TY - JOUR
T1 - 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
AU - Ishii, Takafumi
AU - Kaburagi, Yutaka
AU - Yoshida, Akira
AU - Hishiyama, Yoshihiro
AU - Oka, Hideaki
AU - Setoyama, Norihiko
AU - Ozaki, Jun ichi
AU - Kyotani, Takashi
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/12
Y1 - 2017/12
N2 - 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.
AB - 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.
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U2 - 10.1016/j.carbon.2017.09.049
DO - 10.1016/j.carbon.2017.09.049
M3 - Article
AN - SCOPUS:85029584552
VL - 125
SP - 146
EP - 155
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -