Temperature Dependence of the Non-Stokesian Charge Transport in Binary Blends of Ionic Liquids
Wachter P, Zistler M, Schreiner C, Fleischmann M, Gerhard D, Wasserscheid P, Barthel J, Gores HJ (2009)
Publication Type: Journal article
Publication year: 2009
Journal
Publisher: American Chemical Society
Book Volume: 54
Pages Range: 491--497
Volume: 54
Issue: 2
Journal Issue: 2
DOI: 10.1021/je800480d
Abstract
A comprehensive characterization of an ionic liquid based electrolyte for dye-sensitized solar cells (DSSC) was performed by determination of triiodide diffusion coefficients, viscosities, specific conductivities, and densities. The observed non-Stokesian transport behavior was ensured by determination of triiodide diffusion coefficients with two independent methods, steady-state cyclic voltammetry at ultramicroelectrodes, and polarization measurements at thin layer cells. The electrolyte, consisting of 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF$_4$]), 1-methyl-3-propylimidazolium iodide ([MPIM][I]), and iodine, was examined at fixed iodine concentration over a broad mixing range with varying ionic liquid molar ratio and over a broad temperature range as well. The triiodide diffusion coefficients and the specific conductivity increase with decreasing [MPIM][I] mole fraction or increasing temperature, caused by decreasing electrolyte viscosity. The Einstein$-$Stokes ratios strongly increase with increasing [MPIM][I] mole fraction and viscosity and thus do not obey the Einstein$-$Stokes equation. The magnitude of this strong non-Stokesian behavior decreases with increasing temperature. Additional non-Stokesian behavior was found for [MPIM][I]-rich blends since for these blends the Einstein$-$Stokes ratios strongly decrease at increasing temperatures and simultaneously decreasing viscosity.
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APA:
Wachter, P., Zistler, M., Schreiner, C., Fleischmann, M., Gerhard, D., Wasserscheid, P.,... Gores, H.J. (2009). Temperature Dependence of the Non-Stokesian Charge Transport in Binary Blends of Ionic Liquids. Journal of Chemical and Engineering Data, 54(2), 491--497. https://doi.org/10.1021/je800480d
MLA:
Wachter, Philipp, et al. "Temperature Dependence of the Non-Stokesian Charge Transport in Binary Blends of Ionic Liquids." Journal of Chemical and Engineering Data 54.2 (2009): 491--497.
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