Correlation between capacitance and porosity in microporous carbon monoliths
Specific 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.
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2014-02-26
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dig-incar-es-10261-988042022-06-27T06:48:13Z Correlation between capacitance and porosity in microporous carbon monoliths Garcia-Gomez, Alejandra Barranco, Violeta Moreno-Fernandez, G. Ibáñez, Joaquín Álvarez Centeno, Teresa Rojo, J. M. Specific 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. Financial support through the projects MAT2011-25198 and MP 1004 is gratefully acknowledged. V.B. thanks MINECO for R&C contract. Peer Reviewed 2014-06-24T08:11:11Z 2014-06-24T08:11:11Z 2014-02-26 2014-06-24T08:11:11Z artículo http://purl.org/coar/resource_type/c_6501 e-issn: 1932-7455 issn: 1932-7447 Journal of Physical Chemistry C 118(10): 5134-5141 (2014) http://hdl.handle.net/10261/98804 10.1021/jp411076a http://dx.doi.org/10.1021/jp411076a open American Chemical Society |
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Specific 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. |
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artículo |
author |
Garcia-Gomez, Alejandra Barranco, Violeta Moreno-Fernandez, G. Ibáñez, Joaquín Álvarez Centeno, Teresa Rojo, J. M. |
spellingShingle |
Garcia-Gomez, Alejandra Barranco, Violeta Moreno-Fernandez, G. Ibáñez, Joaquín Álvarez Centeno, Teresa Rojo, J. M. Correlation between capacitance and porosity in microporous carbon monoliths |
author_facet |
Garcia-Gomez, Alejandra Barranco, Violeta Moreno-Fernandez, G. Ibáñez, Joaquín Álvarez Centeno, Teresa Rojo, J. M. |
author_sort |
Garcia-Gomez, Alejandra |
title |
Correlation between capacitance and porosity in microporous carbon monoliths |
title_short |
Correlation between capacitance and porosity in microporous carbon monoliths |
title_full |
Correlation between capacitance and porosity in microporous carbon monoliths |
title_fullStr |
Correlation between capacitance and porosity in microporous carbon monoliths |
title_full_unstemmed |
Correlation between capacitance and porosity in microporous carbon monoliths |
title_sort |
correlation between capacitance and porosity in microporous carbon monoliths |
publisher |
American Chemical Society |
publishDate |
2014-02-26 |
url |
http://hdl.handle.net/10261/98804 |
work_keys_str_mv |
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1777668933498699776 |