Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 3: Focus Session: Single Atom Catalysis 1

O 3.2: Vortrag

Montag, 5. September 2022, 11:00–11:15, H4

Single atom co-catalyst dispersion on KTaO3 (001) by surface polarity compensation. — •Aji Alexander1, Jesús Redondo1, Dominik Wrana1, Lukáš Fusek1, Viktor Johánek1, Josef Mysliveček1, and Martin Setvin1,21Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic — 2Institute of Applied Physics, TU Wien, Vienna, Austria

Redox chemistry on perovskite surfaces attracts attention due to these materials* promising catalytic properties, good ability to separate electron-hole pairs in light-harvesting, and the presence of ferroelectricity in many perovskites. This work focuses on enhancing catalytic activity achieved by activating the perovskite surface with extrinsic metals. Combined STM/AFM measurement together with XPS data shows the tendency of the cobalt atoms to disperse in the form of single adatoms on the polarity uncompensated KTaO3 (001) surface [1]. The interaction of cobalt with KTO surfaces was studied under various reducing and oxidizing conditions, as well as a function of temperature. This, in turn, will allow characterization of the metallic, oxide, and hydroxide phases of cobalt in dependence on the environment. The work was supported by projects GACR 20-21727X and GAUK Primus/20/SCI/009. [1] M. Setvin, M. Reticcioli, F. Poelzleitner et al., Science 359, 572 (2018)

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