TY - JOUR
T1 - Curvature effects in carbon nanomaterials
T2 - Exohedral versus endohedral supercapacitors
AU - Huang, Jingsong
AU - Sumpter, Bobby G.
AU - Meunier, Vincent
AU - Yushin, Gleb
AU - Portet, Cristelle
AU - Gogotsi, Yury
N1 - Funding Information:
We gratefully acknowledge the support from the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL) and from the Center for Nanophase Materials Sciences, sponsored by the Division of Scientific User Facilities, U.S. Department of Energy. G. Yushin was supported by the Air Force Office of Scientific Research, Physics and Electronics Directorate. Y. Gogotsi was supported as part of the Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award No. ERKCC61.
PY - 2010/8
Y1 - 2010/8
N2 - Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.
AB - Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.
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U2 - 10.1557/jmr.2010.0195
DO - 10.1557/jmr.2010.0195
M3 - Article
AN - SCOPUS:77955936396
SN - 0884-2914
VL - 25
SP - 1525
EP - 1531
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 8
ER -