Edge-oriented graphene on carbon nanofiber for high-frequency supercapacitors

Nazifah Islam; Juliusz Warzywoda; Zhaoyang Fan

doi:10.1007/s40820-017-0162-4

Edge-oriented graphene on carbon nanofiber for high-frequency supercapacitors

Nazifah Islam, Juliusz Warzywoda, Zhaoyang Fan

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

High-frequency supercapacitors are being stud-ied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3D edge-oriented graphene (EOG) was grown encircling carbon nanofiber (CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at-45° phase angle was found to be as high as 22 and 8.5 kHz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 mF cm^-2 for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promising potential of this technology for compact power supply design and other applications.

Original language	English
Article number	9
Pages (from-to)	1-8
Number of pages	8
Journal	Nano-Micro Letters
Volume	10
Issue number	1
DOIs	https://doi.org/10.1007/s40820-017-0162-4
State	Published - Jan 2018

Keywords

AC filtering
Carbon nanofiber
High-frequency supercapacitor
Kilohertz supercapacitor
Vertical graphene

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10.1007/s40820-017-0162-4

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abstract = "High-frequency supercapacitors are being stud-ied with the aim to replace the bulky electrolytic capacitors for current ripple filtering and other functions used in power systems. Here, 3D edge-oriented graphene (EOG) was grown encircling carbon nanofiber (CNF) framework to form a highly conductive electrode with a large surface area. Such EOG/CNF electrodes were tested in aqueous and organic electrolytes for high-frequency supercapacitor development. For the aqueous and the organic cell, the characteristic frequency at-45° phase angle was found to be as high as 22 and 8.5 kHz, respectively. At 120 Hz, the electrode capacitance density was 0.37 and 0.16 mF cm-2 for the two cells. In particular, the 3 V high-frequency organic cell was successfully tested as filtering capacitor used in AC/DC converter, suggesting the promising potential of this technology for compact power supply design and other applications.",

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Edge-oriented graphene on carbon nanofiber for high-frequency supercapacitors

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Keywords

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