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High performance aqueous asymmetric supercapacitor based on iron oxide anode and cobalt oxide cathode
Journal article   Peer reviewed

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

Rahul Pai and Vibha Kalra
Journal of materials research, v 33(9), pp 1199-1210
14 May 2018
DOI: https://doi.org/10.1557/jmr.2018.13
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Invited Article
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.

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21 citations in Web of Science
21 citations in Scopus

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Web of Science research areas
Materials Science, Multidisciplinary
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