Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 81: Heterogeneous Catalysis III
O 81.7: Vortrag
Donnerstag, 20. März 2025, 12:00–12:15, H6
Interaction of single cobalt co-catalyst atoms with the SrTiO3(001) surface — •Aji Alexander1, Pankaj Kumar Samal1, Llorenç Albons1, Jan Škvára1, Dominik Wrana2, Viktor Johánek1, Josef Myslivecek1, and Martin Setvin1 — 1Department of Surface and Plasma Science, Charles University, Prague, Czech Republic — 2Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
Perovskite surfaces attract attention in the catalysis community due to their promising chemical properties, ability to separate electron-hole pairs for light harvesting, and ferroelectricity in various phases. Understanding metal clusters, specifically their electronic structure and atomic utilization efficiency, is crucial for developing more efficient and sensitive catalysts.
This work focuses on the atomic structure of doped SrTiO3(001) perovskite surface and the potential to modify its catalytic activity by the presence of extrinsic metals, with the main focus on cobalt. Combined STM/AFM, LEED, and XPS show a combination of cobalt clustering and dispersion within an ordered reconstruction. We will highlight how cobalt interacts with perovskite surfaces at different reducing conditions and explain the various phases of the supported cobalt as a function of temperature.
The work was supported by projects MSMT LL2324, GACR 20-21727X, and GAUK 10/252122. The work was supported by projects GAUK 10/252122, GACR 20-21727X, and GAUK Primus/20/SCI/009.
Keywords: Perovskite; STM/AFM; surface reconstructions; XPS; single atom