SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster: Ultrafast Electron Dynamics at Surface and Interfaces II
O 37.8: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Photocatalysis on anataseTiO2(101) in real-time — •Heshmat Noei1,2, Michael Wagstaffe1, Adrian Dominguez-Castro3, Lukas Wenthaus1, Steffen Palutke1, Dmytro Kutnyakhov1, Michael Heber1, Federico Pressacco1, Sirhei Dziarzhytski1, Helena Gleißner1, Verena Kristin Gupta1, Adriel Dominguez1, Thomas Frauenheim3, Angel Rubio4, and Andreas Stierle1 — 1Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Bremen Center for Computational Material Science (BCCMS), D-28359, Bremen, Germany — 4Max Planck Institute for the Structure and Dynamics of Matter, D-22761, Hamburg, Germany
Obtaining mechanistic insight surrounding interfacial charge transfer and the role of intermediate species during photocatalysis on metal oxide surfaces is challenging due to their ultrafast nature. By applying ultra-fast optical pump-soft X-ray probe experiments at FLASH in DESY, we have obtained first insight into the activation mechanism of CO photooxidation to CO2 on rutile and anatase TiO2 surfaces and charge transfer at the interfacxe of water and TiO2(101). By using an optical laser of 800 nm and a FEL energy of 647.8 eV, the changes in the Ti 2p, O 1s and C 1s core levels have been monitored on a picosecond timescale.