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concentration overpotential
The concentration overpotential of an electrode reaction at a given electrode current density (Math - text) is basically the difference in equilibrium potentials across the diffusion layer. More precisely, it is the potential of a reference electrode (of the same electrode reaction as the working electrode ) with the interfacial concentrations which establish themselves at Math - text, relative to the potential of a similar reference electrode with the concentrations of the bulk solution. From such a measured potential difference, with Math - text flowing, one needs to subtract the ohmic potential drop prevailing between the two electrodes.
PAC, 1981, 53, 1827 (Nomenclature for transport phenomena in electrolytic systems) on page 1838
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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. doi:10.1351/goldbook.
Last update: 2008-09-12; version: 2.0.1.
DOI of this term: doi:10.1351/goldbook.C01230.
Original PDF version (may be out of date): http://www.iupac.org/goldbook/C01230.pdf.
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