Fig. 5.
Equivalent circuits used for fitting of impedance spectra. The circuits shown in (a) and (b) are adapted from circuits derived in Ref. [7]; high electronic conductivity is assumed and the transmission line is approximated by 50 RTL, CTL-elements (Rdiff = 50RTL and Cchem = 50CTL). Circuit (a) results when neglecting RTL (i.e. ion transport resistances) and Cs in (b). The incomplete equivalent circuit shown in (c) was used to fit only the low frequency impedance using a beforehand determined and fixed value of RYSZ.