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A mean-field theory on the differential capacitance of asymmetric ionic liquid electrolytes. II. Accounts of ionic interactions

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Abstract

A size-asymmetric mean-field theory with ionic interactions is developed for the electric double layer of room temperature ionic liquid (IL) electrolytes, based on the previous work on non-interacting ions (Y. Han et al., J. Phys.: Condens. Matter, 2014, 26, 284103). By solving the modified Poisson–Boltzmann equation with some simplified assumptions following a recent work (Z. A. H. Goodwin et al., Electrochim. Acta, 2017, 225, 190–197), an analytical expression of differential capacitance can be derived, with a scaled electrode potential due to the ionic interactions. Compared with non-interacting ions, the main effect of ionic interactions is the insufficient screening of the electrode potential, and this depresses the differential capacitance compared with the non-interactive case.

Graphical abstract: A mean-field theory on the differential capacitance of asymmetric ionic liquid electrolytes. II. Accounts of ionic interactions

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Publication details

The article was received on 09 May 2018, accepted on 05 Jun 2018 and first published on 05 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP02943A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    A mean-field theory on the differential capacitance of asymmetric ionic liquid electrolytes. II. Accounts of ionic interactions

    L. Yin, Y. Huang, H. Chen and T. Yan, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP02943A

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