Goldbook title
IUPAC > Gold Book > alphabetical index > C > current efficiency
Gold G Icon
Indexes Download

current efficiency

Also contains definition of: metal distribution

If several reactions take place simultaneously at the electrode a partial electrode current density (c.d.) j k can be assigned to each reaction. It is given by the stoichiometry of the reaction and by the amount of substance of B reacting (per unit time and per unit electrode area) in the reaction considered. The current efficiency of reaction k, ɛ k is defined as the ratio of j k to the total c.d.:
ɛ k = j k ∑ m j m
Note that ɛ k may be larger than one if cathodic and anodic reactions take place simultaneously at the same electrode. However, ɛ k still gives correctly the product yield, which is the quantity of industrial interest. The product yield is the amount of substance of B produced per unit charge and is equal to ɛ k ν B , k n k F (in the absence of a chemical reaction which is consecutive to the electrode reaction and which consumes or produces species B). n k is the charge number of electrode reactionk. Note that in the case of simultaneous electrode reactions the distribution of the partial c.d. j k may be different from that of the total c.d., i.e. the function j k x j = f k x may be different from j x j = f x. In electroplating the term 'metal distribution' is sometimes used to designate the distribution f k x of the partial c.d. for metal deposition.
PAC, 1981, 53, 1827 (Nomenclature for transport phenomena in electrolytic systems) on page 1836
Interactive Link Maps
First Level Second Level Third Level
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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term:
Original PDF version: The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
Current PDF version | Version for print | History of this term