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High performance aqueous asymmetric supercapacitor based on iron oxide anode and cobalt oxide cathode

Published online by Cambridge University Press:  21 February 2018

Rahul Pai
Affiliation:
Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
Vibha Kalra*
Affiliation:
Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We develop an asymmetric aqueous supercapacitor using iron oxide anode and cobalt oxide cathode. The anode was fabricated using electrospinning of carbon precursor/iron oxide precursor blend followed by pyrolysis and in situ electrochemical conversion (to oxide) to form the binder-free and freestanding composite anode which delivered a capacitance of 460 F/g at 1 A/g and retained 82% capacitance after 5000 cycles. The superior performance is attributed to easy electrolyte accessibility as well as the porous fibrous carbon morphology, facilitating volume expansion of iron oxide. The cobalt oxide cathode was prepared using a simple chemical synthesis technique. The electrodes were chosen based on high over potential to water splitting reactions in 6 M KOH electrolyte resulting in a potential window of 1.6 V. The asymmetric device operated in 1.6 V achieved a capacitance of 94.5 F/g at 0.5 A/g while retaining 75% of its capacitance after 12,000 cycles, delivering energy and power densities of 40.53 W h/kg and 2432 W/kg, respectively.

Type
Invited Article
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Tianyu Liu

References

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