Positively charged polysilsesquioxane/iodide lonic liquid as a quasi solid-state redox electrolyte for dye-sensitized photo electrochemical cells: infrared, <mml:math alttext="$^{{ext{29}}} {ext{Si}}$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mrow> <mml:mtext>29</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Si</mml:mtext> </mml:mrow> </mml:math> NMR, and electrical studies
<p>A new sol-gel precursor based on 1-methyl-3-[3-(trimethoxy-<mml:math alttext="$lambda^4$"> <mml:mrow> <mml:msup> <mml:mi>λ</mml:mi> <mml:mn>4</mml:mn> </mml:msup> </mml:mrow> </mml:math>-silyl...
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| Format: | Article |
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| Language: | English |
| Published: |
Wiley
2006-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://www.hindawi.com/GetArticle.aspx?doi=10.1155/IJP/2006/23703 |
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| Summary: | <p>A new sol-gel precursor based on 1-methyl-3-[3-(trimethoxy-<mml:math alttext="$lambda^4$"> <mml:mrow> <mml:msup> <mml:mi>λ</mml:mi> <mml:mn>4</mml:mn> </mml:msup> </mml:mrow> </mml:math>-silyl)propyl]-1<mml:math alttext="$H$"> <mml:mi>H</mml:mi> </mml:math>-imidazolium iodide (MTMSPI<mml:math alttext="$^+I^-$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mtext>+</mml:mtext> </mml:msup> <mml:msup> <mml:mtext>I</mml:mtext> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:math>) 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<mml:math alttext="$^+I^-$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mtext>+</mml:mtext> </mml:msup> <mml:msup> <mml:mtext>I</mml:mtext> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:math> was hydrolyzed with acidified water and the reaction products of the sol-gel condensation reactions assessed with the help of <mml:math alttext="$^{{ext{29}}} {ext{Si}}$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mrow> <mml:mtext>29</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Si</mml:mtext> </mml:mrow> </mml:math> 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 <mml:math alttext="$200un{^{circ} C}$"> <mml:mrow> <mml:mn>200</mml:mn><mml:msup> <mml:mtext></mml:mtext> <mml:mo>°</mml:mo> </mml:msup> <mml:mtext>C</mml:mtext> </mml:mrow> </mml:math>. 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<mml:math alttext="$^+I^-$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mtext>+</mml:mtext> </mml:msup> <mml:msup> <mml:mtext>I</mml:mtext> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:math>, 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<mml:math alttext="$^+I^-$"> <mml:mrow> <mml:msup> <mml:mi></mml:mi> <mml:mtext>+</mml:mtext> </mml:msup> <mml:msup> <mml:mtext>I</mml:mtext> <mml:mo>−</mml:mo> </mml:msup> </mml:mrow> </mml:math> electrolyte containing iodine (0.1 M) reached an overall efficiency between 3.3–3.7%.</p> |
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| ISSN: | 1110-662X |