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Morpholinium-based ionic liquid mixtures as electrolytes in electrochemical double layer capacitors

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Abstract

Butyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide [ButMetMor][TFSI] and Ethyl-Methyl-Morpholinum bis(trifluoromethanesulphonyl)imide [EtMetMor][TFSI] and their mixtures with propylene carbonate (PC) were investigated as potential electrolytes in an electrochemical double layer capacitor (EDLC). Temperature dependencies of conductivity and electrochemical stability windows of ionic liquids (ILs) as well as their mixtures were determined. PC mixtures give higher conductivity with maximum ca. 1:4 (IL:PC) molar rate. Temperature dependencies of conductivity follow the Arrhenius type, showing higher energy activation for neat ILs rather than for mixtures. The EDLC was constructed based on activated carbon cloth (ACC, Kynol®) ca. 2000 m2 g−1 and IL:PC mixture giving specific capacitance of ca. 100–120 F g−1.

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Abbreviations

[EtMeMor][TFSI]:

Etyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide

[ButMetMor][TFSI]:

Butyl-Methyl-Morpholinium bis(trifluoromethanesulphonyl)imide

EDLC:

Electrochemical double layer capacitor

PC:

Propylene carbonate

AN:

Acetonitrile

DMSO:

Dimethylsulphoxide

DSC:

Differential scanning calorimetry

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Acknowledgements

This study was supported by grant KBN 31-1240/T08/2005.

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Authors and Affiliations

  1. Faculty of Chemical Technology, Poznan University of Technology, Pl. M.Sklodowskiej-Curie 5, 60 965, Poznan, Poland

    Maciej Galinski & Izabela Stepniak

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  1. Maciej Galinski
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  2. Izabela Stepniak
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Correspondence to Maciej Galinski.

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Galinski, M., Stepniak, I. Morpholinium-based ionic liquid mixtures as electrolytes in electrochemical double layer capacitors. J Appl Electrochem 39, 1949–1953 (2009). https://doi.org/10.1007/s10800-009-9904-4

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