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Microelectrode study of pore size, ion size, and solvent effects on the charge/discharge behavior of microporous carbons for electrical double-layer capacitors

Lin, Rongying and Taberna, Pierre-Louis and Chmiola, John and Guay, Daniel and Gogotsi, Yury and Simon, Patrice Microelectrode study of pore size, ion size, and solvent effects on the charge/discharge behavior of microporous carbons for electrical double-layer capacitors. (2008) Journal of The Electrochemical Society (JES), vol. 156 (n° 1). A7-A12. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.3002376

Abstract

The capacitive behavior of TiC-derived carbon powders in two different electrolytes, NEt4BF4 in acetonitrile AN and NEt4BF4 in propylene carbonate PC, was studied using the cavity microelectrode CME technique. Comparisons of the cyclic voltammograms recorded at 10–1000 mV/s enabled correlation between adsorbed ion sizes and pore sizes, which is important for understanding the electrochemical capacitive behavior of carbon electrodes for electrical double-layer capacitor applications. The CME technique also allows a fast selection of carbon electrodes with matching pore sizes different sizes are needed for the negative and positive electrodes for the respective electrolyte system. Comparison of electrochemical capacitive behavior of the same salt, NEt4BF4, in different solvents, PC and AN, has shown that different pore sizes are required for different solvents, because only partial desolvation of ions occurs during the double-layer charging. Squeezing partially solvated ions into subnanometer pores, which are close to the desolvated ion size, may lead to distortion of the shape of cyclic voltammograms.

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://www.electrochem.org/ The original PDF of the article can be found at Journal of The Electrochemical Society (JES) website : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JESOAN0001560000010000A7000001&idtype=cvips&gifs=yes
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Drexel University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Institut National de la Recherche Scientifique - INRS (CANADA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Nihad Lahdifi
Deposited On:13 Jan 2011 14:14

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