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Capacitance of the Double Layer Formed at the Metal/Ionic-Conductor Interface: <?format ?>How Large Can It Be?

Capacitance of the Double Layer Formed at the Metal/Ionic-Conductor Interface: How... The capacitance of the double layer formed at a metal/ionic-conductor interface can be remarkably large, so that the apparent width of the double layer is as small as 0.3 Å. Mean-field theories fail to explain such large capacitance. We propose an alternate theory of the ionic double layer which allows for the binding of discrete ions to their image charges in the metal. We show that at small voltages the capacitance of the double layer is limited only by the weak dipole-dipole repulsion between bound ions, and is therefore very large. At large voltages the depletion of bound ions from one of the capacitor electrodes triggers a collapse of the capacitance to the mean-field value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Capacitance of the Double Layer Formed at the Metal/Ionic-Conductor Interface: <?format ?>How Large Can It Be?

Skinner, Brian; Loth, M. S; Shklovskii, B. I
Physical Review Letters , Volume 104 (12) – Mar 26, 2010
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References (10)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2010 The American Physical Society
ISSN
1079-7114
DOI
10.1103/PhysRevLett.104.128302
pmid
20366568
Publisher site
See Article on Publisher Site

Abstract

The capacitance of the double layer formed at a metal/ionic-conductor interface can be remarkably large, so that the apparent width of the double layer is as small as 0.3 Å. Mean-field theories fail to explain such large capacitance. We propose an alternate theory of the ionic double layer which allows for the binding of discrete ions to their image charges in the metal. We show that at small voltages the capacitance of the double layer is limited only by the weak dipole-dipole repulsion between bound ions, and is therefore very large. At large voltages the depletion of bound ions from one of the capacitor electrodes triggers a collapse of the capacitance to the mean-field value.

Journal

Physical Review Letters – American Physical Society (APS)

Published: Mar 26, 2010

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