High-performance supercapacitors based on vertically aligned carbon nanotubes and nonaqueous electrolytes

Byungwoo Kim, Haegeun Chung, Woong Kim

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

We demonstrate the high performance of supercapacitors fabricated with vertically aligned carbon nanotubes and nonaqueous electrolytes such as ionic liquids and conventional organic electrolytes. Specific capacitance, maximum power and energy density of the supercapacitor measured in ionic liquid were 75Fg 1, 987kWkg 1 and 27Whkg 1, respectively. The high power performance was consistently indicated by a fast relaxation time constant of 0.2s. In addition, electrochemical oxidation of the carbon nanotubes improved the specific capacitance (158Fg 1) and energy density (53Whkg 1). Both high power and energy density could be attributed to the fast ion transport realized by the alignment of carbon nanotubes and the wide operational voltage defined by the ionic liquid. The demonstrated carbon-nanotube-and nonaqueous-electrolyte-based supercapacitors show great potential for the development of high-performance energy storage devices.

Original languageEnglish
Article number155401
JournalNanotechnology
Volume23
Issue number15
DOIs
Publication statusPublished - 2012 Apr 20

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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