Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Dielectric and Molecular/Water Interfaces

O 60.3: Talk

Wednesday, March 18, 2015, 15:30–15:45, MA 043

STM and STS of electric and photocatalytic H₂O dissociation on TiO₂ Anatase (101) — •Christian Dette¹, Miguel A. Pérez², Christopher E. Patrick², Feliciano Giustino², Soon J. Jung¹, and Klaus Kern^1,3 — ¹Max-Planck Institue for Solid State Research, D-70569 Stuttgart — ²University of Oxford, UK-OX1 3PH Oxford — ³Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne

Nanosized TiO₂ photocatalytic water-splitting technology has great potential for low-cost, environmentally friendly solar-hydrogen production to support the future hydrogen economy. However, the reaction mechanism and dynamics of the photocatalytic water dissociation on TiO₂ anatase (101) have not yet been fully understood. To resolve this ambiguity we first determine fingerprints of O, OH and H₂O on a TiO₂ anatase surface by using scanning tunneling microscopy (STM) and spectroscopy (STS) in conjunction with first principle density functional theory (DFT). These fingerprints allow us to investigate the changes in the molecular water structure and its dynamics at the interface during and after the photoreaction. Furthermore, the photon induced dissociation will be compared with the electron induced dissociation.