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  • Primer
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Electrochemical impedance spectroscopy

Abstract

Electrochemical impedance spectroscopy (EIS) is a powerful tool to investigate properties of materials and electrode reactions. This Primer provides a guide to the use of EIS and a comparison with other electrochemical techniques. The analysis of impedance data for reduction of ferricyanide in a KCl supporting electrolyte is used to demonstrate the error structure for impedance measurements, the use of measurement and process models, and the sensitivity of impedance to the evolution of electrode properties. This Primer provides guidelines for experimental design, discusses the relevance of accuracy contour plots to wiring and instrumentation selection, and emphasizes the importance of the Kramers–Kronig relations to data validation and analysis. Applications of EIS to battery performance, metal and alloy corrosion, and electrochemical biosensors are highlighted. Electrochemical impedance measurements depend on both the mechanism under investigation and extrinsic parameters, such as the electrode geometry. Experimental complications are discussed, including the influence of non-stationary behaviour at low frequencies and the need for reference electrodes. Finally, emerging trends in experimental and interpretation approaches are also described.

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Fig. 1: Required steps to acquire an EIS measurement.
Fig. 2: Guidelines for EIS measurements.
Fig. 3: EIS data of an ideally polarizable electrode obtained for a redox couple in solution.
Fig. 4: Sample analysis of impedance data.
Fig. 5: Typical EIS spectra and the corresponding physical processes.
Fig. 6: Use of EIS measurements at different temperatures to extract activation energy.
Fig. 7: Use of EIS to detect the concentration of breast cancer cells.
Fig. 8: Influence of pore size distribution on impedance behaviour.
Fig. 9: Measurement model analysis to identify the error structure of impedance data.

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Authors and Affiliations

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Contributions

Introduction (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Experimentation (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Results (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Applications (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Reproducibility and data deposition (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Limitations and optimizations (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Outlook (S.W., J.Z., O.G., V.V., M.G. and M.E.O); Overview of the Primer (M.E.O.).

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Correspondence to Mark E. Orazem.

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Glossary

Cyclic voltammetry

An electrochemical technique in which the current response of an electrochemical system is measured as a function of the potential, which is swept in positive and negative directions at a given rate.

Chronoamperometry

An electrochemical technique in which a potential step is applied to a working electrode and the current response is recorded as a function of time.

Chronopotentiometry

An electrochemical technique in which a current step is applied to a working electrode and the potential response is recorded as a function of time.

Scanning electrochemical microscopy

A local electrochemical technique that allows sensing of the surface topography and reactivity.

Interfacial capacitance

The capacity of the electrical double layer or the double layer in series with a thin film on the electrode surface (measured in farads per square metre).

Potentiostat

Electronic hardware for electrochemical experiments maintaining a constant potential difference between the working electrode and the reference electrode.

Rotating disk electrode

A set-up allowing control of the rotation rate of a disk electrode embedded in an insulating circular plane in order to enhance and tune mass transport by generating a thin diffusion layer with uniform thickness.

Complex number

An ordered pair of real and imaginary numbers.

Resistance

The real part of the impedance of an electrical circuit (measured in ohm square metres).

Reactance

The imaginary part of the impedance of an electrical circuit (measured in ohm square metres).

Ohmic resistance

An ionic resistance of the electrolyte and electronic resistance of the electrode, wire and connection (measured in ohm square metres).

Capacitance

The ability of the electrochemical system, specifically the electrode–electrolyte interface, to hold electrical charge (measured in farads per square metre).

Frequency decade

A unit for measuring frequency ratios on a logarithmic scale, with one decade corresponding to a ratio of ten between two frequencies (an order of magnitude difference).

Oscilloscope

Electronic hardware monitoring the time-domain signals that are processed in the impedance measurement (for example, Lissajous plot).

Warburg semi-infinite diffusion impedance

An impedance element describing the diffusion behaviour of the electrolyte in the absence of convection with a diffusion layer that can spread to infinity.

Simplex regression

A robust mathematical algorithm used to solve non-linear least-squares curve-fitting problems that is less sensitive to initial values but does not provide confidence intervals for the resulting parameter estimates.

Levenberg–Marquardt regression

A mathematical algorithm used to solve non-linear least-squares curve-fitting problems that is sensitive to initial values and provides confidence intervals for the resulting parameter estimates.

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Wang, S., Zhang, J., Gharbi, O. et al. Electrochemical impedance spectroscopy. Nat Rev Methods Primers 1, 41 (2021). https://doi.org/10.1038/s43586-021-00039-w

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