Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 22: Organic-Inorganic Hybrid Systems and Organic Films
O 22.14: Poster
Monday, March 7, 2016, 18:15–20:30, Poster E
On the Adsorption Behavior of Ionic Liquid (Sub-)monolayers on Model Electrode Surfaces and their Interaction with Coadsorbed Lithium — •Florian Buchner1, Katrin Forster-Tonigold1, Maral Bozorgchenani2, Bendikt Uhl2, Axel Gross1,3, and R. Jürgen Behm1,2 — 1Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage, D-89081 Ulm, Germany — 2Ulm University, Institute of Surface Chemistry and Catalysis, D-89069 Ulm, Germany — 3Ulm University, Institute of Theoretical Chemistry, D-89069 Ulm, Germany
Ionic Liquids (ILs) as 1-butyl-1-methylpyrrolidinium bis(tri-fluoromethylsulfonyl)imide [BMP][TFSA] have become attractive candidates for battery electrolytes. In this model study we investigated the adsorption behavior of (sub-)monolayers of [BMP][TFSA] on metallic substrates and now also on graphite(0001) as frequently used anode material under ultrahigh vacuum (UHV) conditions, applying scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and dispersion corrected density functional theory (DFT-D) calculations. After vapor deposition at 300 K, XPS reveals a 1:1 ratio of cations : anions on Ag(111) and graphite(0001). Upon subsequent cool-down to 100 K, STM demonstrates ordered molecular arrangements, which clearly differ on both surfaces; a detailed comparison is given in terms of adsorption geometry, intermolecular and substrate- adsorbate interactions. In addition, we investigated the interaction with coadsorbed Li, which resulted in a decomposition of the ions. This will be discussed based on ongoing DFT-D calculations.