Barzegar, FarshadBello, AbdulhakeemMomodu, Damilola Y.Madito, M.J. (Moshawe)Dangbegnon, Julien K.Manyala, Ncholu I.2016-04-252016-03Barzegar, F, Bello, A, Momodu, D, Madito, MJ, Dangbegnon, J & Manyala, N 2016, 'Preparation and characterization of porous carbon from expanded graphite for high energy density supercapacitor in aqueous electrolyte', Journal of Power Sources, vol. 309, pp. 245-253.0167-4048 (print)1872-6208 (online)10.1016/j.jpowsour.2016.01.097http://hdl.handle.net/2263/52150In 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 atmosphere. Interconnected sheet-like structure with low concentration of oxygen (9.0 at.%) and a specific surface area of 457 m2 g-1 was obtained. The electrochemical characterization of the carbon material as supercapacitor electrode in a 2-electrode configuration shows high specific capacitance of 337 F g-1 at a current density of 0.5 A g-1 as well as high energy density of 37.9 Wh kg-1 at a power density of 450 W kg-1.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.en© 2016 Published by Elsevier B.V. All rights reserved.Notice : this is the author’s version of a work that was accepted for publication in Computers and Security. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Computers and Security, vol. 309, pp. 245-253, 2016. doi :10.1016/j.jpowsour.2016.01.097.Porous carbonSupercapacitorEnergy storageActivated carbon nanosheetsPostprint Article