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Título

Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes

AutorÁlvarez Centeno, Teresa ; Hahn, M.; Fernández López, José Antonio ; Kötz, R.; Stoeckli, F.
Palabras claveSupercapacitor
Double-Layer
Carbon
Porosity
Chemical groups
Fecha de publicación24-ene-2007
EditorElsevier
CitaciónElectrochemistry Communications 9(6): 1242-1246 (2007)
ResumenA study based on a total of 41 nanoporous carbons shows that there exists a good correlation between the limiting gravimetric capacitances Co at low current densities j (1 mA cm−2) measured in aprotic (1 M (C2H5)4 NBF4 in acetonitrile) and in acidic (2 M aqueous H2SO4) electrolytes. The comparison of the surface-related capacitances (F m−2) of well characterized samples with the amount of thermodesorbed CO suggests a strong contribution of CO generating surface groups to charge storage in the acidic electrolyte, but a negligible contribution in the aprotic medium. It also appears that the decrease of the capacitance with current density is similar in both electrolytes. This confirms that the average micropore width and the CO2 generating surface groups are the main factors which limit the ionic mobility in both electrolytes.
Descripción5 pages, 4 figures, 2 tables.-- Printed version published Jun 2007.
Versión del editorhttp://dx.doi.org/10.1016/j.elecom.2007.01.031
URIhttp://hdl.handle.net/10261/11133
DOI10.1016/j.elecom.2007.01.031
ISSN1388-2481
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