FARADAIC IMPEDANCE AT NONEQUILIBRIUM ELECTRODE POLARIZATION

The electrochemical impedance of cathodic deposition processes in an e xcess of inert electrolyte is calculated as a function of the electrod e overpotential eta and the signal frequency omega. The form of the fu nctional dependence of the active R and capacity C components of the i mpedance on eta and omega has been shown to be dependent on the rate c onstant, signal frequency, electrode potential and the position of the reaction plane R(e) with respect to the outer Helmholtz plane R0. The faradaic conductivity deviates essentially from the Tafel conductivit y near the zero charge point and has a sharp minimum at this point. Th e function C(eta) depends on the reaction plane position: it changes m onotonically for R(e) < R0 and passes through a minimum at the zero ch arge point for R(e) greater-than-or-equal-to R0.