The mechanism of iodine reduction by TiO 2 electrons and the kinetics of recombination in dye-sensitized solar cells

Caryl E. Richards; Assaf Y. Anderson; Stefano Martiniani; Chunhung Law; Brian C. O'Regan

doi:10.1021/jz3006755

The mechanism of iodine reduction by TiO ₂ electrons and the kinetics of recombination in dye-sensitized solar cells

Caryl E. Richards, Assaf Y. Anderson, Stefano Martiniani, Chunhung Law, Brian C. O'Regan

Research output: Contribution to journal › Article › peer-review

63 Scopus citations

Abstract

Electron transfer from TiO ₂ to iodine/iodide electrolytes proceeds via reduction of either I ₃ ^- or uncomplexed I ₂ (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I ₃ ^- concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I ₃ ^- concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.

Original language	English (US)
Pages (from-to)	1980-1984
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	3
Issue number	15
DOIs	https://doi.org/10.1021/jz3006755
State	Published - Aug 2 2012
Externally published	Yes

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10.1021/jz3006755

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abstract = "Electron transfer from TiO 2 to iodine/iodide electrolytes proceeds via reduction of either I 3 - or uncomplexed I 2 (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I 3 - concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I 3 - concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.",

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AU - Richards, Caryl E.

AU - Anderson, Assaf Y.

AU - Martiniani, Stefano

AU - Law, Chunhung

AU - O'Regan, Brian C.

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N2 - Electron transfer from TiO 2 to iodine/iodide electrolytes proceeds via reduction of either I 3 - or uncomplexed I 2 (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I 3 - concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I 3 - concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.

AB - Electron transfer from TiO 2 to iodine/iodide electrolytes proceeds via reduction of either I 3 - or uncomplexed I 2 (free iodine), but which route predominates has not previously been determined. By measurement of the electron lifetime while independently varying free iodine or I 3 - concentrations, we find the lifetime is correlated with free-iodine concentration and independent of I 3 - concentration. This trend supports the hypothesis that electron recombination to the electrolyte occurs predominantly by iodine reduction rather than reduction of triiodide.

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