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Issue 46, 2014
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Full capacitance potential of SWCNT electrode in ionic liquids at 4 V

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Abstract

We studied the full capacitance potential of single-walled carbon nanotube (SWCNT, 1250 m2 g−1) in EMIBF4 at 4 V by a new charge mode with certain dwelling time at 4 V. This allowed the accessible surface area of SWCNT, in monodispersed state and with macropores in large amount, to be fully explored to exhibit capacitance of 16 μF cm−2 in a wide range of current density, which is higher than that (9.1 μF cm−2) of graphene (5 μm in size and 2200 m2 g−1). In situ Raman characterization upon charge and discharge validated the enhanced doping of ions of EMIBF4 on SWCNT wall with the increased potential. The energy density is found to be 107 W h kg−1 at the power density of 20 kW kg−1, far exceeding that (64 W h kg−1) in conventional galvanostatic charge and discharge mode.

Graphical abstract: Full capacitance potential of SWCNT electrode in ionic liquids at 4 V

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Article information


Submitted
12 Sep 2014
Accepted
09 Oct 2014
First published
09 Oct 2014

J. Mater. Chem. A, 2014,2, 19897-19902
Article type
Paper
Author version available

Full capacitance potential of SWCNT electrode in ionic liquids at 4 V

Y. Yu, C. Cui, W. Qian and F. Wei, J. Mater. Chem. A, 2014, 2, 19897
DOI: 10.1039/C4TA04773G

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