Also contains definitions of: surface reaction in electrochemistry, volume reaction in electrochemistry
https://doi.org/10.1351/goldbook.K03399
A
faradaic current
that corresponds to the reduction or oxidation
of an electroactive substance
formed by a prior chemical reaction
from another substance that is not electroactive, and that is partially or entirely controlled by the rate of that reaction. The reaction may be heterogeneous, occurring at an electrode-solution interface
(surface reaction), or it may be homogeneous, occurring at some distance from the interface
(volume reaction).