Measures the rate of the interfacial reaction, the proportionality constant being the charge number of the reaction multiplied by the Faraday constant.
Source:
PAC, 1980, 52, 233. 'Electrode Reaction Orders, Transfer Coefficients and Rate Constants. Amplification of Definitions and Recommendations for Publication of Parameters' on page 236 (https://doi.org/10.1351/pac198052010233)