NiF2 nanorod arrays for supercapattery applications

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Supporting Information
Date
2020-03-11
Authors
Shinde, N. M.
Shinde, P. V.
Yun, J. M.
Gunturu, K. C.
Mane, R. S.
O'Dwyer, Colm
Kim, K. H.
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American Chemical Society
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Abstract
A electrode for energy storage cells is possible directly on Ni foam, using a simple reduction process to form NiF2 nanorod arrays (NA). We demonstrate NiF2@Ni NA for a symmetric electrochemical supercapattery electrode. With an areal specific capacitance of 51 F cm–2 at 0.25 mA cm–2 current density and 94% cycling stability, a NiF2@Ni electrode can exhibit supercapattery behavior, a combination of supercapacitor and battery-like redox. The symmetric electrochemical supercapattery delivers 31 W h m–2 energy density and 797 W m–2 power density with 83% retention in a 1 M KOH electrolyte, constituting a step toward manufacturing a laboratory-scale energy storage device based on metal halides. Producing self-grown hierarchically porous nanostructured electrodes on three-dimensional metal foams by displacement reactions may be useful for other metal halides as electrodes for supercapacitors, supercapatteries, and lithium-ion batteries.
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Keywords
Redox reactions , Electrical properties , Electrodes , Nanorods , Materials
Citation
Shinde, N. M., Shinde, P. V., Yun, J. M., Gunturu K. C., Mane R. S., O'Dwyer, C., Kim K. H. (2020) 'NiF2 Nanorod Arrays for Supercapattery Applications', ACS Omega, 5 (17), pp. 9768-9774. doi: 10.1021/acsomega.9b04219