Graphitic carbon nanofibers synthesized by the chemical vapor deposition (CVD) method and their electrochemical performances in supercapacitors

Hulicova-Jurcakova, Denisa, Li, Xiang, Zhu, Zhonghua, de Marco, Roland and Lu, Gao Qing (2008) Graphitic carbon nanofibers synthesized by the chemical vapor deposition (CVD) method and their electrochemical performances in supercapacitors. Energy & Fuels, 22 6: 4139-4145. doi:10.1021/ef8004306


Author Hulicova-Jurcakova, Denisa
Li, Xiang
Zhu, Zhonghua
de Marco, Roland
Lu, Gao Qing
Title Graphitic carbon nanofibers synthesized by the chemical vapor deposition (CVD) method and their electrochemical performances in supercapacitors
Journal name Energy & Fuels   Check publisher's open access policy
ISSN 0887-0624
1520-5029
Publication date 2008-11-19
Year available 2008
Sub-type Article (original research)
DOI 10.1021/ef8004306
Open Access Status Not yet assessed
Volume 22
Issue 6
Start page 4139
End page 4145
Total pages 7
Editor M. T. Klein
Place of publication Washington, D.C., U. S. A.
Publisher American Chemical Society
Language eng
Subject 100708 Nanomaterials
850602 Energy Storage (excl. Hydrogen)
C1
0904 Chemical Engineering
Abstract Graphitic carbon nanofibers were synthesized by chemical vapor deposition of methane and acetylene on the gamma-alumina-supported nickel catalyst. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption/desorption, X-ray diffraction (XRD), and Raman spectroscopy were used to examine the structure and the graphitic degree of carbons. The results show that carbons derived from methane consist of a more graphitic structure compared to acetylene-based carbons. The temperature and the catalyst loading affected the graphitic structure further; i.e., the higher the temperature and the catalyst loadings, the better the graphitic structure. The electrochemical performance of synthesized carbons in 1 M H(2)SO(4) revealed that the methane-based carbons show very stable charge/discharge performance in the whole range of investigated current loadings (viz., 0.05 and 3 A g(-1)), owing to the graphitic structure and thus resulting from the good charge propagation, particularly at high loads. On the other hand, acetylene-based carbons provide greater gravimetric capacitance values as a result of structural defects, but consequently, the capacitance drops at high current loads.
Formatted abstract
Graphitic carbon nanofibers were synthesized by chemical vapor deposition of methane and acetylene on the γ-alumina-supported nickel catalyst. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption/desorption, X-ray diffraction (XRD), and Raman spectroscopy were used to examine the structure and the graphitic degree of carbons. The results show that carbons derived from methane consist of a more graphitic structure compared to acetylene-based carbons. The temperature and the catalyst loading affected the graphitic structure further; i.e., the higher the temperature and the catalyst loadings, the better the graphitic structure. The electrochemical performance of synthesized carbons in 1 M H2SO4 revealed that the methane-based carbons show very stable charge/discharge performance in the whole range of investigated current loadings (viz., 0.05 and 3 A g-1), owing to the graphitic structure and thus resulting from the good charge propagation, particularly at high loads. On the other hand, acetylene-based carbons provide greater gravimetric capacitance values as a result of structural defects, but consequently, the capacitance drops at high current loads.
© 2008 American Chemical Society
Keyword Temperature methane decomposition
Moderate temperatures
Filamentous carbon
Ni catalysts
Growth
Nanotubes
Morphology
Conversion
Hydrogen
Ni/Sio2
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 16 Apr 2009, 20:59:28 EST by Amanda Lee on behalf of School of Chemical Engineering