining the photoactivity of TiO2-based materials is the position of the band edges. Although its knowledge is an important prerequisite for understanding and optimizing the performance of photochemical systems, it has been often rather neglected in recent research, particularly in the field of heterogeneous photocatalysis. This paper provides a concise account of main methods for the determination of the position of the band edges, particularly those suitable for measurements on nanostructured materials. In the first part, a survey of key photophysical and photochemical concepts necessary for understanding the energetics at the semiconductor/solution interface is provided. This is followed by a detailed discussion of several electrochemical, photoelectrochemical, and spectroelectrochemical methods that can be applied for the determination of band edge positions in compact and nanocrystalline thin films, as well as in nanocrystalline powders.