[Zurück]

A. Rafsanjani-Abbasi, F. Kraushofer, M. Eder, J. Pavelec, L. Haager, G. Franceschi, M. Riva, M. Schmid, U. Diebold, G. Parkinson:
"Thermal stability and CO-induced mobility of single Pt adatoms supported on the α−Fe₂O₃(1102) surface";
Poster: DPG-Frühjahrstagung (DPG Spring Meeting) of the Surface Science Division, SurfaceScience21, virtual; 04.03.2021.

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.