SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 101: Poster Session VIII: Oxides and insulators: Adsorption and reaction of small molecules II
O 101.5: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Thermal stability and CO-induced mobility of single Pt adatoms supported on the α−Fe2O3(1102) surface — •Ali Rafsanjani-Abbasi1, Florian Kraushofer1, Moritz Eder2, Jiri Pavelec1, Lena Haager1, Giada Franceschi1, Michele Riva1, Michael Schmid1, Ulrike Diebold1, and Gareth S. Parkinson1 — 1Institute of Applied Physics, TU Wien, Wiedner Hauptstraße 8-10/E134, 1040 Wien, Austria — 2Chair of Physical Chemistry, TU München, Lichtenbergstraße 4, 85748 Garching, Germany
Pt-based catalysts are the most efficient catalysts for the hydrogen evolution reaction and are also widely used for photocatalytic and CO-oxidation reactions. However, the high cost of Pt and its susceptibility to carbon monoxide poisoning are two drawbacks on its role as a catalyst. Downsizing catalyst clusters to single atoms is an effective way to reach maximum efficiency, and so-called "Single-Atom Catalysis" is now an important field of research [1]. Nevertheless, stabilization of single Pt atoms on a support without compromising catalytic activity is still a key challenge.
Here, we present a study of the thermal stability and CO-induced mobility of single Pt atoms on the α−Fe2O3(1102) surface, at elevated temperatures and in a CO-containing environment. Thermally-induced and CO-induced sintering of the Pt single atoms are traced by means of STM and XPS. In addition, in time-lapse series the mobility and rearrangement of single Pt adatoms have been determined with varying carbon monoxide pressure in the background.
1. G. S. Parkinson, Catal. Lett. 149, 1137 (2019).