Regensburg 2022 – wissenschaftliches Programm

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

O: Fachverband Oberflächenphysik

O 52: Poster Wednesday: Adsorption and Catalysis 2

O 52.3: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

Surface Chemistry of the MOST Energy Storage System 2-Carbethoxy-3-Phenyl-Norbornadiene/Quadricyclane — •Felix Hemauer, Cornelius Weiß, Johann Steinhauer, Valentin Schwaab, Hans-Peter Steinrück, and Christian Papp — Friedrich-Alexander-Universität, Erlangen, Germany

The intermittent character of renewable energy sources gives the necessity for novel energy storage technologies. So-called molecular solar thermal (MOST) energy systems directly combine the light-harvesting process with storing the gained energy as molecular strain. In a photoconversion reaction, the energy-lean norbornadiene (NBD) is converted to its energy-rich valence isomer quadricyclane (QC). By derivatization of the molecular framework, the light-harvesting properties of the molecules are optimized.

The pair 2-carbethoxy-3-phenyl-NBD/QC was investigated as model system for heterogeneously catalyzed energy release. X-ray photoelectron spectroscopy was employed to study the adsorption and thermal evolution on a Ni(111) and Pt(111) surface, respectively. An unambiguous identification of the QC and NBD derivatives at low temperature was possible on both surfaces. In case of nickel, no cycloreversion of the QC derivative to NBD was found, but individual decomposition routes setting in at about 170 K. For platinum, the back conversion under energy release was found to start at 150 K and being completed at 230 K. Above 300 K, a fragmentation into carbonaceous species occurred. The work was supported by the DFG (Project No. 392607742) and the HZB for allocation of synchrotron radiation beamtime.