https://doi.org/10.1351/goldbook.D01722
A
there are two common situations in which a
faradaic current
whose magnitude is controlled by the rate at which a reactant in an electrochemical process diffuses toward an electrode-solution interface
(and, sometimes, by the rate at which a product diffuses away from that interface
). For the reaction mechanism
![Not defined](/img/inline/D01722.png)
diffusion
current can be observed. In one, the rate of formation of B from electroinactive C is small and the current is governed by the rate of diffusion
of B toward the electrode surface. In the other, C predominates at equilibrium in the bulk of the solution, but its transformation
into B is fast; C diffuses to the vicinity of the electrode surface and is there rapidly converted into B, which is reduced.