Wachter, Philipp and Zistler, Markus and Schreiner, Christian and Fleischmann, Matthias and Gerhard, Dirk and Wasserscheid, Peter and Barthel, Joseph and Gores, Heiner J. (2009) Temperature Dependence of the Non-Stokesian Charge Transport in Binary Blends of Ionic Liquids. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 54 (2). pp. 491-497. ISSN 0021-9568,
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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][BF4]), 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SENSITIZED SOLAR-CELLS; TRIIODIDE DIFFUSION-COEFFICIENT; ELECTROLYTES; IODIDE; PERFORMANCE; CONVERSION; SALTS; ELECTROCHEMISTRY; MICROELECTRODE; DICYANAMIDE; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Heiner Jakob Gores |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Oct 2020 06:02 |
| Last Modified: | 07 Oct 2020 06:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/29527 |
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