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      Positively charged polysilsesquioxane/iodide lonic liquid as a quasi solid-state redox electrolyte for dye-sensitized photo electrochemical cells: Infrared,\(\text{29}\text{Si}\)NMR, and electrical studies

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          Abstract

          A new sol-gel precursor based on 1-methyl-3-[3-(trimethoxy- λ 4 -silyl)propyl]-1 H -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 29 Si 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%.

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          A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films

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            Light-Induced Redox Reactions in Nanocrystalline Systems

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              Hydrophobic, Highly Conductive Ambient-Temperature Molten Salts.

              New, hydrophobic ionic liquids with low melting points (<-30 degrees C to ambient temperature) have been synthesized and investigated, based on 1,3-dialkyl imidazolium cations and hydrophobic anions. Other imidazolium molten salts with hydrophilic anions and thus water-soluble are also described. The molten salts were characterized by NMR and elemental analysis. Their density, melting point, viscosity, conductivity, refractive index, electrochemical window, thermal stability, and miscibility with water and organic solvents were determined. The influence of the alkyl substituents in 1, 2, 3, and 4(5)-positions on these properties was scrutinized. Viscosities as low as 35 cP (for 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide (bis(triflyl)amide) and trifluoroacetate) and conductivities as high as 9.6 mS/cm were obtained. Photophysical probe studies were carried out to establish more precisely the solvent properties of 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide). The hydrophobic molten salts are promising solvents for electrochemical, photovoltaic, and synthetic applications.
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                Author and article information

                Journal
                International Journal of Photoenergy
                International Journal of Photoenergy
                Hindawi Limited
                1110-662X
                1687-529X
                2006
                2006
                : 2006
                :
                : 1-8
                10.1155/IJP/2006/23703
                © 2006

                http://creativecommons.org/licenses/by/3.0/

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