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arXiv · 1011.2182

Extraordinarily Efficient Conduction in a Redox-Active Ionic Liquid

Verner K. Thorsmølle·Guido Rothenberger·Daniel Topgaard·Jan C. Brauer·Dai-Bin Kuang·Shaik M. Zakeeruddin·Björn Lindman·Michael Grätzel·Jacques-E. Moser
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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.

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Verner K. Thorsmølle, Guido Rothenberger, Daniel Topgaard, Jan C. Brauer, Dai-Bin Kuang, Shaik M. Zakeeruddin, Björn Lindman, Michael Grätzel, Jacques-E. Moser. 2010-11-09. Extraordinarily Efficient Conduction in a Redox-Active Ionic Liquid. https://doi.org/10.1002/cphc.201000819

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