Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster: Charged Soft Matter
CPP 33.7: Poster
Wednesday, March 13, 2013, 16:30–18:30, Poster C
Charge transport and electrode polarization at the interface between glass forming ionic liquids (ILs) and metal electrodes — •Ludwig Popp, Ciprian Ghiorghita Iacob, Wycliffe Kiprop Kipnusu, Martin Treß, Joshua Rume Sangoro, and Friedrich Kremer — Institute of Experimental Physics I, Leipzig, Germany
Charge transport and electrode polarization phenomena are investigated in a homologous series of imidazolium-based ionic liquids by broadband dielectric spectroscopy (BDS) in a large temperature (190 - 300 K) and frequency range (10−3 − 105 Hz). The dielectric spectra are dominated − on the low frequency side − by electrode polarization, while, for higher frequencies, charge transport (in a disordered matrix) is the underlying physical mechanism. The absolute values of dc conductivity vary over 5 decades upon systematic variation of ILs structure and electrode material. A microscopic model is applied to quantitatively describe the electrode polarization. The applicability of the model to the experimental data in a broad frequency range is discussed in more details [1-4].
References: [1]. Serghei, A. et al. (2009), Phys. Rev. B, 80(18), 184301-5, [2]. Dyre, J. C. (1988), Phys. Rev. B, 37(17), 10143-10149, [3]. Sangoro, J. R., Ph.D. Thesis, (2010), University of Leipzig, [4]. Kremer, F., Schönhals, A. (2003), Broadband Dielectric Spectroscopy, Springer, Berlin.