The iodine/iodide redox couple at a platinum electrode

L.M. Dane, L.J.J. Janssen, J.G. Hoogland

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    Abstract

    The I/iodide redox couple was studied on Pt in 0.5M H2SO4 by measuring the impedance as a function of frequency. From these measurements, the exchange c.d. j0 was derived according to Sluyters. The dependence of j0 on the reversible potential and the I and the iodide concns. was established. By comparing the theoretical slopes with the exptl. slopes, it is shown that the electrode process consists of the 3 reactions: I- -> Iad + e; Iad + I- -> I2 + e; I2 + I- -> I3-. The 2nd reaction det. the exchange c.d. The transfer coeff. is 0.5, the standard exchange c.d. is 400 ma./cm.2, and the energy of activation is 15 kcal./mole. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)507-518
    Number of pages12
    JournalElectrochimica Acta
    Volume13
    Issue number3
    DOIs
    Publication statusPublished - 1968

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