Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 87: Focussed Session: Solid-liquid Interfaces III

O 87.3: Vortrag

Freitag, 15. März 2013, 11:00–11:15, H31

Structure and Dynamics of Ionic Liquid-Electrode Interfaces — •Peter Reichert¹, Jannis Ochsmann¹, Kasper Skov Kjaer², Tim Brandt van Driel², Martin Meedom Nielsen², Harald Reichert³, Diego Pontoni³, and Markus Mezger¹ — ¹Max-Planck-Institut für Polymerforschung, Mainz — ²Technical University of Denmark and Riso National Lab, Roskilde — ³European Synchrotron Radiation Facility, Grenoble

Ionic liquids (ILs) are promising electrolytes for electrochemical double-layer capacitors with high energy storage densities. To understand and optimize their capacitance as well as charging and discharging processes, detailed information of the IL molecular scale structure and dynamics at interfaces, i.e. the spatial density profiles of the ions near an electrode, is highly desirable. Analysis of our in-situ high-energy x-ray reflectivity (XRR) experiments on IL-electrode interfaces under potential control revealed oscillatory profiles comprised of alternating anion and cation enriched regions. The relaxation dynamics of the interfacial structure upon potential variation was studied by time resolved XRR experiments on a sub-millisecond timescale. The molecular scale structure and its dynamics are set in relation to differential capacitance curves measured by impedance spectroscopy.