exchange current

of an electrode reaction

The common value $I 0$ of the anodic and cathodic partial currents when the reaction is at equilibrium

$I 0 = I a = − I c$

For an electrode at equilibrium at which only one reaction is significant $I = 0$ . When more than one reaction is significant at a given electrode, subscripts to $I 0$ may be used to distinguish exchange currents. $I$ is not usually zero when only one of these reactions is at equilibrium.

Source:

PAC, 1974, 37, 499(Electrochemical nomenclature) on page 513

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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.E02238.

Original PDF version: http://www.iupac.org/goldbook/E02238.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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excess volume (at a solid/liquid interface)		exchange extraction