Über Beiträge einzelner Elektrodenprozesse zur Impedanz

Abstract

Abstract An electrode process is directly contributing to the impedance only in the case of its flux and its generalized force being connected with a charge transport and a voltage resp. (“electric process”). E. g. conduction and transfer reactions cause resistances, charging processes in the simplest case cause capacitances. Complications by gradients (e. g. of conductivity) within the dielectric are discussed. — A contribution to the impedance by another process appears provided that such a concentration is altered by it, the rate of an “electric process” depends on, too. Especially this is the case with common reactants. The kind of coupling is effecting a dependence of the contribution to the impedance on data of both processes. — The elements of impedance are determined by parameters independent of frequency, the meaning of which is discussed. In case of elements depending only on one parameter, it is a resistance, a capacity, a Warburg‐parameter, or an inductivity. Additional parameters have the meaning of rate or time constants or a geometrical meaning. From all parameters kinetic data of the electrode processes occurring are available. Therefore, the task of evaluation of impedance spectra may be understood as estimation of the values of these parameters.