Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 71: Focus Session: Nanoscale Insights into Interfacial Electrochemistry II
O 71.3: Invited Talk
Wednesday, March 14, 2018, 15:30–16:00, HE 101
XPS of ionic liquids: from half-cell to in situ electrochemical measurements — •Annette Foelske-Schmitz1, Markus Sauer1, Daniel Weingarth2, and Rüdiger Kötz3 — 1TU Wien, Vienna, Austria — 2Heraeus Holding GmbH, Hanau, Germany — 3Paul Scherrer Institut, Villigen, Switzerland
XPS is widely accepted to be a powerful tool to study electrochemically induced changes of the electrode/electrolyte interface. As electrochemical experiments are commonly performed under atmospheric pressure, XPS is usually not applied directly in the analyser chamber. Therefore, three experimental approaches may be distinguished: (i) ex situ, (ii) quasi in situ, and, (iii) in situ EC XPS [1]. The in situ approach may be realised using UHV compatible electrolytes such as ionic liquids (IL). IL are also known to provide large electrochemical stability windows making them attractive for certain electrochemical applications, such as double layer capacitors or lithium ion batteries. In this contribution quasi in situ [2] and in situ [3] EC XPS setups as well as half-cell measurements of IL [4] will be presented and discussed with respect to investigations of interfacial behaviour, stability windows, and interpretation of XPS data.
[1] A. Foelske-Schmitz, Ref. Mod. Chem., Mol. Sci. Chem. Eng., Elsevier, in press [2] A. Foelske-Schmitz, D. Weingarth, R. Kötz, Electrochim. Acta 56 1032 (2011)[3] D. Weingarth, A. Foelske-Schmitz, A. Wokaun, R. Kötz, Electrochem. Commun. 13 619 (2011)[4] A. Foelske-Schmitz, M. Sauer, JESRP, in press