SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Poster: Surface Reactions
O 23.1: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
XPS Studies of 2-Carbethoxy-3-Phenyl-NBD/QC as MOST Energy Storage System — •Felix Hemauer1, Valentin Schwaab1, Eva Marie Freiberger1, Natalie J. Waleska1, Andreas Leng1, Hans-Peter Steinrück1, and Christian Papp1,2 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Freie Universität Berlin, Germany
Molecular solar thermal (MOST) systems are a candidate for storing solar energy in a chemical manner. The energy-lean norbornadiene (NBD) is converted to its energy-rich valence isomer quadricyclane (QC) in a photoconversion reaction, whereby the energy is stored as strain. Molecular design leads to advantageous light-harvesting properties. In a model catalytic approach, we investigated the surface chemistry of the molecule pair 2-carbethoxy-3-phenyl-NBD/QC on Pt(111), Ni(111) and gold by synchrotron radiation-based XPS. Next to in situ observation of the adsorption, temperature-programmed experiments give insights into thermally induced reactions. Hereby, information on the adsorption behavior, the feasibility of the backward reaction of the QC to the NBD derivative, and the respective stability boundaries on the catalyst surfaces is obtained. On Pt(111), the energy release reaction is found to occur between 140 and 230 K. For Ni(111), the back conversion cannot be triggered thermally; instead, individual decomposition routes are monitored. The gold surface shows the highest catalytic activity with an instantaneous reaction upon adsorption at 110 K. The DFG (Project No. 392607742) supported this work. We thank HZB for allocation of synchrotron radiation beamtime.