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Author Licht, S. ♦ Myung, N.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword SOLAR ENERGY ♦ MATERIALS SCIENCE ♦ TUNGSTEN SELENIDES ♦ OPTICAL PROPERTIES ♦ ELECTRICAL PROPERTIES ♦ SOLAR CELLS ♦ ELECTRODES ♦ ABSORPTION SPECTRA ♦ IODIDES
Abstract Aqueous polyiodide solutions were investigated with LTV/visible spectroscopy, and equilibria and speciation of solutions relevant to n-WSe{sub 2} photoelectrochemistry were determined. At 1 molal or greater iodide concentrations the spectral variation is consistent with assignment of a new 359 nm I{sub 4}{sup 2{minus}} absorbance peak and an equilibrium constant of 0.2 associated with I{sub 3}{sup {minus}} + I{sup {minus}} + {r_reversible} I{sub 4}{sup 2 {minus}}. I{sup {minus}}, I{sub 3}{sup {minus}}, and I{sub 4}{sup 2{minus}} 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.
ISSN 00134651
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-03-01
Publisher Place United States
Journal Journal of the Electrochemical Society
Volume Number 142
Issue Number 3


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