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

Nazifah Islam, Juliusz Warzywoda, Zhaoyang Fan

Research output: Contribution to journalArticlepeer-review

27 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 languageEnglish (US)
Article number9
Pages (from-to)1-8
Number of pages8
JournalNano-Micro Letters
Volume10
Issue number1
DOIs
StatePublished - Jan 2018
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

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