Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 11, Pages 3706-3712Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta00981e
Keywords
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Funding
- Fundamental Research Funds for the Central Universities [lzujbky-2012-69, lzujbky-2012-79, lzujbky-2012-22]
- Science and Technology Program of Gansu Province of China [1107RJYA004]
- Natural Science Foundation of China [20903050]
- National Science Talents Foundation of China [J1103307]
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In this work, the electrochemical properties of a MnO2 nanocomposite electrode were investigated in 1-butyl-3-methyl-imidazolium hexafluorophosphate ([Bmim]PF6)/N,N-dimethylformamide (DMF) electrolyte. The [Bmim]PF6/DMF electrolyte with different volume fractions exhibits significant influence on the electrochemical properties of the electrode. When the volume ratio of [Bmim]PF6 and DMF was 1 : 1, the electrode showed the best electrochemical performance. The operation potential window of the MnO2 nanocomposite electrode in ionic liquids was 2.1 V and the specific capacitance according to the mass of MnO2 was 523.3 F g(-1) at 3 A g(-1). Then, a high-voltage (3 V) MnO2 asymmetric supercapacitor was successfully fabricated, using the MnO2 nanocomposite electrode, activated carbon and [Bmim]PF6/DMF as the positive electrode, negative electrode and electrolyte, respectively. The MnO2 asymmetric supercapacitor displayed a maximum specific energy of 67.5 W h kg(-1) at a specific power of 593.8 W kg(-1) and a maximum specific power of 20.4 kW kg(-1) at a specific energy of 8.5 W h kg(-1). The impressive results showed that [Bmim]PF6/DMF could be a promising electrolyte for MnO2 supercapacitors.
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