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J. Hulva:
"Fe₃O₄ (001) as a model system for single-atom catalysis";
Vortrag: Seminar Institut für Allgemeine Physik (IAP), TU Wien; 04.12.2018.

The rapidly emerging field of "single-atom catalysis" aims to drastically reduce the amount of precious metal required to catalyze chemical reactions by replacing nanoparticles with single-atom active sites. Although there are now many reports of active single-atom catalysts [1], the concept itself remains controversial because it is challenging to characterize real catalysts and determine the reaction mechanism. In our work, we study fundamental properties of supported single metal atoms using a surface science approach. We employ the Fe3O4 (001) surface as a model support, because it can stabilize dense arrays of single metal atoms to temperatures as high as 700 K [2,3].
In this talk, I will present a few examples of Me1/Fe3O4(001) systems and discuss how the coordination of the adatoms influences their adsorption properties. Next, I will focus on the reactivity of the Pt species and show that the (PtCO)2¬ dimers are active for CO oxidation, in contrast to the inactive adatoms.


[1] - Yang et al., Acc. Chem. Res. 46(2013), pp.1740-1748
[2] - Novotný et al., Phys.Rev.Lett.108(2012): 216103
[3] - Bliem et al., Science 346 (2014): 1215-1218