Publication date: 15th December 2014
Hydrogen production through photo-induced splitting of water is a promising avenue for sustainable energy economy, although no cost-effective photocatalytic system has been identified so far. It is believed that a successful search for a new and improved photocatalyst will be based on a molecular understanding of all elementary reaction steps in the photocatalytic water splitting. The rate determining part in the photocatalytic splitting of water is the oxygen evolution reaction (due to the 4-electron process: OER). Therefore co-catalysts, such as RuO2, the best catalyst known for OER, are frequently co-added. The combined system of single crystalline TiO2(110) model photocatalysts and ultrathin RuO2 films provides atomic-scale control of the interface that in turn is highly beneficial for electronic and structural characterization as well as the identification of elementary reaction steps in the photo-induced OER. In this presentation we discuss the preparation of RuO2(110)/TiO2(110) model systems for photocatalytic water splitting on the basis of single-crystalline TiO2(110). The RuO2(110)/TiO2(110) model system is extensively characterized by surface sensitive methods (in-situ) as well as theoretical (ab-initio) photo-electrochemical methods. Single crystallinity of the model systems is required to allow for a direct comparison of ab-initio calculations with corresponding experiments.
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