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Electrochemical impedance spectroscopy as diagnostic tool

Advances in Electrocatalysis, Materials, Diagnostics and Durability

Advanced diagnostics, models and design

High-temperature fuel cells

  1. S. H. Jensen,
  2. J. Hjelm,
  3. A. Hagen,
  4. M. Mogensen

Published Online: 15 DEC 2010

DOI: 10.1002/9780470974001.f500053

Handbook of Fuel Cells

Handbook of Fuel Cells

How to Cite

Jensen, S. H., Hjelm, J., Hagen, A. and Mogensen, M. 2010. Electrochemical impedance spectroscopy as diagnostic tool. Handbook of Fuel Cells. .

Author Information

  1. Technical University of Denmark, Roskilde, Denmark

Publication History

  1. Published Online: 15 DEC 2010

Abstract

The aim of electrochemical impedance spectroscopy (EIS) is to gain knowledge about those processes that contribute to the impedance of an electrochemical system such as a fuel cell or just a single electrode. Usually several processes contribute, and they typically overlap in impedance spectra. This sets a limit to the amount of knowledge that can be derived about the individual processes. First, a brief review of the literature is given. Next, a method to separate individual contributions by systematic variation of operating parameters is described. Only processes depending on the variation contribute to the difference in the impedance. This makes it easier to analyze the difference than the impedance itself. The derivative with respect to ln(frequency) of the real part of the difference of the impedance spectra is easy to obtain and provides a good resolution of the contributions.

Keywords:

  • impedance spectroscopy;
  • analysis of differences in impedance spectra;
  • solid oxide fuel cell;
  • impedance model;
  • equivalent circuit