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Springer Verlag, Journal of Solid State Electrochemistry, 11(16), p. 3573-3580

DOI: 10.1007/s10008-012-1785-5

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Temperature stable supercapacitors based on ionic liquid and mixed functionalized carbon nanomaterials

Journal article published in 2012 by R. S. Borges, H. Ribeiro ORCID, R. L. Lavall, G. G. Silva
This paper is available in a repository.
This paper is available in a repository.

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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.