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Correlation between capacitance and porosity in microporous carbon monoliths

AuthorsGarcía-Gómez, A.; Barranco, Violeta ; Moreno-Fernandez, G.; Ibáñez, Joaquín; Álvarez Centeno, Teresa ; Rojo, J. M.
Issue Date26-Feb-2014
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 118(10): 5134-5141 (2014)
AbstractSpecific capacitance of carbons in aqueous KOH electrolyte seems to have two contributions, a double-layer capacitance and a pseudocapacitance. Moreover, the specific capacitance increases as the specific surface area does. Here, we report that the pseudocapacitance is associated with the K+ ion and the double-layer capacitance with both K+ and OH- ions. The former ion dominates the capacitance of a real two-electrode supercapacitor. Two microporous carbon monoliths with surface areas similar for micropores below 0.63 nm but different for larger micropores are chosen. There is a correlation between the double-layer capacitance due to those ions and the surface areas due to micropores with sizes above a certain value. It provides information on the size of those ions as they are electroadsorbed at the double layer. The dielectric permittivity associated with the K+ and OH - ion is discussed in relation to the confinement of these electroadsorbed ions in the micropores. © 2014 American Chemical Society.
Publisher version (URL)http://dx.doi.org/10.1021/jp411076a
Identifierse-issn: 1932-7455
issn: 1932-7447
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