Effect of nitrogen in carbon electrode on the supercapacitor performance

Porous carbons enriched in nitrogen (from 1.9 to 7.2 wt%) substituted for carbon in the network have been tested for supercapacitor application. Voltammetry, galvanostatic and impedance spectroscopy measurements clearly show a beneficial effect of nitrogen on the capacitance behavior in acidic and o...

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Bibliographic Details
Published in:Chemical physics letters 2005-03, Vol.404 (1), p.53-58
Main Authors: Lota, G., Grzyb, B., Machnikowska, H., Machnikowski, J., Frackowiak, E.
Format: Article
Language:English
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Summary:Porous carbons enriched in nitrogen (from 1.9 to 7.2 wt%) substituted for carbon in the network have been tested for supercapacitor application. Voltammetry, galvanostatic and impedance spectroscopy measurements clearly show a beneficial effect of nitrogen on the capacitance behavior in acidic and organic medium. For a series of carbons with similar microtextural characteristics ( S BET about 800 m 2/g, micropore fraction 0.84–0.93) a perfect correlation of specific capacitance and nitrogen content is reported, especially, for acidic electrolyte. The enhancement of surface area to 1400 m 2/g with a moderate nitrogen content (2.6 wt%) leads to a superior capacitance behavior.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2005.01.074