The Mechanism of Iodine Reduction by TiO2 Electrons and the Kinetics of Recombination in Dye-Sensitized Solar Cells
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- 作者：Caryl E. Richards ; Assaf Y. Anderson ; Stefano Martiniani ; ChunHung Law ; Brian C. O鈥橰egan
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：August 2, 2012
- 年：2012
- 卷：3
- 期：15
- 页码：1980-1984
- 全文大小：293K
- 年卷期：v.3,no.15(August 2, 2012)
- ISSN：1948-7185
文摘
Electron transfer from TiO2 to iodine/iodide electrolytes proceeds via reduction of either I3p>鈥?/sup> or uncomplexed I2 (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I3p>鈥?/sup> concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I3p>鈥?/sup> concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.