Surfactant-free synthesis of a nanoperforated graphene/nitrogen-doped carbon nanotube composite for supercapacitors

Yeon Jun Choi, Hyun Kyung Kim, Suk Woo Lee, Young Hwan Kim, Hee Chang Youn, Kwang Chul Roh, Kwang Bum Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A nanoperforated graphene/carbon nanotube (PG/CNT) composite is fabricated by electrostatic interaction of graphene oxide (GO) and nitrogen-doped CNTs, and subsequent catalytic carbon gasification. The nitrogen-doped sites (pyridinic N sites) of the CNTs are protonated under acidic conditions owing to the lone pair electrons, rendering the CNTs positively charged. The nitrogen-doped CNTs are uniformly incorporated into PG to form the PG/CNT composite through electrostatic attraction between the positively charged CNTs and the negatively charged GO. The resulting PG/nitrogen-doped CNT (N-CNT) composite exhibits outstanding electrochemical properties, showing high specific capacitance (288 F g-1 at 0.5 A g-1) and high rate capability (267 F g-1 at 20 A g-1) as well as excellent cycling stability (99% capacitance retention after 30 000 charge/discharge cycles). This is attributable to not only the formation of a high concentration of edge sites in PG and improvements of cross-plane ion diffusion owing to the nanoperforations, but also the enhancements in the ion-accessible area and in-plane ion diffusion due to the incorporation of N-CNT nanospacers into PG.

Original languageEnglish
Pages (from-to)22607-22617
Number of pages11
JournalJournal of Materials Chemistry A
Volume5
Issue number43
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Carbon Nanotubes
Graphite
Surface-Active Agents
Graphene
Carbon nanotubes
Surface active agents
Nitrogen
Composite materials
Ions
Capacitance
Coulomb interactions
Electrochemical properties
Gasification
Oxides
Electrostatics
Nitric Oxide
Carbon
Supercapacitor
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Choi, Yeon Jun ; Kim, Hyun Kyung ; Lee, Suk Woo ; Kim, Young Hwan ; Youn, Hee Chang ; Roh, Kwang Chul ; Kim, Kwang Bum. / Surfactant-free synthesis of a nanoperforated graphene/nitrogen-doped carbon nanotube composite for supercapacitors. In: Journal of Materials Chemistry A. 2017 ; Vol. 5, No. 43. pp. 22607-22617.
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Surfactant-free synthesis of a nanoperforated graphene/nitrogen-doped carbon nanotube composite for supercapacitors. / Choi, Yeon Jun; Kim, Hyun Kyung; Lee, Suk Woo; Kim, Young Hwan; Youn, Hee Chang; Roh, Kwang Chul; Kim, Kwang Bum.

In: Journal of Materials Chemistry A, Vol. 5, No. 43, 01.01.2017, p. 22607-22617.

Research output: Contribution to journalArticle

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