Journal
JOURNAL OF POWER SOURCES
Volume 273, Issue -, Pages 305-311Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.09.094
Keywords
Graphene foam; Polyvinyl alcohol; Formaldehyde; KOH activation; Asymmetric supercapacitor
Funding
- South African Research Chairs Initiative (SARChi) in carbon Technology and Matarials of the Department of Science and Technology (DST)
- National Research Foundation (NRF)
- University of Pretoria
- NRF
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We 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. (C) 2014 Elsevier B.V. All rights reserved.
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