Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 13, Pages 6274-6279Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16391h
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Funding
- National Science Council of Taiwan [99-2218-E-008-007-MY3, 100-2221-E-006-239-MY3]
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Butylmethylpyrrolidinium-dicyanamide (BMP-DCA) ionic liquid (IL), which enables the pseudocapacitive behavior of a MnO2 electrode, performing over a wide potential range of 3 V, is considered to be a promising electrolyte for supercapacitors. Various additives are doped in this IL electrolyte in attempt to further improve the electrochemical performance of MnO2; NaDCA is found to be the most effective. An appropriate concentration (similar to 0.01 M) of NaDCA in the IL can optimize the capacitance of the MnO2 electrode; the values are 100 and 125 F g(-1) at 25 and 50 degrees C, respectively. The NaDCA-doped IL is superior to traditional aqueous electrolytes for high-energy, high-power, elevated-temperature, and long-life MnO2 supercapacitor applications.
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