For an
electrode process at a given potential the current is controlled by the kinetics of a number of steps
which include the transport of reactants to and from the
interface and the interfacial reaction itself. The latter, which is called the electrode reaction,
must always include at least one elementary step in which charge is transferred from
one phase to the other, but may also involve purely chemical steps within the
interfacial region.
Source:
PAC, 1980, 52, 233
(Electrode reaction orders, transfer coefficients and rate constants. Amplification
of definitions and recommendations for publication of parameters)
on page 235