Abstract
The electrical and dielectric properties of ionic liquids measured by broadband dielectric spectroscopy are analyzed in detail, in order to determine the characteristic frequencies governing the spectral dependence of electrode polarization effects. A universal behavior is revealed: plotting the characteristic frequencies as a function of the DC-conductivity for a large variety of ionic liquids, single collapsing curves are obtained. This is due to the fact that the charge carriers present in ionic liquids have comparable molecular dimensions. Furthermore, an analytical approach is developed in order to determine, using the dielectric signature of electrode polarization effects, the dielectric properties of ionic liquids at metal interfaces. A new relaxation process taking place in the nanometric interphases formed at the contact with the measurement electrodes is reported. It is assigned to an exchange process between the interphase and the bulk.
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Serghei, A., Samet, M., Boiteux, G., Kallel, A. (2016). Dielectric Properties of Ionic Liquids at Metal Interfaces: Electrode Polarization, Characteristic Frequencies, Scaling Laws. In: Paluch, M. (eds) Dielectric Properties of Ionic Liquids. Advances in Dielectrics. Springer, Cham. https://doi.org/10.1007/978-3-319-32489-0_8
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DOI: https://doi.org/10.1007/978-3-319-32489-0_8
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