Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Solid-Liquid Interfaces: Reactions and Electrochemistry

O 72.9: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

Towards understanding the mechanism of water splitting on TiO2 — •Simon J. Schmitt, Saman Hosseinpour, and Ellen H.G. Backus — Max-Planck-Institute for Polymer Research, Ackermannweg 10, Mainz, Germany

Finding a clean and renewable energy source to replace fossil fuels has attracted much attention, the past few decades, as a requirement for the sustainable development of societies. Direct hydrogen generation on TiO2 by photocatalytic dissociation of water using sunlight was already proposed more than 40 years ago. However, despite extensive work in this area, the fundamentals of the process remain ill-understood, mainly due to the lack of a proper tool to specifically explore the interface between water and TiO2. Sum frequency generation spectroscopy (SFG), is an inherently surface sensitive tool, allowing the study of specifically the water molecules at the TiO2 surface. We present data on water in contact with TiO2 thin films at various pH values and isotopic dilution and correlate the spectral observations with surface species. Moreover, we show first UV-pump-SFG-probe data, illustrating the first steps towards following the photo-induced dissociation of water at the TiO2 interface in real-time.

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