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2015 ; 5
(ä): 15551
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Significant Performance Enhancement in Asymmetric Supercapacitors based on Metal
Oxides, Carbon nanotubes and Neutral Aqueous Electrolyte
#MMPMID26494197
Singh A
; Chandra A
Sci Rep
2015[Oct]; 5
(ä): 15551
PMID26494197
show ga
Amongst the materials being investigated for supercapacitor electrodes, carbon
based materials are most investigated. However, pure carbon materials suffer from
inherent physical processes which limit the maximum specific energy and power
that can be achieved in an energy storage device. Therefore, use of carbon-based
composites with suitable nano-materials is attaining prominence. The synergistic
effect between the pseudocapacitive nanomaterials (high specific energy) and
carbon (high specific power) is expected to deliver the desired improvements. We
report the fabrication of high capacitance asymmetric supercapacitor based on
electrodes of composites of SnO2 and V2O5 with multiwall carbon nanotubes and
neutral 0.5 M Li2SO4 aqueous electrolyte. The advantages of the fabricated
asymmetric supercapacitors are compared with the results published in the
literature. The widened operating voltage window is due to the higher
over-potential of electrolyte decomposition and a large difference in the work
functions of the used metal oxides. The charge balanced device returns the
specific capacitance of ~198 F g(-1) with corresponding specific energy of ~89 Wh
kg(-1) at 1 A g(-1). The proposed composite systems have shown great potential in
fabricating high performance supercapacitors.