Impedance spectroscopic study using nanoporous electrode on room temperature ionic liquid-propanol mixtures

Hiroshi Abe, Masami Aono, Satoshi Kameoka, An Pan Tsai, Yukihiro Yoshimura, Shinichiro Ozawa

    Research output: Contribution to journalArticlepeer-review

    Abstract

    AC impedance spectroscopic approach is applied into room temperature ionic liquid (RTIL) based mixtures. The RTIL is hydrophobic 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, [C2mim][TFSI]. For higher efficient electric double layer capacitor (EDLC) as an energy storage device, Cu3Au nanoporous electrode is assembled in the [C2mim][TFSI]-propanol mixtures. Due to high cost and high viscosity of the pure [C2mim][TFSI], an additive is required in order to achieve the low cost and quick electrochemical response for rapid charge/ discharge. Propanol having relative low vapor pressure among alcohols is adequate to reduce viscosity of the hydrophobic RTILs. With nanoporous metallic electrode, the EDL capacitance in the mixtures exceed that in the pure [C2mim][TFSI]. Also, the capacitance in the mixtures was large enough up to 80 mol% propanol. In addition, isomer effect of propanol was seen in the AC impedance spectra.

    Original languageEnglish
    Pages (from-to)1015-1020
    Number of pages6
    JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
    Volume93
    Issue number10
    DOIs
    Publication statusPublished - 2014 Jan 1

    Keywords

    • AC impedance spectroscopy
    • Electric double layer
    • Nanoporous electrode
    • Propanol isomer effect
    • Room temperature ionic liquid

    ASJC Scopus subject areas

    • Energy(all)

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