EIS: Electrochemical Impedance Spectroscopy Tutorial

by Tutors

Dr. André Weber, Karlsruhe Institute of Technology, Germany

Dr. Dino Klotz, I2CNER, Kyushu University, Fukuoka, Japan

 

Tuesday, 2 July 2019, from 9:30 to 17:00 

Tutorial Language: English

EIS Tutorial Draft Schedule:

09:30 Registration, Welcome Refreshments
10:00 Lecture 1: Fundamentals of Electrochemical Impedance Spectroscopy

10.45 Lecture 2: Evaluation of Impedance Spectra - Kramers-Kronig Test, DRT-Analysis & CNLS Fit

11:30 Coffee break
11.45 Lecture 3: Applications I - Analysis of Materials and Interfaces
12:30 Lecture 4: Applications II - Analysis of PEM Single Cells and Stacks
13:15 Lunch Break
14:45 Lecture 5: Impedance Modelling and Simulation

15.30 Coffee break
15:45 Lecture 6: "EIS challenge" - Summary
17:00 End of EIS Tutorial, opportunity to visit the exhibition
 

EIS Tutorial added values

Electrochemical Impedance Spectroscopy (EIS) has become an important tool for studying mass and charge transport in electrochemical systems. It is not only of importance for fundamental research, but also for characterising batteries, fuel cells, sensors, etc.

The EIS Tutorial contains 5 lectures and an ‘EIS challenge’: The lectures will range from the basic principles of EIS to advanced applications. Next to general issues in impedance measurements, methods to evaluate data quality and to deconvolute the spectra by the distribution of relaxation times will be discussed. Different areas of EIS-applications will be presented, ranging from material analysis to testing of cells and stacks. The  lectures are followed by an ‘EIS challenge’, where all kinds of impedance questions, problems, and latest experiences from the participants can be discussed and exchanged with other participants.

The EIS Tutorial will provide a basic understanding of the technical and physical principles that makes EIS one of the most powerful analysing instruments available today. However the EIS Tutorial is focused on medium to experienced level users, who are already familiar with the principles of fuel cells.

The EIS Tutorial will provide an excellent extension of your current know-how. It will support you with new findings and relevant experiences. You will come into contact with other users and specialists, and can enlarge your exchange and discussion network within the EIS community. During the EIS Tutorial you will receive answers to questions before you have to ask them, as well as the chance to ask questions you may not dare to voice in front of a general audience. Opportunity for discussion and exchange are provided, especially during the ‘EIS challenge’.

Each participant will receive complete documentation of the Tutorial lectures, with many useful illustrations, tables and graphs. 

 

 

The EIS Tutorial will cover the following topics:

Fundamentals of Electrochemical Impedance Spectroscopy

  • impedance measurements 
  • selection of appropriate testing parameters
  • impedance analyzers
  • impact of wiring and cell setup
  • correction and calibration

Evaluation of Impedance Spectra – Kramers-Kronig Test, DRT-Analysis & CNLS-Fit

  • validating impedance data quality
  • Distribution of Relaxation Times (DRT)
  • CNLS-fit

Applications I - Analysis of Materials and Interfaces

  • electrolyte conductivity – impact of humidity and temperature
  • single electrode measurements – ideal counter electrode, symmetrical cell or reference electrode
  • high resistance model electrodes
  • high performance electrodes
  • impedance of further interfaces

Applications II - Analysis of PEM Single Cells and Stacks

  • test bench design
  • humidity and liquid water
  • single cells, repeat units and stacks

Impedance Modeling and Simulation

  • electrochemical processes and their operating parameter dependencies
  • deconvolution of electrode processes
  • from AC-impedance to DC-performance