Journal
NANO ENERGY
Volume 2, Issue 3, Pages 403-411Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2012.11.006
Keywords
Electrochemical capacitors; Activated graphene; Ionic liquid mixture; Wide temperature range
Categories
Funding
- European Research Council [ERC-2011-AdG, 291543 - IONACES]
- ERC
- Fluid Interface Reactions, Structures and Transport (FIRST) Center, an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences
- US Department of Energy (DOE) [DE-SC001951]
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High specific surface area (SSA similar to 2000 m(2)/g) porous KOH-activated microwave exfoliated graphite oxide ('a-MEGO') electrodes have been tested in a eutectic mixture of ionic liquids (1:1 by weight or molar ratio N-methyl-N-propylpiperidinium bis(fluorosulfonyl)imide (PIP13-FSI) and N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (PYR14-FSI)) as electrolyte for supercapacitor applications. By optimizing the carbon/electrolyte system, outstanding capacitive performance has been achieved with high capacitance (up to 180 F/g) and wide electrochemical window (up to 3.5 V) over a wide temperature range from -50 degrees C to 80 degrees C. This is the first demonstration of a carbon-ionic liquid system capable of delivering capacitance in excess of 100 F/g below room temperature. The excellent electrochemical response of the proposed couple shows that optimization of the carbon/electrolyte interface is of great importance for improving capacitive energy storage. (C) 2012 Elsevier Ltd. All rights reserved.
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