Improvement of electrochemical characteristics by changing morphologies of carbon electrode

Hyung Seob Min, Sangsig Kim, Deock Soo Cheong, Won Kook Choi, Young Jei Oh, Jeon Kook Lee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Activated carbon (AC) with very large surface area has high capacitance per weight. However, such activation methods tend to suffer from low yields, below 50%, and are low in electrode density and capacitance per volume. Carbon NanoFibers (CNFs) had high surface area polarizability, high electrical conductivity and chemical stability, as well as extremely high mechanical strength and modulus, which make them an important material for electrochemical capacitors. The electrochemical properties of immobilized CNF electrodes were studied for use as in electrical double layer capacitor (EDLC) applications. Immobilized CNFs on Ni foam grown by thermal chemical vapor deposition (CVD) were successfully fabricated. CNFs had a uniform diameter range from 50 to 60 nm. Surface area was 56 m2/g. CNF electrodes were compared with AC and multi wall carbon nanotube (MWNT) electrodes. The electrochemical performance of the various electrodes was examined with aqueous electrolyte of 2M KOH. Equivalent series resistance (ESR) of the CNF electrodes was lower than that of AC and MWNT electrodes. The specific capacitance of 47.5 F/g of the CNF electrodes was achieved with discharge current density of 1 mA/cm2.

Original languageEnglish
Pages (from-to)544-549
Number of pages6
JournalKorean Journal of Materials Research
Volume19
Issue number10
DOIs
Publication statusPublished - 2009 Oct

Keywords

  • Carbon nanofiber
  • EDLC (electric double layer capacitor)
  • Equivalent series resistance
  • KOH electrolyte
  • Raman

ASJC Scopus subject areas

  • Materials Science(all)

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