SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Solid-Liquid Interfaces III: Reactions and Electrochemistry II
O 96.9: Vortrag
Freitag, 31. März 2023, 12:30–12:45, TRE Phy
Initial Stages of Cathodic Corrosion of Au(111) in an Ionic Liquid — Maren-Kathrin Heubach1, Fabian M. Schuett1, Areeg Abdelrahman1, Ludwig A. Kibler1, Timo Jacob1,2,3, and •Yannick Mattausch1 — 1Institute of Electrochemistry, Ulm University, Ulm, Germany. — 2Helmholtz-Institute-Ulm (HIU), Ulm, Germany. — 3Karlsruhe Institute of Technology, Karlsruhe, Germany.
At potentials negative of 0 V vs. SHE, noble metal surfaces can be etched by a phenomenon called ’cathodic corrosion’.1 For this process, absence of protons and presence of stabilising cations and adsorbed hydrogen at the electrode-electrolyte interface are required.2 Even if the presence of water plays an important role,3 in non-aqueous electrolytes such as ionic liquids, cathodic corrosion can take place as well.4
In this study, the cathodic corrosion of Au(111) in the hydrophobic ionic liquid N-methyl-N-propylpiperidinium bis(trifluoromethane-sulfonyl)imide ([MPPip][TFSI]) was studied by in situ scanning tunnelling microscopy. Hereby, the formation of equidistant holes at the so-called ’elbows’ of the Au(111) herringbone reconstruction was observed. Additionally, it was found that the water content plays a crucial role in the corrosion potential and extent. The higher the water content, the less negative is the onset potential of the cathodic corrosion and the more pits are formed at this potential.
[1] T. J. P. Hersbach, et al. Curr. Opin. Electrochem. 2021, 26, 100653. [2] A. I. Yanson, et al. Angew. Chemie Int. Ed. 2011, 50, 6346-6350. [3] M. M. Elnagar, et al. Electrochem. Sci. Adv. 2021, e2100175. [4] F. Lu, et al. RSC Adv. 2013, 3, 18791.