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Nano-Flower MnO2 Coated Graphene Composite Electrodes for Energy Storage Devices

Published online by Cambridge University Press:  03 March 2011

Qian Cheng ,
Jie Tang ,
Jun Ma ,
Han Zhang ,
Norio Shinya  and
Lu-Chang Qin
Qian Cheng
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan Doctoral Program in Materials Science and Engineering, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8577, Japan
Jie Tang
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan Doctoral Program in Materials Science and Engineering, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8577, Japan
Jun Ma
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Han Zhang
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Norio Shinya
Affiliation:
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan
Lu-Chang Qin
Affiliation:
Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
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Abstract

Graphene, two-dimensional layers of sp2-bonded carbon, has many unique properties. In this paper, graphene is decorated with flower-like MnO2 nanostructures for the application in energy storage devices. The as-prepared graphene and MnO2 nano-flowers, which were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), were assembled into an asymmetric supercapacitor. The specific capacitance of the graphene electrode reached 245 F/g at a charging current of 1 mA. The MnO2 nano-flowers which consisted of tiny rods with a diameter of less than 10 nm were coated onto the graphene electrodes by electrodeposition. The specific capacitance after the MnO2 deposition is 328 F/g at the charging current of 1 mA with an energy density of 11.4Wh/kg and power density of 25.8 kW/kg. This work suggests that our graphene-based electrodes can be a promising candidate for high-performance energy storage devices.

Keywords

electrodepositionenergy storageC
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1303: Symposium Y – Nanomaterials Integration for Electronics, Energy and Sensing , 2011 , mrsf10-1303-y14-04
Copyright
Copyright © Materials Research Society 2011

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References

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