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NiF2 Nanorod Arrays for Supercapattery Applications
journal contribution
posted on 2020-03-11, 12:14 authored by Nanasaheb
M. Shinde, Pritamkumar V. Shinde, Je Moon Yun, Krishna Chaitanya Gunturu, Rajaram S. Mane, Colm O’Dwyer, Kwang Ho KimA 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.