Electric double layer capacitors of high volumetric energy based on ionic liquids and hierarchical-pore carbon

Hsin Chieh Huang, Cheng Wei Huang, Chien Te Hsieh, Hsisheng Teng

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In this study, we analyze the high-voltage charge-storage behavior of electric double-layer capacitors in which two ionic-liquid electrolytes are used, 1-ethyl-3-methylimidazolium and 1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imides (EMIm- and MPPy-TFSIs), and are operated at 3.5 and 4.1 V, respectively. Symmetric two-electrode capacitor cells assembled using micropore-rich activated mesophase pitch (aMP) and activated carbon fiber (aCF) carbons show a standard capacitive behavior in cyclic voltammetry analysis, whereas cells featuring templated mesoporous carbon (tMC) show ion-intercalating peaks in high-voltage scans. Impedance analysis performed at high voltages reveals that the aMP and aCF cells show lower charge-storage resistance than the tMC, although tMC facilitates ion transport more efficiently than aMP and aCF. The experimental results indicate that micropore-rich aMP and aCF accommodate single ions at high voltages, whereas the carbon structure is destroyed in micropore-deficient tMC because of graphitic-layer intercalation. The aMP carbon, which contains hierarchically connected micropores and mesopores, is effective in storing charge at a high rate at high voltages. Because of the compact feature of aMP, incorporating ionic liquids with aMP represents a very promising strategy for assembling capacitors of ultrahigh volumetric energy densities.

Original languageEnglish
Pages (from-to)14963-14972
Number of pages10
JournalJournal of Materials Chemistry A
Volume2
Issue number36
DOIs
Publication statusPublished - 2014 Sep 28

Fingerprint

Ionic Liquids
Ionic liquids
Carbon
Activated carbon
Carbon fibers
Electric potential
Ions
Capacitors
Imides
Intercalation
Supercapacitor
Electrolytes
Cyclic voltammetry
Electrodes
carbon fiber

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

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abstract = "In this study, we analyze the high-voltage charge-storage behavior of electric double-layer capacitors in which two ionic-liquid electrolytes are used, 1-ethyl-3-methylimidazolium and 1-methyl-1-propylpyrrolidinium bis(trifluoromethylsulfonyl)imides (EMIm- and MPPy-TFSIs), and are operated at 3.5 and 4.1 V, respectively. Symmetric two-electrode capacitor cells assembled using micropore-rich activated mesophase pitch (aMP) and activated carbon fiber (aCF) carbons show a standard capacitive behavior in cyclic voltammetry analysis, whereas cells featuring templated mesoporous carbon (tMC) show ion-intercalating peaks in high-voltage scans. Impedance analysis performed at high voltages reveals that the aMP and aCF cells show lower charge-storage resistance than the tMC, although tMC facilitates ion transport more efficiently than aMP and aCF. The experimental results indicate that micropore-rich aMP and aCF accommodate single ions at high voltages, whereas the carbon structure is destroyed in micropore-deficient tMC because of graphitic-layer intercalation. The aMP carbon, which contains hierarchically connected micropores and mesopores, is effective in storing charge at a high rate at high voltages. Because of the compact feature of aMP, incorporating ionic liquids with aMP represents a very promising strategy for assembling capacitors of ultrahigh volumetric energy densities.",
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Electric double layer capacitors of high volumetric energy based on ionic liquids and hierarchical-pore carbon. / Huang, Hsin Chieh; Huang, Cheng Wei; Hsieh, Chien Te; Teng, Hsisheng.

In: Journal of Materials Chemistry A, Vol. 2, No. 36, 28.09.2014, p. 14963-14972.

Research output: Contribution to journalArticle

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