Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 73: Surface Dynamics: Reactions and Elementary Processes

O 73.3: Poster

Mittwoch, 9. März 2016, 18:15–20:30, Poster A

In-situ UPS and high-resolution XPS investigations on the norbornadiene/quadricyclane energy storage system on different metal substrates — •Udo Bauer, Philipp Bachmann, Christian Papp, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Germany

Fossil fuel-based energy technologies lack a long-term perspective. The further development of existing renewable energy concepts is needed regarding energy distribution and storage. One possible scenario is the storage of energy by chemical means in the form of strained organic molecules, e.g. the multi-cyclic hydrocarbon quadricyclane (QC) and its strain-released counterpart norbornadiene (NBD). By absorption of light, NBD is transformed to the energy rich QC, followed by a catalytic energy release to reform NBD. We investigated the adsorption as well as the conversion of QC to NBD and their decomposition over different catalytically active metal surfaces. Ultraviolet photoelectron spectroscopy (UPS) provides characteristic spectra of NBD/QC on Ni(111) and Au/Ni(111) but not on Pt(111). By applying heating ramps, we observe the conversion of QC to NBD at certain temperatures except for the Pt(111) surface, where the reaction takes place below 120 K. HR-XPS (high-resolution X-ray photoelectron spectroscopy) spectra of the adsorption (120 K) and during the heating ramps reflect the different interaction strength between molecules and surface and reveal a fundamentally changed decomposition behavior of NBD at higher temperatures for each surface. The work was supported by the Cluster of Excellence Engineering of Advanced Materials (EAM).