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NiF₂ Nanorod Arrays for Supercapattery Applications.

Nanasaheb M Shinde¹, Pritamkumar V Shinde², Je Moon Yun²

¹National Core Research Centre for Hybrid Materials Solution, Pusan National University, 30, Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea.

|May 12, 2020

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Researchers developed a novel nickel-fluoride nanorod array electrode on nickel foam for high-performance supercapatteries. This electrode offers excellent energy density and stability, advancing metal halide energy storage solutions.

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Developing advanced electrode materials is crucial for next-generation energy storage devices.
Metal halides offer potential for electrochemical energy storage due to their unique redox properties.

Purpose of the Study:

To fabricate and characterize a novel nickel-fluoride nanorod array (NiF2@Ni NA) electrode on nickel foam.
To evaluate the performance of the NiF2@Ni NA as a symmetric electrode for supercapatteries.

Main Methods:

Direct reduction process on nickel foam to form NiF2 nanorod arrays.
Fabrication of a symmetric electrochemical supercapattery using the NiF2@Ni NA electrode.
Electrochemical testing including capacitance, cycling stability, energy density, and power density measurements.

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Main Results:

Achieved an areal specific capacitance of 51 F cm-2 at 0.25 mA cm-2.
Demonstrated 94% cycling stability, indicating robust performance.
Delivered an energy density of 31 Wh m-2 and a power density of 797 W m-2 with 83% retention in 1 M KOH electrolyte.

Conclusions:

The NiF2@Ni NA electrode exhibits promising supercapattery behavior, combining supercapacitor and battery-like redox properties.
This metal halide-based electrode represents a significant step towards laboratory-scale energy storage devices.
The fabrication method using displacement reactions on 3D metal foams could be applicable to other metal halides for various energy storage applications.