Extraordinarily Efficient Conduction in a Redox-Active Ionic Liquid

Verner K. Thorsmolle, Guido Rothenberger, Daniel Topgaard, Jan C. Brauer, Dai-Bin Kuang, Shaik M. Zakeeruddin, Björn Lindman, Michael Graetzel, Jacques-E. Moser

Research output: Contribution to journalArticlepeer-review

61 Citations (SciVal)

Abstract

Iodine added to iodide-based ionic liquids leads to extraordinarily efficient charge transport, vastly exceeding that expected for such viscous systems. Using terahertz time-domain spectroscopy, in conjunction with dc conductivity, diffusivity and viscosity measurements we unravel the conductivity pathways in 1-methyl-3-propylimidazolium iodide melts. This study presents evidence of the Grotthuss mechanism as a significant contributor to the conductivity, and provides new insights into ion pairing processes as well as the formation of polyiodides. The terahertz and transport results are reunited in a model providing a quantitative description of the conduction by physical diffusion and the Grotthuss bond-exchange process. These novel results are important for the fundamental understanding of conduction in molten salts and for applications where ionic liquids are used as charge-transporting media such as in batteries and dye-sensitized solar cells.
Original languageEnglish
Pages (from-to)145-149
JournalChemPhysChem
Volume12
Issue number1
DOIs
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Physical Chemistry

Keywords

  • electrolyte
  • conducting materials
  • ion pairs
  • ionic liquids
  • terahertz
  • spectroscopy

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