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Issue 39, 2011
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Graphene and carbon nanotube composite electrodes for supercapacitors with ultra-high energy density

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Abstract

We describe a graphene and single-walled carbon nanotube (SWCNT) composite film prepared by a blending process for use as electrodes in high energy density supercapacitors. Specific capacitances of 290.6 F g−1 and 201.0 F g−1 have been obtained for a single electrode in aqueous and organic electrolytes, respectively, using a more practical two-electrode testing system. In the organic electrolyte the energy density reached 62.8 Wh kg−1 and the power density reached 58.5 kW kg−1. The addition of single-walled carbon nanotubes raised the energy density by 23% and power density by 31% more than the graphene electrodes. The graphene/CNT electrodes exhibited an ultra-high energy density of 155.6 Wh kg−1 in ionic liquid at room temperature. In addition, the specific capacitance increased by 29% after 1000 cycles in ionic liquid, indicating their excellent cyclicity. The SWCNTs acted as a conductive additive, spacer, and binder in the graphene/CNT supercapacitors. This work suggests that our graphene/CNT supercapacitors can be comparable to NiMH batteries in performance and are promising for applications in hybrid vehicles and electric vehicles.

Graphical abstract: Graphene and carbon nanotube composite electrodes for supercapacitors with ultra-high energy density

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Article information


Submitted
12 Jun 2011
Accepted
10 Aug 2011
First published
01 Sep 2011

Phys. Chem. Chem. Phys., 2011,13, 17615-17624
Article type
Paper

Graphene and carbon nanotube composite electrodes for supercapacitors with ultra-high energy density

Q. Cheng, J. Tang, J. Ma, H. Zhang, N. Shinya and L. Qin, Phys. Chem. Chem. Phys., 2011, 13, 17615
DOI: 10.1039/C1CP21910C

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