Determination of the correct value of Cdl from the impedance results fitted by the commercially available software

2015-05-22 15:23  下载量:2

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With the introduction of a constant phase element (CPE) as a replacement for the capacity in EIS measurements, most of the experimentally obtained results could be fitted by commercially available software (Gamry, Scribner, Solartron, etc.). Much better fit results were obtained with CPE in comparison with the fit results obtained by using pure capacity, represented by parallel plate condenser. Taking into account that the CPE defines inhomogeneity of the surface in the electrochemical EIS experiments and inhomogeneity of the charge distribution in solid state EIS measurements, it is reasonable to expect that better fit for real systems is obtained by using CPE. The main problem in the use of commercially available software with CPE is the fact that the capacity, obtained by fitting procedure, does not have the dimension of capacity, i.e., F cm-2, or Ω-1cm-2 s, but its dimension is given in Ω-1 cm-2 sa, where a is the exponent in the equation for the CPE [1] ( ZCPE = Zdl(jω)-a ).

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