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Silica-grafted ionic liquids for revealing the respective charging behaviors of cations and anions in supercapacitors

Author

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  • Qingyun Dou

    (Lanzhou Institute of Chemical Physics
    University of Chinese Academy of Sciences)

  • Lingyang Liu

    (Lanzhou Institute of Chemical Physics
    University of Chinese Academy of Sciences)

  • Bingjun Yang

    (Lanzhou Institute of Chemical Physics)

  • Junwei Lang

    (Lanzhou Institute of Chemical Physics)

  • Xingbin Yan

    (Lanzhou Institute of Chemical Physics)

Abstract

Supercapacitors based on activated carbon electrodes and ionic liquids as electrolytes are capable of storing charge through the electrosorption of ions on porous carbons and represent important energy storage devices with high power delivery/uptake. Various computational and instrumental methods have been developed to understand the ion storage behavior, however, techniques that can probe various cations and anions of ionic liquids separately remain lacking. Here, we report an approach to monitoring cations and anions independently by using silica nanoparticle-grafted ionic liquids, in which ions attaching to silica nanoparticle cannot access activated carbon pores upon charging, whereas free counter-ions can. Aided by this strategy, conventional electrochemical characterizations allow the direct measurement of the respective capacitance contributions and acting potential windows of different ions. Moreover, coupled with electrochemical quartz crystal microbalance, this method can provide unprecedented insight into the underlying electrochemistry.

Suggested Citation

  • Qingyun Dou & Lingyang Liu & Bingjun Yang & Junwei Lang & Xingbin Yan, 2017. "Silica-grafted ionic liquids for revealing the respective charging behaviors of cations and anions in supercapacitors," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-02152-5
    DOI: 10.1038/s41467-017-02152-5
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