![]() ![]() For instance, a resistor has an influence on the real part of impedance, and a capacitor affects its imaginary part. It is reasonable that an element in a circuit contributes to the impedance change to a certain degree. Snapshot of the equivalent circuit fitting program. 2 shows an example for a non-linear curve fitting process.įigure 4. By minimizing S, the fitted element parameters can be modified so that the result impedance ( Z i,cal) can be as close as possible to the experimental value ( Z i,exp). R for a resistor, C and f for a capacitor), then S can be calculated using its defined equation. The subscript exp indicates experimental value and the subscript cal indicates the calculated value while fitting.įor any kind of circuit, Z i,cal can be calculated by the set of element parameters and the frequency (e.g. Where S is the weighted sum of squares of error, N f is the number of frequencies within an experiment, Z i is the impedance of the i–th frequency, and w i, Re and w i, Im are the statistical weights for the real and imaginary parts of the impedance of the i–th frequency. This is a general and popular method for solving the minimum value of function E(x), where The algorithm for finding all the element parameters in a given circuit is by implementing the Levenberg-Marquardt non-linear fitting method. (a) The Nyquist plot for visualizing impedance values, and (b) an equivalent circuit with several circuit elements for modeling electrode surface reactions.Įlectrochemical Impedance Circuit Fitting Program Control, analysis, fitting – everything is in one place, saving you time and facilitating electrochemical measurements.Figure 1. Advanced analysis techniques can be managed directly in the software (no need to export) with Z-Fit EIS fitting software also embedded in the interface. The SP-150e’s versatile, comprehensive specification is complemented by BioLogic’s benchmark control and analysis software EC-Lab. The SP –150e is the only ampere workstation to boast high-current capability (800 A with boosters), three EIS quality indicators (THD, NSD, NSR) for EIS validation, and Ethernet compatibility for improved group-working. Should you need more power, this versatile electrochemical workstation will grow with your research needs. This two-channel, EIS-capable electrochemical workstation is perfect for a wide range of general electrochemistry applications, but the ☑ A current range makes it especially suitable for energy applications including battery, supercapacitor, fuel cell ( RRDE compatible), and electrolysis research. The new BioLogic SP-150e is an electrochemical workstation designed to grow with your research needs. ![]()
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January 2023
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