Zistler, Markus and Wachter, Philipp and Schreiner, Christian and Gores, Heiner J. (2010) Electrochemical measurement of triiodide diffusion coefficients in blends of ionic liquids Results for improving a critical parameter of dye-sensitized solar cells. JOURNAL OF MOLECULAR LIQUIDS, 156 (1). pp. 52-57. ISSN 0167-7322, 1873-3166
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Triiodide diffusion coefficients were determined in two ionic liquid based electrolyte systems for dye-sensitized solar cells. The electrolytes comprised iodine, 1-methyl-3-propylimidazolium iodide ([MPIM][I]), and either 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide or 1-ethyl-3-methylimidazolium trifluoromethanesulfonate. Determination of triiodide diffusion coefficients was performed by two independent methods, steady-state cyclic voltammetry at ultramicroelectrodes and polarization measurements at thin layer cells, both temperature-dependent and over a broad mixing range with varying ionic liquid molar ratios. The triiodide diffusion coefficients strongly increase with increasing temperature and therefore decreasing electrolyte viscosity. However, the triiodide diffusion coefficients stay almost constant with decreasing [MPIM][I] mole fraction or they even have a maximum at high [MPIM][I] mole fractions and therefore high viscosities. The Einstein-Stokes ratios for both systems strongly increase with increasing [MPIM][I] mole fraction. So as the Einstein-Stokes equation is not obeyed, a strong non-Stokesian charge transport can be assumed to occur in both electrolyte systems. (C) 2010 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHARGE-TRANSPORT; ELECTROLYTES; IODIDE; MICROELECTRODE; PERFORMANCE; CONVERSION; STABILITY; MIXTURES; CRYSTAL; SALTS; Diffusion coefficient; Ionic liquids; Non-Stokesian transport; Dye-sensitized solar cells |
| 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: | 13 Jul 2020 08:36 |
| Last Modified: | 13 Jul 2020 08:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24179 |
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