Dresden 2020 – wissenschaftliches Programm
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O 109.1: Vortrag
Donnerstag, 19. März 2020, 15:00–15:15, TRE Phy
Photoinduced CO Oxidation on N-doped TiO2 — •Helena Gleißner1, Michael Wagstaffe1, Heshmat Noei1, and Andreas Stierle1,2 — 1DESY NanoLab, Deutsches Elektronen-Synchrotron, Hamburg — 2Fachbereich Physik, Universität Hamburg
Modification of the electronic structure in TiO2 is a crucial factor for developing more efficient and visible light sensitive photocatalysts . We studied the effect of nitrogen doping on the photoactivity of the rutile (110) and anatase (101) surfaces for the CO oxidation to CO2 under UV illumination. Rutile (110) and anatase (101) single crystals were doped with nitrogen via ion implantation and their surfaces were characterized using low energy electron diffraction (LEED). The low energy electron diffraction patterns of the doped surfaces reveal no reconstruction. The nitrogen incorporation and CO oxidation were examined by X-ray Photoelectron Spectroscopy (XPS). The CO oxidation was performed at 97 K under UV illumination of 365 nm and the O 1s and C 1s core levels were measured to monitor CO and CO2 species. On rutile (110), the CO oxidation rate was slightly enhanced compared to the undoped surface, while on anatase (110) the inhibition of the reaction increased with the dopant concentration.
 Ulrike Diebold, The surface science of titanium dioxide, U. Surf. Sci. Rep. 48, 53-229 (2003).