Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 10, Pages 5134-5141Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp411076a
Keywords
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Funding
- MINECO
- [MAT2011-25198]
- [MP 1004]
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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.
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