A superionic state in nano-porous double-layer capacitors : insights from Monte Carlo simulations
Kondrat, S. and Georgi, N. and Fedorov, M. V. and Kornyshev, A. A. (2011) A superionic state in nano-porous double-layer capacitors : insights from Monte Carlo simulations. Physical Chemistry Chemical Physics, 13 (23). pp. 11359-11366. ISSN 1463-9084 (https://doi.org/10.1039/c1cp20798a)
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Recently observed anomalous properties of ionic-liquid-based nanoporous supercapacitors [C. Largot et al., J. Am. Chem. Soc., 2008, 130, 2730-2731] have attracted much attention. Here we present Monte Carlo simulations of a model ionic liquid in slit-like metallic nanopores. We show that exponential screening of the electrostatic interactions of ions inside a pore, as well as the image-charge attraction of ions to the pore surface, lead to the 'anomalous' increase of the capacitance with decreasing the pore width. The simulation results are in good agreement with the experimental data. The capacitance as a function of voltage is almost constant for low voltages and vanishes above a certain threshold voltage. For very narrow pores, these two regions are separated by a peak. With increase of the pore size the peak turns into a bump and disappears for wide pores. This effect, related to a specific character of the voltage-induced filling of nanopores with counterions at high densities, is yet to be verified experimentally.
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Item type: Article ID code: 35668 Dates: DateEvent2011Published13 May 2011Published OnlineSubjects: Science > Physics Department: Faculty of Science > Physics
Technology and Innovation Centre > BionanotechnologyDepositing user: Pure Administrator Date deposited: 08 Nov 2011 10:19 Last modified: 21 Sep 2024 08:27 URI: https://strathprints.strath.ac.uk/id/eprint/35668