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1589255 
Journal Article 
Photomodulated Voltammetry of Iodide/Triiodide Redox Electrolytes and Its Relevance to Dye-Sensitized Solar Cells 
Boschloo, G; Gibson, EA; Hagfeldt, A 
2011 
1 
Journal of Physical Chemistry Letters
ISSN: 1948-7185 
2 
24 
3016-3020 
WOS:000298215000003 
Photomodulated voltammetry was used to determine the redox
potentials of the diiodide radical (I(2)(-center dot)) in water, acetonitrile, and 3-
methoxypropionitrile. Iodide/triiodide redox electrolytes were exposed to modulated blue light,
resulting in I(2)(-center dot) generation. Using transparent fluorine-doped tinoxide (FTO)
electrodes, two modulated photocurrent waves could be discerned in the voltammogram, from which
the formal potentials for oxidation and reduction reactions of the diiodide radical were
determined. E(0)'(I(2)(-center dot)/I(-)) was found to be +0.79 and +1.04 V versus NHE in
acetonitrile and water, respectively. These values give guidelines for E(0)'(D(+)/D) required
for efficient regeneration of dyes used in dye-sensitized solar cells