Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10267150 | Electrochemistry Communications | 2005 | 5 Pages |
Abstract
A new sol-gel precursor, based on 1-methyl-3-[3-(trimethoxy-λ4-silyl)propyl]imidazolium iodide (MTMSPI+Iâ), was synthesized and investigated as a potential novel quasi-solid-state ionic liquid redox electrolyte for dye-sensitized photoelectrochemical cells of the Graetzel type. MTMSPI+Iâ was hydrolyzed with acidified water and the reaction products of the sol-gel condensation reactions were assessed with the help of 29Si NMR and infrared spectroscopic techniques, which revealed that the aged MTMSPI+Iâ sols consisted of a positively charged polyhedral cube-like silsesquioxane and iodide/triiodide species. The addition of iodine increased the specific conductivity of the non-hydrolyzed and hydrolyzed MTMSPI+Iâ, which was attributed to the formation of triiodide ions and demonstrated from Raman spectra measurements. Steady-state voltammetric measurements at a Pt disc microelectrode, performed for the hydrolyzed MTMSPI+Iâ and MTMSPI+Iâ + I2 sols, revealed changes in the apparent diffusion coefficients (Dapp) during the course of transformation of the ionic liquid from a liquid to a quasi-solid-state.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Boris Orel, Angela Å urca Vuk, Vasko Jovanovski, Robi JeÅ¡e, Lidija Slemenik PerÅ¡e, Samo B. HoÄevar, Emily A. Hutton, Božidar Ogorevc, Adolf Jesih,