Journal article
Microelectrode study of pore size, ion size, and solvent effects on the charge/discharge behavior of microporous carbons for electrical double-layer capacitors
Journal of The Electrochemical Society (JES), v 156(1), pp A7-A12
30 Oct 2008
Featured in Collection : UN Sustainable Development Goals @ Drexel
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.
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Details
- Title
- Microelectrode study of pore size, ion size, and solvent effects on the charge/discharge behavior of microporous carbons for electrical double-layer capacitors
- Creators
- Rongying LinPierre-Louis TabernaJohn ChmiolaDaniel GuayYury GogotsiPatrice Simon
- Publication Details
- Journal of The Electrochemical Society (JES), v 156(1), pp A7-A12
- Publisher
- Electrochemical Society
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000261209800002
- Scopus ID
- 2-s2.0-56749168849
- Other Identifier
- 991014969865804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Electrochemistry
- Materials Science, Coatings & Films