Positively charged polysilsesquioxane/iodide lonic liquid as a quasi solid-state redox electrolyte for dye-sensitized photo electrochemical cells: Infrared, 29Si NMR, and electrical studies
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−...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2006-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/IJP/2006/23703 |
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| Summary: | 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%. |
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| ISSN: | 1110-662X 1687-529X |