Electrochemical performance of a coaxial fiber-shaped asymmetric supercapacitor based on nanostructured MnO^sub 2^/CNT-web paper and Fe^sub 2^O^sub 3^/carbon fiber electrodes

The fiber-shaped supercapacitor is a promising energy storage device in wearable and portable electronics because of its high flexibility, small size, and light weight. However, most of the reported fiber-shaped supercapacitors have exhibited low capacitance and energy density due to the limited sur...

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Bibliographic Details
Published in:Carbon (New York) 2018-08, Vol.134, p.366
Main Authors: Patil, Bebi, Ahn, Suhyun, Yu, Seongil, Song, Hyeonjun, Jeong, Youngjin, Kim, Ju Hwan, Ahn, Heejoon
Format: Article
Language:English
Subjects:
Asymmetry
Capacitance
Carbon
Carbon fibers
Component parts
Computer storage devices
Electric potential
Electrochemical analysis
Electrodes
Energy storage
Fibers
Flexibility
Flux density
Hematite
Iron oxides
Manganese dioxide
Nanostructured materials
Portable equipment
Supercapacitors
Wearable technology
Webs
Weight reduction
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Summary:The fiber-shaped supercapacitor is a promising energy storage device in wearable and portable electronics because of its high flexibility, small size, and light weight. However, most of the reported fiber-shaped supercapacitors have exhibited low capacitance and energy density due to the limited surface area between the two fiber electrodes and operating voltage range. Herein, we successfully developed a coaxial fiber-shaped asymmetric supercapacitor (CFASC) made from MnO2/CNT-web paper as a cathode coupled with Fe2O3/carbon fiber as an anode with a high operating voltage of 2.2 V. The prepared CFASC device showed a high volumetric energy density of 0.43 mWh cm−3 at a power density of 0.02 W cm−3, which is comparable to those of previously reported fiber-shaped supercapacitors. Additionally, CFASC exhibited good rate capability, long cycle life, and high volumetric capacitance (0.67 F cm−3) with excellent flexibility. The promising performance of CFASC illustrated its potential for portable and wearable energy storage devices.
ISSN:0008-6223
1873-3891