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- Randles_circuit abstract "A Randles circuit is an equivalent electrical circuit that consists of an active electrolyte resistance RS in series with the parallel combination of the double-layer capacitance Cdl and an impedance of a faradaic reaction. It is commonly used in Electrochemical impedance spectroscopy (EIS) for interpretation of impedance spectra, often with a Constant phase element (CPE) replacing the double layer capacity (Cdl).Figure 1 shows the equivalent circuit initially proposed by John Edward Brough Randles for modeling of interfacial electrochemical reactions in presence of semi-infinite linear diffusion of electroactive particles to flat electrodes. In this model, the impedance of a faradaic reaction consists of an active charge transfer resistance Rct and a specific electrochemical element of diffusion W, which is also called Warburg element (ZW = AW/(jω)0.5, where AW is Warburg coefficient, j – imaginary unit, ω – angular frequency). Figure 2 shows an example of EIS spectrum (presented in the Nyquist plot) simulated using the following parameters: RS = 20 Ω, Cdl = 25 μF, Rct = 100 Ω, AW = 300 Ω•s−0.5.In a simple situation, the Warburg element manifests itself in EIS spectra by a line with an angle of 45 degrees in the low frequency region.Values of the charge transfer resistance and Warburg coefficient depend on physico-chemical parameters of a system under investigation. To obtain the Randles circuit parameters, the fitting of the model to the experimental data should be performed using complex nonlinear least-squares procedures available in numerous EIS data fitting computer programs.The Randles equivalent circuit is one of the simplest possible models describing processes at the electrochemical interface. In real electrochemical systems, impedance spectra are usually more complicated and, thus, the Randles circuit may not give appropriate results.".
- Randles_circuit thumbnail Randles_circuit.png?width=300.
- Randles_circuit wikiPageID "12234732".
- Randles_circuit wikiPageLength "2680".
- Randles_circuit wikiPageOutDegree "10".
- Randles_circuit wikiPageRevisionID "646877248".
- Randles_circuit wikiPageWikiLink Category:Analog_circuits.
- Randles_circuit wikiPageWikiLink Charge_transfer_resistance.
- Randles_circuit wikiPageWikiLink Constant_phase_element.
- Randles_circuit wikiPageWikiLink Dielectric_spectroscopy.
- Randles_circuit wikiPageWikiLink Equivalent_circuit.
- Randles_circuit wikiPageWikiLink File:Randles_circuit.png.
- Randles_circuit wikiPageWikiLink File:Randles_spectrum.png.
- Randles_circuit wikiPageWikiLink Nyquist_plot.
- Randles_circuit wikiPageWikiLink Warburg_coefficient.
- Randles_circuit wikiPageWikiLink Warburg_element.
- Randles_circuit wikiPageUsesTemplate Template:Cite_journal.
- Randles_circuit wikiPageUsesTemplate Template:Nofootnotes.
- Randles_circuit subject Category:Analog_circuits.
- Randles_circuit hypernym Circuit.
- Randles_circuit type BaseballLeague.
- Randles_circuit type Circuit.
- Randles_circuit comment "A Randles circuit is an equivalent electrical circuit that consists of an active electrolyte resistance RS in series with the parallel combination of the double-layer capacitance Cdl and an impedance of a faradaic reaction.".
- Randles_circuit label "Randles circuit".
- Randles_circuit sameAs Q7291752.
- Randles_circuit sameAs m.02vwyjb.
- Randles_circuit sameAs Q7291752.
- Randles_circuit wasDerivedFrom Randles_circuit?oldid=646877248.
- Randles_circuit depiction Randles_circuit.png.
- Randles_circuit isPrimaryTopicOf Randles_circuit.
