Effects of microporosity on the specific capacitance of polyacrylonitrile-based activated carbon fiber

Jong Gyu Lee, Je Young Kim, Sung Hyun Kim

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Polyacrylonitrile (PAN)-based, microporous activated carbon fibers (ACFs) were investigated as electrode materials for electrochemical capacitors in KOH electrolyte solutions. PAN-ACFs were analyzed by using nitrogen adsorption data and the Dubinin-Raduskevich equation. The pore size distributions were narrow. As the micropore volume increased, the average micropore diameter decreased. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge-discharge profile analysis were used to investigate the penetrability of electrolyte ions into the carbon electrodes. The electrolyte ions in the carbon electrode with a large micropore diameter could be accessible easily even if the pore size distribution is narrow. However, the specific capacitance decreased in spite of the increase of the micropore volume.

Original languageEnglish
Pages (from-to)1495-1500
Number of pages6
JournalJournal of Power Sources
Volume160
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct 6

Keywords

  • Impedance spectroscopy
  • Micropore
  • PAN-ACF
  • Specific capacitance
  • Tension

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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