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On the molecular origin of supercapacitance in nanoporous carbon electrodes

Merlet, Céline and Rotenberg, Benjamin and Madden, Paul Anthony and Taberna, Pierre-Louis and Simon, Patrice and Gogotsi, Yury and Salanne, Mathieu On the molecular origin of supercapacitance in nanoporous carbon electrodes. (2012) Nature Materials, 11 (4). 306-310. ISSN 1476-1122

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Official URL: http://dx.doi.org/10.1038/NMAT3260

Abstract

Lightweight, low-cost supercapacitors with the capability of rapidly storing a large amount of electrical energy can contribute to meeting continuous energy demands and effectively levelling the cyclic nature of renewable energy sources1. The excellent electrochemical performance of supercapacitors is due to a reversible ion adsorption in porous carbon electrodes. Recently, it was demonstrated that ions from the electrolyte could enter sub nanometre pores, greatly increasing the capacitance2, 3, 4. However, the molecular mechanism of this enhancement remains poorly understood. Here we provide the first quantitative picture of the structure of an ionic liquid adsorbed inside realistically modelled microporous carbon electrodes. We show how the separation of the positive and negative ions occurs inside the porous disordered carbons, yielding much higher capacitance values (125 F g−1) than with simpler electrode geometries5. The proposed mechanism opens the door for the design of materials with improved energy storage capabilities. It also sheds new light on situations where ion adsorption in porous structures or membranes plays a role.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group. The definitive version is available at http://www.nature.com The original PDF of the article can be found at Nature Materials website : http://www.nature.com/nmat/journal/v11/n4/full/nmat3260.html
HAL Id:hal-01153072
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Drexel University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Réseau de stockage électrochimique de l’énergie - Energie RS2E (FRANCE)
Other partners > Ecole supérieure de physique et de chimie industrielles ParisTech - ESPCI (FRANCE)
Other partners > University of Oxford (UNITED KINGDOM)
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Agence Nationale de la Recherche (France)
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Deposited By: cirimat webmestre
Deposited On:19 May 2015 07:39

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