Journal
MATERIALS RESEARCH EXPRESS
Volume 6, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab1a24
Keywords
asymmetric electrochemical capacitors; manganese oxide; carbon nanotubes; electrostatic spray deposition; activated carbon
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Funding
- National Science Foundation (NSF) [1506640, 1509735]
- NSF
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In this study, three binder-free manganese oxide-carbon nanotube (MnOx-CNT) composite films were synthesized using electrostatic spray deposition (ESD) and evaluated as electrochemical capacitor (EC) electrodes in aqueous media. The MnOx-CNT 9-1 composition exhibited superior electrochemical performance as compared to both the pristine MnOx and MnOx-CNT 8-2 composite films, exhibiting a high specific capacitance of 281 F g(-1) in addition to excellent rate handling and cyclability. In order to investigate the practical viability of the MnOx-CNT 9-1 electrodes, a comprehensive two-electrode analysis was performed using activated carbon (AC) counter electrodes for different mass ratios to obtain optimal energy-power trade-off. The asymmetric capacitor with the AC electrode with a mass 2.6 times that of the MnOx-CNT 9-1 electrode exhibited the best energy-power characteristics reaching a maximal gravimetric energy density of 30.3 Wh kg(-1); the excellent electrochemical performance of the asymmetric capacitor is attributed to the wider cell voltage of 2V as well as the high gravimetric capacitance of the ESD-based MnOx-CNT composite cathode.
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