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Desolvation of Ions in Subnanometer Pores and Its Effect on Capacitance and Double-Layer Theory

Chmiola, John and Largeot, Céline and Taberna, Pierre-Louis and Simon, Patrice and Gogotsi, Yury Desolvation of Ions in Subnanometer Pores and Its Effect on Capacitance and Double-Layer Theory. (2008) Angewandte Chemie International Edition, 47 (18). 3392-3395. ISSN 1433-7851

(Document in English)

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Official URL: http://dx.doi.org/10.1002/anie.200704894


The study of charged solid–liquid interfaces, manifested as “double layers”, represents a problem of both practical and scientific importance. Double layers are present in all electrolyte solutions and have been traditionally studied using planar noble-metal electrodes and mercury drops. However, in the ionic channels in cells or the small-diameter pores of electrochemical double-layer capacitors (EDLCs),ions are in a very confined situation, which is different from that of a planar solid/electrolyte interface. By using nanoporous carbon with pores smaller than the size of an ion and a single associated solvent molecule, we show that the implicit assumption that double layers are governed only by ion/ electrode charge separation may be short-sighted. Other factor may play a more dominant role than previously thought, for example, increasing the confinement of the ions leads to an increase in the capacitance. Including the effect of partially desolvating ions in the current double-layer theory could lead to a better understanding of the behavior of ions in confined environments.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://www3.interscience.wiley.com The original PDF of the article can be found at Angewandte Chemie International Edition website : http://www3.interscience.wiley.com/journal/26737/home
HAL Id:hal-03578220
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Drexel University (USA)
Laboratory name:
Deposited On:03 Jun 2009 09:49

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