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EIS characterization – Fuel-Cell – Application Note 32

Latest updated: May 6, 2020

Abstract

The Impedance technique is a powerful tool for investigating the mechanisms of electrochemical reactions occurring on the proton exchange membrane.

In this note, an EIS investigation on a 25 cm2 PEMFC membrane was performed. Impedance settings and the obtained impedance diagrams were presented. The kinetic and the ohmic properties of the membrane were determined using Equivalent circuit Fitting algorithm (Z Fit) available in EC-lab software. The evolution of membrane resistance, charge transfer resistance and mass transport resistance obtained under variable current densities were also studied.

 

Introduction

Electrochemical Impedance Spectroscopy (EIS) investigations are used intensively to complete fuel cell characterizations carried out with common electrochemical techniques (scan or pulse of current or of potential). [1], This can lead to additional information [2-4] such as:

  • reactivity and structure of the interface,
  • electrochemical reactions and mass transport limitation.

The aim of this note is to demonstrate the benefits of the FC-Lab® and FCT series combination for EIS measurements and to analyze EIS data with Zfit (EIS modeling tool) included in EC-Lab® software.

 

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