Mechanism of bromine evolution at a graphite electrode

L.J.J. Janssen, J.G. Hoogland

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    Abstract

    The mechanism of the electrochem. Br evolution at a graphite electrode is elucidated. Br is formed according to the Volmer-Heyrovsky mechanism, the Heyrovsky reaction being the rate-detg. step, Br- -> Brads + e and Br- + Brads -> Br2 + e. For a soln. contg. 4M NaBr, 0.1M Br2, and M H2SO4, the activation energy at the reversible potential is 9 +- 2 kcal/mole; the geometric exchange c.d. is 0.2 mA/cm2 at 25 Deg; the real exchange c.ds. at 25 Deg of the Volmer and of the Heyrovsky reaction are 2.0 mA/cm2 and 0.1 mA/cm2, resp.; the degree of coverage of graphite by at. Br at the reversible potential is 0.17; and the transfer coeff. of the Heyrovsky reaction is 0.5. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)1677-1683
    Number of pages7
    JournalElectrochimica Acta
    Volume15
    Issue number10
    DOIs
    Publication statusPublished - 1970

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