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Studies on electrical double layer capacitor with a low-viscosity ionic liquid 1-ethyl-3-methylimidazolium tetracyanoborate as electrolyte

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Abstract

The performance of an electrical double layer capacitor (EDLC) composed of high surface area activated carbon electrodes and a new ionic liquid, 1-ethyl-3-methylimidazolium tetracyanoborate, [EMIm]TCB, as the electrolyte has been investigated by impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge studies. The high ionic conductivity (~1·3 × 10 − 2 S cm − 1 at 20 °C) and low viscosity (~22 cP) of the ionic liquid, [EMIm]TCB, make it attractive as electrolyte for its use in EDLCs. The optimum capacitance value of 195·5 F g − 1 of activated carbon has been achieved with stable cyclic performance.

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Acknowledgements

Authors acknowledge the financial support received from University of Delhi (11-17 Research Fund, 2010) and the Department of Science and Technology, Government of India (Sanction No. SR/S2/CMP-45/2005). One of the authors (GPP) is grateful to CSIR, New Delhi, for the award of a Research Associateship.

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Correspondence to S A HASHMI.

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PANDEY, G.P., HASHMI, S.A. Studies on electrical double layer capacitor with a low-viscosity ionic liquid 1-ethyl-3-methylimidazolium tetracyanoborate as electrolyte. Bull Mater Sci 36, 729–733 (2013). https://doi.org/10.1007/s12034-013-0511-y

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  • DOI: https://doi.org/10.1007/s12034-013-0511-y

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