High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors

Wu, Zhong-Shuai, Ren, Wencai, Wang, Da-Wei, Li, Feng, Liu, Bilu and Cheng, Hui-Ming (2010) High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors. ACS Nano, 4 10: 5835-5842. doi:10.1021/nn101754k

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Author Wu, Zhong-Shuai
Ren, Wencai
Wang, Da-Wei
Li, Feng
Liu, Bilu
Cheng, Hui-Ming
Title High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors
Formatted title
High-energy MnO2 nanowire/graphene and graphene asymmetric electrochemical capacitors
Journal name ACS Nano   Check publisher's open access policy
ISSN 1936-0851
Publication date 2010-10-01
Sub-type Article (original research)
DOI 10.1021/nn101754k
Open Access Status DOI
Volume 4
Issue 10
Start page 5835
End page 5842
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
In order to achieve high energy and power densities, we developed a high-voltage asymmetric electrochemical capacitor (EC) based on graphene as negative electrode and a MnO2 nanowire/graphene composite (MGC) as positive electrode in a neutral aqueous Na2SO4 solution as electrolyte. MGC was prepared by solution-phase assembly of graphene sheets and α-MnO2 nanowires. Such aqueous electrolyte-based asymmetric ECs can be cycled reversibly in the high-voltage region of 0-2.0 V and exhibit a superior energy density of 30.4 Wh kg-1, which is much higher than those of symmetric ECs based on graphene//graphene (2.8 Wh kg-1) and MGC//MGC (5.2 Wh kg-1). Moreover, they present a high power density (5000 W kg-1 at 7.0 Wh kg-1) and acceptable cycling performance of ∼79% retention after 1000 cycles. These findings open up the possibility of graphene-based composites for applications in safe aqueous electrolyte-based high-voltage asymmetric ECs with high energy and power densities. © 2010 American Chemical Society.
Keyword Graphene
Manganese oxide
Electrochemical capacitor
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
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Created: Fri, 11 Mar 2011, 20:57:25 EST by Celestien Warnaar-Notschaele on behalf of Aust Institute for Bioengineering & Nanotechnology