Double Layer in Ionic Liquids: Overscreening versus Crowding

Martin Z. Bazant, Brian D. Storey, and Alexei A. Kornyshev
Phys. Rev. Lett. 106, 046102 – Published 24 January 2011; Erratum Phys. Rev. Lett. 109, 149903 (2012)
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Abstract

We develop a simple Landau-Ginzburg-type continuum theory of solvent-free ionic liquids and use it to predict the structure of the electrical double layer. The model captures overscreening from short-range correlations, dominant at small voltages, and steric constraints of finite ion sizes, which prevail at large voltages. Increasing the voltage gradually suppresses overscreening in favor of the crowding of counterions in a condensed inner layer near the electrode. This prediction, the ion profiles, and the capacitance-voltage dependence are consistent with recent computer simulations and experiments on room-temperature ionic liquids, using a correlation length of order the ion size.

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  • Received 1 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.046102

© 2011 American Physical Society

Erratum

Erratum: Double Layer in Ionic Liquids: Overscreening versus Crowding [Phys. Rev. Lett. 106, 046102 (2011)]

Martin Z. Bazant, Brian D. Storey, and Alexei A. Kornyshev
Phys. Rev. Lett. 109, 149903 (2012)

Authors & Affiliations

Martin Z. Bazant1, Brian D. Storey2, and Alexei A. Kornyshev3

  • 1Departments of Chemical Engineering and Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 USA
  • 2Franklin W. Olin College of Engineering, Needham, Massachusetts 02492, USA
  • 3Department of Chemistry, Imperial College London, SW7 2AZ London, U.K.

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Issue

Vol. 106, Iss. 4 — 28 January 2011

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