Electrochemistry · 2000 · 17 citations · 5 references
EngineeringChemical EngineeringElectrical EngineeringElectroanalytical MethodsElectrochemical EngineeringElectrochemistryElectrical MeasurementElectroanalytical ChemistryElectrochemical KineticsElectrode-electrolyte InterfacesFrequency ResponseImpedance SpectroscopyElectrochemical Impedance AnalysisElectrochemical Impedance MonitoringElectrode Impedance CharacterizationElectrode Reaction KineticsElectrode Reaction MechanismsImpedance TheoryNyquist Plot AnalysisNyquist Plots
The method to determine an instantaneous impedance was developed for the impedance without time stability. The Nyquist plot of the impedance without time stability shows the deviation from the semicircle in the low frequency range. In the present method, the impedance was measured four times successively. The measured impedance spectra were plotted on 3-D Nyquist plane, whose axes were real and imaginary components and time. The data was joined by a smooth curve at the same frequency using spline function. The instantaneous impedance can be determined by the cross section of 3-D Nyquist plot. The program of this compensation was described, and this method was applied to the impedance of iron electrode which showed inductive loop.
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