NiF2 Nanorod Arrays for Supercapattery Applications
2020
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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