146
5 Controversy of Thermodynamics Associated with Surface …
After rearrangement, Eq. (5.20) simply retrieves the generalized Lippmann equation
of Eq. (5.19) for an isotropic solid electrode in place of Eq. (5.17).
Consequently, the Shuttleworth equation cannot be an appropriate starting point
to obtain a formulation for
∂g
∂E
[15]. It is emphasized that Eq. (5.19) for a solid
electrode should be used as a starting point [15]. The Gokhshtein equation for an
isotropic solid electrode, i.e.,
∂g
∂E
ε
= −q −
∂q
∂ε
E
explicitly indicates that the
partial derivatives of
∂g
∂E
and
∂q
∂ε
are thermodynamically constrained to constant
elastic strain ε and potential E, respectively, as compared to Eq. (5.17). Furthermore,
Proost [15] pointed out that the thermodynamic constraint of constant elastic strain
does not keep for the surface stress measurement of a solid electrode as a function of
applied potential by a cantilever bending method since the curvature of the cantilever
electrode, i.e., the elastic strain changes with potential. According to Proost [15], it is
strictly inappropriate to use the equations associated with electrocapillarity of a solid
electrode derived under the constant elastic strain in order to interpret the surface
stress versus potential curve measured by a cantilever bending method. The average
value of
g
E
in some potential range obtained from the surface stress versus potential
curve by using the cantilever bending method does not meet the thermodynamic
constraint of constant elastic strain.
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