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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)
CPP 9.17: Poster
Monday, March 11, 2013, 17:30–19:30, Poster C
Interaction of Ta and Nb based salts with ionic liquids — Stefan Krischok1, Adriana Ispas1, •André Zühlsdorff1, Angela Ulbrich1, Andreas Bund1, and Frank Endres2 — 1Technische Universität Ilmenau, Institut für Mikro- und Nanotechnologien, 98693 Ilmenau, Germany — 2Clausthal University of Technology, Institute of Electrochemistry, 38678 Clausthal-Zellerfeld, Germany
We have analyzed the changes of the surface properties of the ionic liquids (ILs) 1-butyl 1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl)-amide ([BMP][TFSA]) and 1-methyl-3-propyl imidazolium bis(trifluoromethylsulfonyl)amide ([PMIm][TFSA]) with and without dissolved NbF5 and TaF5 by X-ray photoelectron spectroscopy (XPS). The relative intensities of core level emission agree very well with the expected stoichiometry. Moreover, the observed chemical shifts are in agreement with the chemical structure. Upon solution of the salts the situation changes drastically. In particular a strong modification of the cation/anion ratio is observed. With increasing amounts of TaF5 and NbF5 both, the Ta or Nb concentration and the cation anion ratio increases in the near surface region. Additionally a new salt induced F component appears in the XPS spectra. The detected TaF5 (NbF5) concentration in comparison to the nominal volume concentration and the correlation with the observed [TFSA] depletion in the surface region will be discussed in more detail. Finally, results on more complex metal salts will be presented. A fundamental understanding of the investigated interaction processes provides the basis for future studies on electrochemical processes in these systems.