Mechanism of bromine evolution at a graphite electrode

L.J.J. Janssen; J.G. Hoogland

doi:10.1016/0013-4686(70)80088-3

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 language	English
Pages (from-to)	1677-1683
Number of pages	7
Journal	Electrochimica Acta
Volume	15
Issue number	10
DOIs	https://doi.org/10.1016/0013-4686(70)80088-3
Publication status	Published - 1970

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title = "Mechanism of bromine evolution at a graphite electrode",

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)]",

author = "L.J.J. Janssen and J.G. Hoogland",

year = "1970",

doi = "10.1016/0013-4686(70)80088-3",

language = "English",

volume = "15",

pages = "1677--1683",

journal = "Electrochimica Acta",

issn = "0013-4686",

publisher = "Elsevier",

number = "10",

}

TY - JOUR

T1 - Mechanism of bromine evolution at a graphite electrode

AU - Janssen, L.J.J.

AU - Hoogland, J.G.

PY - 1970

Y1 - 1970

N2 - 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)]

AB - 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)]

U2 - 10.1016/0013-4686(70)80088-3

DO - 10.1016/0013-4686(70)80088-3

M3 - Article

SN - 0013-4686

VL - 15

SP - 1677

EP - 1683

JO - Electrochimica Acta

JF - Electrochimica Acta

IS - 10

ER -

Mechanism of bromine evolution at a graphite electrode

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