Abstract
The ionic liquid 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide (BDMIM-TFSI) showed a conductivity of 1.65 mS cm−1 and an electrochemical stability window of 4.4 V at room temperature. Two types of electrodes based on carbon nanomaterials were prepared: (1) with alternating layers of two oppositely charged functionalized double-walled carbon nanotubes (DWCNTs) and (2) with the functionalized DWCNTs and graphene oxide nanoplatelets. The electrodes presented a porous morphology and a connected pathway between the carbon nanotubes and graphene oxide platelets. Electrochemical capacitors based on the carbon nanomaterials and BDMIM-TFSI were produced in a stacking configuration and were characterized at 25 °C, 60 °C, and 100 °C. The supercapacitors with electrodes based on the three alternating layers of two oppositely charged DWCNTs and graphene oxide presented higher values of capacitance, which were attributed to a morphology favorable to providing ionic access to the carbonaceous surface. Box-like voltammetric curves were used to calculate the capacitance in a 4-V potential window at 100 °C.
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Acknowledgements
R.S. Borges acknowledged scholarship from the Brazilian agency CNPq. The authors would like to thank Centro de Microscopia—UFMG for electronic microscopy images.
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Borges, R.S., Ribeiro, H., Lavall, R.L. et al. Temperature stable supercapacitors based on ionic liquid and mixed functionalized carbon nanomaterials. J Solid State Electrochem 16, 3573–3580 (2012). https://doi.org/10.1007/s10008-012-1785-5
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DOI: https://doi.org/10.1007/s10008-012-1785-5