Effects of oxidation and heat treatment of acetylene blacks on their electrochemical double layer capacitances

Taegon Kim, Chulho Ham, Choong Kyun Rhee, Seong Ho Yoon, Masaharu Tsuji, Isao Mochida

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Correlations between the electrochemical double layer capacitances of various acetylene blacks modified by surface oxidation and heat treatment, and their morphologies are presented. The acetylene blacks were different from each other in primary structural unit size (equivalent to mean particle diameter). They were oxidized in air at 300 °C for 1 h to produce graphene sheets protruding from the surfaces of the spherical particles. In addition, the surfaces of the acetylene blacks were modified by heat treatments from 1000 °C to 2800 °C, which resulted in a morphological change from surfaces covered with protruding graphene sheets to ones wrapped with basal planes of graphite. Correlations between the capacitances of the acetylene blacks and the observed morphologies showed that the surface covered with protruding graphene sheets was roughly 10 times more effective in capacitive charging than the surface of graphite basal planes. Specifically, the surface specific capacitance of the edged-graphene-sheet-covering surface was 146 mF/m2, while that of the basal-planes-wrapping surface was 16 mF/m2. It was concluded that the capacitances of the acetylene blacks were mainly defined by surface morphology, which were in turn influenced by structural unit size and degree of oxidation.

Original languageEnglish
Pages (from-to)226-233
Number of pages8
JournalCarbon
Volume47
Issue number1
DOIs
Publication statusPublished - Jan 1 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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