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Rodney S. Ruoff
다차원 탄소재료 연구단
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Capacitance of carbon-based electrical double-layer capacitors Highly Cited Paper

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Title
Capacitance of carbon-based electrical double-layer capacitors
Author(s)
Ji H.; Zhao X.; Qiao Z.; Jung J.; Zhu Y.; Lu Y.; Zhang L.L.; MacDonald A.H.; Rodney S. Ruoff
Publication Date
2014-02
Journal
NATURE COMMUNICATIONS, v.5, no., pp.3317 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical double-layer capacitors. Here we investigate the origin of this behaviour by measuring the electrical double-layer capacitance in one to five-layer graphene. We find that the capacitances are suppressed near neutrality, and are anomalously enhanced for thicknesses below a few layers. We attribute the first effect to quantum capacitance effects near the point of zero charge, and the second to correlations between electrons in the graphene sheet and ions in the electrolyte. The large capacitance values imply gravimetric energy storage densities in the single-layer graphene limit that are comparable to those of batteries. We anticipate that these results shed light on developing new theoretical models in understanding the electrical double-layer capacitance of carbon electrodes, and on opening up new strategies for improving the energy density of carbon-based capacitors. © 2014 Macmillan Publishers Limited. All rights reserved
URI
http://pr.ibs.re.kr/handle/8788114/2417
DOI
10.1038/ncomms4317
ISSN
2041-1723
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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