Electrochemical capacitances of well-defined carbon surfaces

Taegon Kim, Seongyop Lim, Kihyun Kwon, Seong Hwa Hong, Wenming Qiao, Choong Kyun Rhee, Seong-Ho Yoon, Isao Mochida

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)

Abstract

Reported is the capacitive behavior of homogeneous and well-defined surfaces of pristine carbon nanofibers (CNFs) and surface-modified CNFs. The capacitances of the well-defined CNFs were measured with cyclic voltammetry to correlate the surface structure with capacitance. Among the studied pristine CNFs, the edge surfaces of platelet CNFs (PCNF) and herringbone CNFs were more effective in capacitive charging than the basal plane surface of tubular CNF by a factor of 3-5. Graphitization of PCNF (GPCNF) changed the edge surface of PCNF into a domelike basal plane surface, and the corresponding capacitances decreased from 12.5 to 3.2 F/g. A chemical oxidation of the GPCNF, however, recovered a clear edge surface by removal of the curved basal planes to increase the capacitance to 5.6 F/g. The difference in the contribution of the edge surface and basal-plane surface to the capacitance of CNF was discussed in terms of the anisotropic conductivity of graphitic materials.

Original languageEnglish
Pages (from-to)9086-9088
Number of pages3
JournalLangmuir
Volume22
Issue number22
DOIs
Publication statusPublished - Oct 24 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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