Enhanced electrical capacitance of porous carbons by nitrogen enrichment and control of the pore structure

A series of nitrogen-containing porous carbons were produced through KOH activation of a nitrogen-enriched carbon prepared in the pores of a mesoporous silica. Nitrogen sorption at 77 K showed that the pore volumes increased gradually along with an increasing mass ratio of KOH/carbon. The sample wit...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2009-02, Vol.118 (1), p.28-34
Main Authors: Jiang, Jinhua, Gao, Qiuming, Xia, Kaisheng, Hu, Juan
Format: Article
Language:English
Subjects:
Activation
Chemistry
Colloidal state and disperse state
Electrical capacitance
Exact sciences and technology
General and physical chemistry
Nitrogen-containing carbons
Porous carbon
Porous materials
Surface physical chemistry
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Summary:A series of nitrogen-containing porous carbons were produced through KOH activation of a nitrogen-enriched carbon prepared in the pores of a mesoporous silica. Nitrogen sorption at 77 K showed that the pore volumes increased gradually along with an increasing mass ratio of KOH/carbon. The sample with the highest pore volume of 2.68 ml g −1 was obtained when the mass ratio was 5. Cyclic voltammetry was employed for determination of the electrochemical properties. These samples exhibited a very promising potential as electrode materials for electrical double layer capacitors. An optimized electrical capacitance of 318 F g −1 was obtained in a 6 M KOH electrolyte when the mass ratio KOH/carbon was 3. The effect of the nitrogen content of the samples on the activation behavior and electrochemical properties are discussed in detail.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2008.08.011