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O: Fachverband Oberflächenphysik
O 65: Solid-liquid interfaces: Reactions and electrochemistry II
O 65.4: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, TRE/PHYS
Formic Acid Oxidation on Gold Electrodes — •Johannes M. Hermann1, Areeg Abdelrahman1, Heiko Müller1, Ludwig A. Kibler1, and Timo Jacob1,2,3 — 1Institute of Electrochemistry, Ulm University, Ulm, Germany — 2Helmholtz-Institute-Ulm (HIU), Ulm, Germany — 3Karlsruhe Institute of Technology, Karlsruhe, Germany
Adsorption processes are an integral part of electrocatalysis. The use of extensively studied and structurally well-defined Au(111) single crystal electrodes allows for a better understanding of such processes. Formally, the formic acid oxidation (FAOR) is a relatively simple reaction as only one proton and two electrons have to be released to obtain CO2. However, the reaction exhibits a self-inhibition on Au(111) electrodes due to the blocking of active sites by strongly adsorbed formate indicated by a bell-shaped current density-potential curve [1]. Similarly, the addition of specifically adsorbing anions typically lowers the catalytic activity [2]. In contrast, certain adsorbates enhance the reaction by orders of magnitude. An intersting example is irreversibly adsorbed 4-mercaptopyridine forming a self-assembled monolayer (SAM) on Au(111) with the enhancement being related to the highly ordered SAM structure [3]. Several aspects of FAOR on gold single crystals will be discussed.
[1] L.A. Kibler, M. Al-Shakran, J. Phys. Chem. C 120 (2016) 16238*16245. [2] J.M. Hermann, A. Abdelrahman, T. Jacob, L.A. Kibler, Electrochim. Acta 385 (2021) 138279. [3] J.M. Hermann, H. Müller, L. Daccache, C. Adler, S. Keller, M. Metzler, T. Jacob, L.A. Kibler, Electrochim. Acta 388 (2021) 138547.
Keywords: gold single crystal electrode; competitive adsorption; probe reaction; formic acid oxidation