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Aqueous polyiodide solutions were investigated with UV/visible spectroscopy, and equilibria and speciation of solutions relevant to photoelectrochemistry were determined. At 1 molal or greater iodide concentrations the spectral variation is consistent with assignment of a new 359 nm absorbance peak and an equilibrium constant of 0.2 associated with are shown to be at significant concentration in these electrolytes. At light intensities over 10 suns, photoetching and photocorrosion occur in mass‐transport limited 1 molal polyiodide electrolytes. However, regenerative polyiodide oxidation is sustained in more concentrated electrolytes.
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Licht et al. (1995) studied this question.
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