Bello, AbdulhakeemBarzegar, FarshadMomodu, Damilola Y.Dangbegnon, Julien K.Taghizadeh, FatemehFabiane, MopeliManyala, Ncholu I.2014-11-102014-11-102015-01Bello, A, Barzegar, F, Momodu, Damilola, Dangbegnon, J, Taghizadeh, F, Fabiane, M & Manyala, N 2015, 'Asymmetric supercapacitor based on nanostructured graphene foam/polyvinyl alcohol/formaldehyde and activated carbon electrodes', Journal of Power Sources, vol. 273, pp. 305-311.10.1016/j.jpowsour.2014.09.0940378-7753 (print)1873-2755 (online)http://hdl.handle.net/2263/42550We present the electrochemical results of highly porous and interconnected carbon material by activation of graphene foam/polyvinyl alcohol-formaldehyde composite material designated as GF/PVA-F. Asymmetric supercapacitor devices were fabricated using the activated material (GF/PVA-F) and activated carbon (AC) as the positive and negative electrodes respectively. The device exhibited a maximum energy density of 42 mWh cm 2, a power density of 0.5 W cm 2 and 98% retention of its initial capacitance after 2000 cycles in an extended cell potential window of 1.8 V in 1 M Na2SO4 aqueous electrolyte. This work shows the great potential of this material for high performance energy storage application.en© 2014 Elsevier B.V.All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Power Sources. 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 Journal of Power Sources, vol. 273, pp. 305-311, 2015. doi : 10.1016/j.jpowsour.2014.09.094.Graphene foamPolyvinyl alcoholFormaldehydeKOH activationAsymmetric supercapacitorPostprint Article