The Mechanism of Iodine Reduction by TiO2 Electrons and the Kinetics of Recombination in Dye-Sensitized Solar Cells

Electron transfer from TiO2 to iodine/iodide electrolytes proceeds via reduction of either I3 – 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 I3 – concentrations, we...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2012-08, Vol.3 (15), p.1980-1984
Main Authors: Richards, Caryl E, Anderson, Assaf Y, Martiniani, Stefano, Law, ChunHung, O’Regan, Brian C
Format: Article
Language:English
Subjects:
Kinetics and Dynamics
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Summary:Electron transfer from TiO2 to iodine/iodide electrolytes proceeds via reduction of either I3 – 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 I3 – concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I3 – concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz3006755