Nanographene derived from carbon nanofiber and its application to electric double-layer capacitors

Satoshi Mitani, Marappan Sathish, Dinesh Rangappa, Atsushi Unemoto, Takaaki Tomai, Itaru Homma

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The fascinating properties of graphene are attracting considerable attention in engineering fields such as electronics, optics, and energy engineering. These properties can be controlled by controlling graphene's structure, e.g., the number of layers and the sheet size. In this study, we synthesized nanosized graphene from a platelet-type carbon nanofiber. The thickness and size of nanographene oxide are around 1 nm and 60 nm and we obtained nanographene by hydrazine reduction of nanographene oxide. We applied the nanographene to an ionic-liquid electric double-layer capacitor (EDLC), which exhibited a much larger capacitance per specific surface area than an EDLC using conventional activated carbon. Furthermore, the capacitance increased significantly with increasing cycle time. After 30th cycle, the capacitance was achieved 130 F g -1, though the surface area was only 240 m 2 g -1. These results suggest that nanographene structure induce the capacitance enhancement.

Original languageEnglish
Pages (from-to)146-152
Number of pages7
JournalElectrochimica Acta
Volume68
DOIs
Publication statusPublished - 2012 Apr 30

Keywords

  • Carbon nanofiber
  • EDLC
  • Graphene
  • Ionic liquid

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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