Differential Capacitance of Electric Double Layer – Influence of Asymmetric Size of Ions, Thickness of Stern Layer and Orientational Ordering of Water Dipoles

Authors

  • Aleš Iglič Faculty of Electrical Engineering, University of Ljubljana, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia
  • Ekaterina Gongadze Faculty of Electrical Engineering, University of Ljubljana, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia
  • Veronika Kralj-Iglič Faculty of Health Sciences, University of Ljubljana, Zdravstvena pot 5, SI-1000 Ljubljana, Slovenia

DOI:

https://doi.org/10.17344/acsi.2019.5495

Keywords:

Asymmetric size of ions, relative permittivity, water ordering, Stern layer, differential capacitance

Abstract

The mean-field theoretical model of the electric double layer which takes into account the asymmetric finite size of anions and cations and the orientational ordering of water dipoles in the Stern and the diffuse layers is described together with a short description of the main concepts and a brief review of the literature in the theory of the electric double layer. As an example of the application of the described mean-field lattice model of the electric double layer, the influence of different sizes of anions and cations, the influence of the thickness of the Stern layer and the influence of the orientational ordering of water molecules on the asymmetric, bimodal camel-like dependence of differential capacitance on the surface potential is theoretically considered.

The presented theoretical model of the electric double layer is flexible enough to be in the future extended to more complicated multicomponent systems with molecules of different sizes and the orientational ordering of molecules.

Author Biographies

Aleš Iglič, Faculty of Electrical Engineering, University of Ljubljana, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia

Laboratory of   Physics

head, professor

Ekaterina Gongadze, Faculty of Electrical Engineering, University of Ljubljana, Tržaška cesta 25, SI-1000 Ljubljana, Slovenia

Laboratoryof Physics

research associate

Veronika Kralj-Iglič, Faculty of Health Sciences, University of Ljubljana, Zdravstvena pot 5, SI-1000 Ljubljana, Slovenia

Laboratoryof Clinical Biophysics

head, professor

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Published

18.09.2019

Issue

Vol. 66 No. 3 (2019)

Section

Feature article

License

Except where otherwise noted, articles in this journal are published under the Creative Commons Attribution 4.0 International License