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Fiber-Shaped Supercapacitors Fabricated Using Hierarchical Nanostructures of NiCo2O4 Nanoneedles and MnO2 Nanoflakes on Roughened Ni Wire

Department of Electronic Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Korea
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Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3127; https://doi.org/10.3390/en12163127
Received: 8 June 2019 / Revised: 18 July 2019 / Accepted: 9 August 2019 / Published: 14 August 2019
(This article belongs to the Section Energy Storage and Application)
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Abstract

Electrostatic capacitors have high power density but low energy density. In contrast, batteries and fuel cells have high energy density but low power density. However, supercapacitors can simultaneously achieve both high power density and energy density. Herein, we propose a supercapacitor, in which etched nickel wire was used as a current collector due to its high conductivity. Two redox reactive materials, MnO2 nanoflakes and NiCo2O4 nanoneedles, were used in a hierarchical structure to cover the roughened surface of the Ni wire to maximize the effective surface area. Thus, a specific capacitance, energy density, and power density of 14.4 F/cm3, 2 mWh/cm3, and 0.1 W/cm3, respectively, was obtained via single-electrode experiments. A fiber-shaped supercapacitor was prepared by twisting two electrodes with solid electrolytes made of KOH and polyvinyl alcohol. Although the solid electrolyte had a low ionic conductivity, the energy density and power density were determined to be 0.97 mWh/cm3 and 49.8 mW/cm3, respectively.
Keywords: Fiber-shaped supercapacitors; hierarchical nanostructures; NiCo2O4 nanoneedles; MnO2 nanoflakes; flexible supercapacitor Fiber-shaped supercapacitors; hierarchical nanostructures; NiCo2O4 nanoneedles; MnO2 nanoflakes; flexible supercapacitor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, J.; Shewale, P.S.; Yun, K.-S. Fiber-Shaped Supercapacitors Fabricated Using Hierarchical Nanostructures of NiCo2O4 Nanoneedles and MnO2 Nanoflakes on Roughened Ni Wire. Energies 2019, 12, 3127.

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