Analyses of trace amounts of edge sites in natural graphite, synthetic graphite and high-temperature treated coke for the understanding of their carbon molecular structures

Takafumi Ishii, Yutaka Kaburagi, Akira Yoshida, Yoshihiro Hishiyama, Hideaki Oka, Norihiko Setoyama, Jun ichi Ozaki, Takashi Kyotani

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Trace amounts of edge sites in natural graphite, synthetic graphite and high-temperature treated coke are quantitatively analyzed from the numbers of hydrogen atoms and oxygen-containing functional groups at carbon edge sites. For the analysis of hydrogen content, a new analytical technique is developed. The oxygen-containing functional groups are analyzed with a highly sensitive temperature-programmed desorption (TPD) technique. These techniques allow us to estimate the trace amounts of edge sites in the range of 1–10 × 10−4 at.% with extremely high accuracy and reveal that the concentration and the type of edges sites differ depending on the type and the particle size of these graphitized carbons. Moreover, the average sizes of graphene sheets in these carbons are estimated from the total number of edge sites. The graphene sheet size thus obtained is compared with the crystallite sizes, La, and the average particle size, and such comparison provides deep insight into the understanding of carbon molecular structure in the graphitized carbons.

Original languageEnglish
Pages (from-to)146-155
Number of pages10
JournalCarbon
Volume125
DOIs
Publication statusPublished - 2017 Dec

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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