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Vol. 35 No. 1
January-February 2013

The Project Place | Information about new, current, and complete IUPAC projects and related initiatives.
See also www.iupac.org/projects

Provisional Recommendations
www.iupac.org/reports/provisional

Definition of the Transfer Coefficient

The transfer coefficient α is a quantity that is commonly employed in the kinetic investigation of electrode processes. An unambiguous definition of the transfer coefficient, independent of any mechanistic consideration and exclusively based on experimental data, is proposed. The cathodic transfer coefficient αc is defined as —(RT/F)(dln jc/dE), where jc is the cathodic current density corrected for any changes in the reactant concentration on the electrode surface with respect to its bulk value, E is the applied potential and R, T and F have their usual significance. The anodic transfer coefficient αa is defined similarly, by simply replacing jc with the anodic current density and the minus sign with the plus sign. This recommendation aims at clarifying and improving the definition of the transfer coefficient reported in the 3rd edition of the IUPAC “Green Book.”

Comments by 31 March 2013

Professor Rolando Guidelli
University of Florence
Department of Chemistry “Ugo Schiff”
Via della Lastruccia 3
I-50014 Sesto Fiorentino (Firenze), Italy

E-mail: guidelli@unifi.it

www.iupac.org/project/2011-038-1-100


 

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