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- Title
Positively Charged Polysilsesquioxane/Iodide Ionic Liquid as a Quasi Solid-State Redox Electrolyte for Dye-Sensitized Photo Electrochemical Cells: Infrared, <sup>29</sup>Si NMR, and Electrical Studies.
- Authors
Jovanovski, Vasko; Orel, Boris; Ješe, Robi; Mali, Gregor; Stathatos, Elias; Lianos, Panagiotis
- Abstract
A new sol-gel precursor based on 1-methyl-3-[3-(trimethoxy-λ4-silyl)propyl]-1H-imidazolium iodide (MTMSPI+I- was synthesized and investigated as a potential novel quasi solid-state ionic liquid redox electrolyte for dye-synthesized photoelectrochemical (DSPEC) cells of the Graetzel type. MTMSPI+I- was hydrolyzed with acidified water and the reaction products of the sol-gel condensation reactions assessed with the help of 29Si NMR and infrared spectroscopic techniques. Results of the time-dependent spectra analyses showed the formation of positively charged polyhedral cube-like silsesquioxane species that still contained a small amount of silanol end groups, which were removed after heating at 200 °C. After cooling, the resulting material formed is a tough, yellowish, and transparent solid, which could be reheated again and used for assembling DSPEC cells. The addition of iodine increased the specific conductivity of the hydrolyzed and nonhydrolyzed MTMSPI+I-, which we attributed to the formation of triiodide ions contributed to the conductivity via the Grotthus mechanism. DSPEC cells based on a titania-dye system with MTMSPI+I- electrolyte containing iodine (0.1 M) reached an overall efficiency between 3.3-3.7%.
- Subjects
ELECTRIC batteries; ELECTROLYTES; IODIDES; OXIDATION-reduction reaction; INFRARED spectroscopy; STORAGE batteries
- Publication
International Journal of Photoenergy, 2006, p1
- ISSN
1110-662X
- Publication type
Article
- DOI
10.1155/IJP/2006/23703