NiF2 Nanorod Arrays for Supercapattery Applications

Nanasaheb M Shinde; Pritamkumar V Shinde; Je Moon Yun; Krishna Chaitanya Gunturu; Rajaram S Mane; Colm O'Dwyer; Kwang Ho Kim

doi:10.1021/acsomega.9b04219

NiF₂ Nanorod Arrays for Supercapattery Applications

ACS Omega. 2020 Mar 11;5(17):9768-9774. doi: 10.1021/acsomega.9b04219. eCollection 2020 May 5.

Authors

Nanasaheb M Shinde¹, Pritamkumar V Shinde², Je Moon Yun², Krishna Chaitanya Gunturu³, Rajaram S Mane⁴, Colm O'Dwyer^{5

6

7

8}, Kwang Ho Kim^{1

2

9}

Affiliations

¹ National Core Research Centre for Hybrid Materials Solution, Pusan National University, 30, Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea.
² Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, 30, Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea.
³ School of Chemical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, India.
⁴ School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, India.
⁵ School of Chemistry, University College Cork, Cork T12 YN60, Ireland.
⁶ Micro-Nano Systems Centre, Tyndall National Institute, Lee Maltings, Cork T12 R5CP, Ireland.
⁷ AMBER@CRANN, Trinity College Dublin, Dublin 2, Ireland.
⁸ Environmental Research Institute, University College Cork, Lee Road, Cork T23 XE10, Ireland.
⁹ School of Materials Science and Engineering, Pusan National University, 30, Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea.

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.