Properties of Warburg and Gerischer diffusion impedanses in low frequencies region

The influence of volumetric charge on the diffusion impedance of bounded size in the electrochemical cell was studied for the first time. The exact expression for the frequency dependences of conductivity and capacity of the investigated model was obtained. This allows to consider it as a new electrochemical element with distributed constants (BG). It is shown that BG transforms in first to Gerischer impedance (G) and then in Warburg impedance (W) by increasing frequency. The criterion is discovered which helps to distinguish G from W, using experimental data of impedance spectroscopy. Comparative analysis of electrical properties of Bounded Warburg (BW) and Bounded Gerischer (BG) impedances has been carried out. Experimentally observed features for every examined models are determined.