Effect of activated carbon xerogel pore size on the capacitance performance of ionic liquid electrolytes

Fiona. B. Sillars, S. Isobel Fletcher, Mojtaba Mirzaeian, Peter J. Hall

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

The use of ionic liquid (IL) electrolytes promises to improve the energy density of electrochemical capacitors (ECs) by allowing for operation at higher voltages. Several studies have also shown that the pore size distribution of materials used to produce electrodes is an important factor in determining EC performance. In this research the capacitative, energy and power performance of ILs 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF(4)), 1-ethyl-3-methylimidazolium dicyanamide (EMImN(CN)(2)), 1,2-dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (DMPImTFSI), and 1-butyl-3-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate (BMPyT(F5Et)PF3) were studied and compared with the commercially utilised organic electrolyte 1M tetraethylammonium tetrafluoroborate solution in anhydrous propylene carbonate (Et4NBF4-PC 1 M). To assess the effect of pore size on IL performance, controlled porosity carbons were produced from phenolic resins activated in CO2. The carbon samples were characterised by nitrogen adsorption-desorption at 77 K and the relevant electrochemical behaviour was characterised by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The best capacitance performance was obtained for the activated carbon xerogel with average pore diameter 3.5 nm, whereas the optimum rate performance was obtained for the activated carbon xerogel with average pore diameter 6 nm. When combined in an EC with IL electrolyte EMImBF(4) a specific capacitance of 210 F g(-1) was obtained for activated carbon sample with average pore diameter 3.5 nm at an operating voltage of 3 V. The activated carbon sample with average pore diameter 6 nm allowed for maximum capacitance retention of approximately 70% at 64 mA cm(-2).

LanguageEnglish
Pages695-706
Number of pages12
JournalEnergy & Environmental Science
Volume4
Issue number3
Early online date1 Nov 2010
DOIs
Publication statusPublished - 1 Mar 2011

Fingerprint

Ionic Liquids
Xerogels
Ionic liquids
Activated carbon
electrolyte
Electrolytes
Pore size
activated carbon
Capacitance
Capacitors
Carbon
Imides
Phenolic resins
Tetraethylammonium
carbon
Electric potential
Electrochemical impedance spectroscopy
Interleukin-1
Cyclic voltammetry
Propylene

Keywords

  • double-layer capacitors
  • physicochemical properties
  • aerogel electrodes
  • mesoporous carbons
  • porous carbon
  • supercapacitor
  • resorcinol

Cite this

Sillars, Fiona. B. ; Fletcher, S. Isobel ; Mirzaeian, Mojtaba ; Hall, Peter J. / Effect of activated carbon xerogel pore size on the capacitance performance of ionic liquid electrolytes. In: Energy & Environmental Science. 2011 ; Vol. 4, No. 3. pp. 695-706.
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Effect of activated carbon xerogel pore size on the capacitance performance of ionic liquid electrolytes. / Sillars, Fiona. B.; Fletcher, S. Isobel; Mirzaeian, Mojtaba; Hall, Peter J.

In: Energy & Environmental Science, Vol. 4, No. 3, 01.03.2011, p. 695-706.

Research output: Contribution to journalArticle

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AB - The use of ionic liquid (IL) electrolytes promises to improve the energy density of electrochemical capacitors (ECs) by allowing for operation at higher voltages. Several studies have also shown that the pore size distribution of materials used to produce electrodes is an important factor in determining EC performance. In this research the capacitative, energy and power performance of ILs 1-ethyl-3-methylimidazolium tetrafluoroborate (EMImBF(4)), 1-ethyl-3-methylimidazolium dicyanamide (EMImN(CN)(2)), 1,2-dimethyl-3-propylimidazolium bis(trifluoromethylsulfonyl)imide (DMPImTFSI), and 1-butyl-3-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate (BMPyT(F5Et)PF3) were studied and compared with the commercially utilised organic electrolyte 1M tetraethylammonium tetrafluoroborate solution in anhydrous propylene carbonate (Et4NBF4-PC 1 M). To assess the effect of pore size on IL performance, controlled porosity carbons were produced from phenolic resins activated in CO2. The carbon samples were characterised by nitrogen adsorption-desorption at 77 K and the relevant electrochemical behaviour was characterised by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The best capacitance performance was obtained for the activated carbon xerogel with average pore diameter 3.5 nm, whereas the optimum rate performance was obtained for the activated carbon xerogel with average pore diameter 6 nm. When combined in an EC with IL electrolyte EMImBF(4) a specific capacitance of 210 F g(-1) was obtained for activated carbon sample with average pore diameter 3.5 nm at an operating voltage of 3 V. The activated carbon sample with average pore diameter 6 nm allowed for maximum capacitance retention of approximately 70% at 64 mA cm(-2).

KW - double-layer capacitors

KW - physicochemical properties

KW - aerogel electrodes

KW - mesoporous carbons

KW - porous carbon

KW - supercapacitor

KW - resorcinol

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