SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 73: Metal Substrates: Adsorption and Reaction of Small Molecules II
O 73.2: Vortrag
Donnerstag, 30. März 2023, 10:45–11:00, CHE 91
Electrooxidation of 1-cyclohexyl ethanol on Pt single crystal electrodes — •Lukáš Fusek1,2, Maria Minichová3, Valentín Briega-Martos3, Lukas Fromm1, Evanie Franz1, Juntao Yang1, Andreas Görling1, Serhiy Cherevko3, Peter Wasserchied1,3, Olaf Brummel1, and Jörg Libuda1 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Charles University, Prague, Czech Republic — 3Helmholtz-Institut Erlangen-Nürnberg, Germany
Isopropanol can be used as a liquid organic hydrogen carrier (LOHC), which is compatible with direct alcohol fuel cells.1 However, it has a limited hydrogen storage capacity. 1-Cyclohexyl-ethanol is a potential LOHC with an increased hydrogen storage capacity with two different functionalities, the alcohol (2 H+) and the cyclohexyl functionality (6 H+). In this study, we investigated the electrooxidation of 0.02 M 1-cyclohexyl ethanol on Pt(hkl) electrodes in 0.1 M HClO4 using cyclic voltammetry and electrochemical infrared reflection absorption spectroscopy. We demonstrate that it is possible to oxidize electrochemically 1-cyclohexyl-ethanol to acetophenone. Additionally, we observed 1-cyclohexyl-ethanone and decomposition products. The latter poison the Pt surface, limiting the electrocatalytic activity. The possibility to dehydrogenate electrochemically not only the alcohol but also the cyclohexyl functionality may enable us to increase the hydrogen storage capacity of fuel cell compatible LOHCs substantially, reaching values that are comparable to conventional LOHCs.
1.Sievi, G. et al. Energy Environ Sci 12, 2305-2314 (2019).