NiF 2 Nanorod Arrays for Supercapattery Applications

作者：Nanasaheb M. Shinde, Pritamkumar V. Shinde, Je Moon Yun, Krishna Chaitanya Gunturu, Rajaram S. Mane, Colm O’Dwyer, Kwang Ho Kim · 发表于：ACS Omega · 年份：2020 · DOI：10.1021/acsomega.9b04219 · 被引用次数：31 · 研究领域：Supercapacitor Materials and Fabrication、Advanced battery technologies research、Advancements in Battery Materials

High Resolution Image Download MS PowerPoint Slide A electrode for energy storage cells is possible directly on Ni foam, using a simple reduction process to form NiF 2 nanorod arrays (NA). We demonstrate NiF 2 @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 NiF 2 @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.