Preferred Label : migration current;
IUPAC definition : The difference between the current that is actually obtained, at any particular value
of the potential of the indicator or working electrode, for the reduction or oxidation
of an ionic electroactive substance and the current that would be obtained, at the
same potential, if there were no transport of that substance due to the electric field
between the electrodes. The sign convention regarding current is such that the migration
current is negative for the reduction of a cation or for the oxidation of an anion,
and positive for the oxidation of a cation or the reduction of an anion. Hence the
migration current may tend to either increase or decrease the total current observed.
In any event the migration current approaches zero as the transport number of the
electroactive substance is decreased by increasing the concentration of the supporting
electrolyte, and hence the conductivity;
Origin ID : M03921;
See also
The difference between the current that is actually obtained, at any particular value
of the potential of the indicator or working electrode, for the reduction or oxidation
of an ionic electroactive substance and the current that would be obtained, at the
same potential, if there were no transport of that substance due to the electric field
between the electrodes. The sign convention regarding current is such that the migration
current is negative for the reduction of a cation or for the oxidation of an anion,
and positive for the oxidation of a cation or the reduction of an anion. Hence the
migration current may tend to either increase or decrease the total current observed.
In any event the migration current approaches zero as the transport number of the
electroactive substance is decreased by increasing the concentration of the supporting
electrolyte, and hence the conductivity
