Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 94: Oxides and insulators: Adsorption and reaction of small molecules

O 94.5: Vortrag

Freitag, 13. März 2026, 10:45–11:00, HSZ/0204

Characterization of CO₂ adsorption configurations on stoichiometric, reduced and hydroxylated In₂O₃ — •Sarah Tobisch¹, Andreas Ziegler², Sarah Horak¹, Marco Knapp¹, Michele Riva¹, Michael Schmid¹, Ulrike Diebold¹, Bernd Meyer², and Margareta Wagner¹ — ¹TU Wien, Vienna, Austria — ²FAU-Erlangen-Nürnberg, Erlangen, Germany

CO₂ reduction to methanol is a promising pathway towards a more circular economy, converting CO₂ into valuable fuels and feedstock for the chemical industry. In₂O₃-based catalysts have gained lots of attention in recent years due to their high selectivity towards methanol synthesis. Since catalytic reactions typically take place at the interface, it is important to understand how CO₂ molecules interact and adsorb on the surface on an atomic level.
In this work, the adsorption of CO₂ molecules was studied on three different In₂O₃(111) surfaces: stoichiometric, reduced, and hydroxylated. We present atomically resolved non-contact AFM images which allow for the identification of the adsorption sites of all individual molecules. The CO₂-saturated, stoichiometric In₂O₃(111) shows long range order, albeit breaking the three-fold symmetry of the surface. Missing contrast inversion in nc-AFM combined with XPS measurements result in the identification of physisorbed and carbonate species. DFT calculations confirm adsorption sites and orientation of the individual molecules. CO₂ shows similar motifs on the reduced surface but partly displaces the In adatoms. On the hydroxylated surface, the OH groups block adsorption of CO₂ and long-range order is not observed.

Keywords: nc-AFM; Indium Oxide; CO2 reduction