|
·
In
steady state, the oxidation and
reduction reactions must have the
same rate as charge acccumulation cannot occur in the metal. The metal
is also at a uniform potential in this condition so that the overvoltage
of the system is VC ( - 0.486 V) and the associated reaction
current is iC ( 1.19 x 10-4
A/cm2).
· Each
of the uncoupled reversible half cells in this reaction have their own
electrode potentials. For the (H+/H2)system,
V = 0 by definition and the equilibrium exchange current, ie,
is 10-10
A/cm2. For the (Zn/Zn2+)
system,
V
= - 0.763 V and ie
= 10-7
A/cm2. |
