Electrochemical impedance Spectroscopy the complete guide in 2020

  • Course level: Beginner
  • Categories C-Science
  • Last Update 23/06/2021


Electrochemical impedance Spectroscopy

This course will introduce the electrochemical impedance spectroscopy technique and illustrate its use to characterize electrochemical processes. Details regarding the correct method of data acquisition and analysis, along with pitfalls to watch out for, will be discussed.

Week 1:  Introduction to electrochemistry, electrode-electrolyte interface, reference electrode, three-electrode cell, supporting electrolyte, the rate constant, EIS basics, electrical elements, differential impedance, time-domain results, graphical representation of impedance data in Bode and Complex plane plots, other techniques.

Week 2:   Experimental details: Instrumentation, single and multi-sine inputs, FFT details, frequency range and resolution, cross-correlation, multi sine: odd harmonics and non-harmonic choices, crest factor, spectral leakage, windowing

Week 3: Data validation: Kramers Kronig Transforms (KKT), Linearity, causality, stability, impedance vs. admittance, applications, and limitations, Alternatives – measurement model analysis and linear KKT

Week 4:  Data analysis: Electrical Equivalent Circuits, choice of circuits, confidence intervals, AIC, initial values, distinguishability, zeros and poles representation, charge transfer resistance and polarization resistance, Maxwell, Ladder, and Voigt circuits

Week 5:  Reaction mechanism analysis, linearization of governing equations, derivation of impedance expression for a simple electron transfer reaction; two-step reactions with one adsorbed intermediate

Week 6:  Reaction mechanism analysis (continued), development of impedance expression for multiple reactions, an example reaction exhibiting negative resistance, an example three-step reaction with 2 adsorbed intermediates

Week 7:  Reaction mechanism analysis (continued), development of impedance expression for a catalytic reaction exhibiting negative resistance, reactions with Frumkin isotherm practical challenges in the extraction of kinetic information, list of various patterns of complex plane plots reported in the literature

Week 8:  Diffusion effects, Warburg Impedance, finite and semi-infinite cases, effect of change in dc potential, and boundary layer thickness.

Week 9:  Constant phase elements (CPE), porous electrodes

Week 10:  Passivation and film formation, point defect model (PDM), and extensions. Description of a few selected applications of EIS: Corrosion, biosensors, fuel cells, mechanistic analysis

Week 11:  Nonlinear EIS (NLEIS), introduction, mathematical background (Taylor series, Fourier series, modified Bessel functions), NLEIS for a simple electron transfer reaction, reaction with adsorbed intermediates, Nonlinear charge transfer, and polarization resistances

Week 12:  Effect of instabilities in traditional EIS- calculation using NLEIS methodology, solution resistance effects, Detection of nonlinearities using KKT, NLEIS with Frumkin and Temkin isotherm, evaluation of related technique: electrochemical frequency modulation (EFM)


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Topics for this course

56 Lessons

Electrochemical impedance Spectroscopy

Introduction to Electrochemical impedance Spectroscopy00:00:00
Detailed Syllabus00:00:00
Electrochemistry, double layer, 3 electrode systems, supporting electrolyte00:00:00
Rate constant, concept of impedance, Z of electrical elements, differential impedance00:00:00
Time domain results00:00:00
Graphical representation of data (Complex plane, Bode)00:00:00
Introduction to other techniques00:00:00
Assignment 0100:00:00
Porous electrodes00:00:00
Films, PDM00:00:00
Bounded Warburg00:00:00
Patterns reported in experiments00:00:00
Challenges in RMA00:00:00
Catalytic mechanism.00:00:00
Simple electron transfer reaction00:00:00
Two step reaction with an intermediate (1 of 3)00:00:00
Two step reaction with an intermediate (2 of 3)00:00:00
Two step reaction with an intermediate (3 of 3)00:00:00
Examples with Frumkin or Temkin isotherms00:00:00
E-EAR reaction, negative resistance (1 of 2)00:00:00
E-EAR reaction, negative resistance (2 of 2)00:00:00
Three step reaction with two adsorbed intermediates00:00:00
Assignment 0400:00:00
Maxwell, Voigt, Ladder circuits, choice of initial values illustrated00:00:00
Zero/pole representation, Rt and Rp00:00:00
EEC fitting, initial values, distinguishability00:00:00
Introduction to EEC, Choice of circuits, confidence intervals, AIC00:00:00
Assignment 0300:00:00
Introduction to KKT00:00:00
Linearity, causality, stability, impedance vs. admittance, measurement model00:00:00
Linear KKT illustration00:00:00
Assignment 0200:00:00
Type of analyzers, single and multi sine00:00:00
FFT details, frequency range and resolution, cross correlation00:00:00
Multi sine, odd harmonic, non-harmonics, crest factor, spectral leakage00:00:00
NLEIS. Introduction and mathematical background00:00:00
Electron Transfer reaction00:00:00
Two step reaction00:00:00
Two step reaction (continued)00:00:00
Rt and Rp estimation00:00:00
Galvanostatic simulations00:00:00
Solution resistance effects00:00:00
Detection on nonlinearities using KKT00:00:00
Frumkin and Temkin isotherms00:00:00
NLEIS Experimental aspects. FFT, PSD, THD00:00:00
Application – other techniques HA, EFM00:00:00
Answers to Assignments – 01 TO 0400:00:00
Answers to Assignments – 05 TO 0800:00:00

Enrolment validity: Lifetime


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