Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Organic/bio Molecules on Metal Surfaces V

O 52.8: Vortrag

Mittwoch, 13. März 2013, 17:45–18:00, H38

The metal | ionic liquid interface: Adsorption behavior of ionic liquid adlayers on Cu(111) — Stephan Gabler^{1, 2}, •Benedikt Uhl^{1, 2}, Florian Buchner^{1, 2}, and R. Jürgen Behm¹ — ¹Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — ²Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, D-89069 Ulm, Germany

Ionic liquids (IL's) are promising electrolytes in Li-Ion batteries. The behavior of IL's at the electrode | electrolyte interface is crucial for the performance of such electrochemical systems, studies on this topic, however, are at their very beginning. In this work, we investigated the adsorption behavior of 1-Butyl-1-methylpyrrolidinium-bis(trifluoromethylsulfonyl)imide (BMP TFSA) on Cu(111) in the submonolayer and monolayer range. Combined STM and XPS investigations were conducted under UHV conditions and at temperatures between 100 K and 298 K. Compared to the XPS bulk signals, additional peaks are found in the N1s and S2p region for thin BMP-TFSA adlayers. The additional S2p peak indicates a sulfidic species on the surface (e.g. Cu2S), which we assume is due to a partial decomposition of the anion. In STM, two different structures are observed on the surface: the first is stable at room temperature and the second is solely found below 170 K. Additionally the Cu-steps are altered, which indicates the participation of the metal surface in the decomposition reaction. Presumably, the first structure represents decomposition products and the second one intact IL molecules.