Impedance Analysis of Electrochemical Systems

Abstract

Interpretation of impedance spectroscopy data requires both a description of the chemistry and physics that govern the system and an assessment of the error structure of the measurement. The approach presented here includes use of graphical methods to guide model development, use of a measurement model analysis to assess the presence of stochastic and bias errors, and a systematic development of interpretation models in terms of the proposed reaction mechanism and physical description. Application to corrosion, batteries, and biological systems is discussed, and emerging trends in interpretation and implementation of impedance spectroscopy are presented.

Selective Photocatalytic Dehydrogenation of Formic Acid by an In Situ-Restructured Copper-Postmetalated Metal–Organic Framework under Visible Light

“…Furthermore, electrochemical impedance spectroscopy (EIS) was employed to gain insight about the CT resistance and the response of the system under various frequency regimes. 65 UiO-66-(COOH) 2 -Cu shows smaller CT resistance than UiO-66-(COOH) 2 (Figure S14B), which confirms the enhanced conductivity and better electron mobility in UiO-66-(COOH) 2 -Cu.…”

“…0.129, 0.015, and −0.643 V vs Ag/AgCl, which could be attributed to the redox reactions of copper species inserted into two different coordination sites, the free carboxylate and the defective Zr cluster. , UiO-66-(COOH) 2 -Cu shows a higher voltammetric current than UiO-66-(COOH) 2 , indicating a higher conductivity and improved electron/ion mobility. Furthermore, electrochemical impedance spectroscopy (EIS) was employed to gain insight about the CT resistance and the response of the system under various frequency regimes . UiO-66-(COOH) 2 -Cu shows smaller CT resistance than UiO-66-(COOH) 2 (Figure S14B), which confirms the enhanced conductivity and better electron mobility in UiO-66-(COOH) 2 -Cu.…”

Ionic Liquid-Functionalized ZrO2/Reduced Graphene Oxide Nanocomposites for Carcinoembryonic Antigen Electrochemical Detection

“…To measure the interfacial property of the electroactive materials of the electrode surface, the EIS technique (Nyquist plot and Bode plot) has been employed . In the Nyquist plot, the semi-circle part that shows the kinetically controlled reaction is equal to the charge transfer resistance ( R CT ) of the modified electrode, while the straight line is for the diffusion control reaction (Warburg impedance). , Figure B shows the Nyquist plot ( Z real vs Z imag ) of the modified electrodes in the frequency range of 0.1–10 5 Hz. The calculated R CT value of the GCE is 5386 Ω.…”

Glassy Carbon Substrate Oxidation Effects on Electrode Stability for Oxygen Evolution Reaction Catalysis Stability Benchmarking

“…Series resistance values varied from 16 to 22 Ω. The EIS spectra collected throughout stability testing were fit using the Zfit feature through Biologic’s EC Lab software, employing a modified Randles circuit to extract the key parameter of electrode charge transfer resistance. , The equivalent circuit selected to fit the data uses a constant phase element instead of a Warburg element to achieve an optimal fit for data at low frequencies (Figure E). A similar circuit with a resistor and capacitor in series (instead of a Warburg element) is commonly used in the literature to fit impedance spectroscopy of similar electrodes. − …”