Stable deep doping of vapor-phase polymerized poly(3,4-ethylenedioxythiophene)/ionic liquid supercapacitors

Christoffer Karlsson*, James Nicholas, Drew Evans, Maria Forsyth, Maria Strømme, Martin Sjödin, Patrick C. Howlett, Cristina Pozo-Gonzalo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Liquid-solution polymerization and vapor-phase polymerization (VPP) have been used to manufacture a series of chloride- and tosylate-doped poly(3,4-ethylenedioxythiophen(PEDOT) carbon paper electrodes. The electrochemistry, specific capacitance, and specific charge were determined for single electrodes in 1-ethyl-3-methylimidazolium dicyanamide (emim dcionic liquid electrolyte. VPP-PEDOT exhibits outstanding properties with a specific capacitance higher than 300 Fg-1, the highest value reported for a PEDOT-based conducting polymer, and doping levels as high as 0.7 charges per monomer were achieved. Furthermore, symmetric PEDOT supercapacitor cells with the emim dca electrolyte exhibited a high specific capacitance (76.4 Fg-1) and high specific energy (19.8 Whkg-1). A Ragone plot shows that the VPP-PEDOTcells combine the high specific power of conventional (“pure”) capacitors with the high specific energy of batteries, a highly sought-after target for energy storage.

Original languageEnglish
Pages (from-to)2112-2121
Number of pages10
Issue number16
Publication statusPublished - 2016
Externally publishedYes


  • Doping
  • Electrochemistry
  • Ionic liquids
  • Polymerization
  • Polymers

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)


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