Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster Session I

CPP 20.42: Poster

Montag, 12. März 2018, 17:30–19:30, Poster A

1H and 19F PFG NMR of choline-based ionic liquids in bulk and in carbon fibers — •Emmanouil Veroutis, Steffen Merz, Markus Gehring, Rüdiger Eichel, and Josef Granwehr — Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research - Fundamental Electrochemistry (IEK-9), 52428 Jülich, Germany

In recent years great interest has been attracted by room temperature ionic liquids (RTILs) due to their potential as new media for organic, catalytic and electrochemical applications. Given their interesting properties, such as very low vapor pressure, non-flammability, high thermal stability and wide electrochemical window, ILs are proposed as electrolytes for batteries. Despite of this research attention, electrolyte ILs and their interactions with electrodes in battery systems still remain poorly characterized.

In this study we present 1H and 19F Pulsed Field Gradient (PFG) NMR measurements on choline-based ionic liquids in bulk as well as confined in electrospun carbon fibers. The self-diffusion coefficients of the cation and the anion have been measured and correlated with electrochemical parameters, such as molar conductivity, transference numbers and ionicity. Furthermore, the interactions of cation and anion, but also the interaction with the carbon fibers have been examined by means of Nuclear Overhauser Effect Spectroscopy (NOESY) NMR, which provides through-space correlations between nearby nuclei. Finally, the influence of water on the physicochemical parameters of the studied ionic liquids has also been addressed by NMR.