Page 26 - Analytical Electrochemistry 2d Ed - Jospeh Wang

1-2 FARADAIC PROCESSES 11

FIGURE 1-5 Concentration pro®les for two rates of convection transport: low (curve a) and
high (curve b).
1-2.2 Reactions Controlled by the Rate of Electron Transfer

In this section we consider experiments in which the current is controlled by the rate
of electron transfer (i.e., reactions with suf®ciently fast mass transport). The current±
potential relationship for such reactions is different from those discussed (above) for
mass transport-controlled reactions.

FIGURE 1-6 The hydrodynamic boundary (Prandtl) layer. Also shown (as dotted line), is
the diffusion layer.