Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7728836 | Journal of Power Sources | 2016 | 9 Pages |
Abstract
In this work, we present the synthesis of low cost carbon nanosheets derived from expanded graphite dispersed in Polyvinylpyrrolidone, subsequently activated in KOH and finally carbonized in Ar/H2 atmosphere. Interconnected sheet-like structure with low concentration of oxygen (9.0 at.%) and a specific surface area of 457 m2 gâ1 was obtained. The electrochemical characterization of the carbon material as supercapacitor electrode in a 2-electrode configuration shows high specific capacitance of 337 F gâ1 at a current density of 0.5 A gâ1 as well as high energy density of 37.9 Wh kgâ1 at a power density of 450 W kgâ1. This electrical double layer capacitor electrode also exhibits excellent stability after floating test for 120 h in 6 M KOH aqueous electrolyte. These results suggest that this activated expanded graphite (AEG) material has great potential for high performance electrode in energy storage applications.
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Authors
Farshad Barzegar, Abdulhakeem Bello, Damilola Momodu, Moshawe Jack Madito, Julien Dangbegnon, Ncholu Manyala,