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  4. Impact of inhomogeneous catalyst layer properties on impedance spectra of polymer electrolyte membrane fuel cells
 
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2015
Journal Article
Title

Impact of inhomogeneous catalyst layer properties on impedance spectra of polymer electrolyte membrane fuel cells

Abstract
A physically-based 1D impedance model of the cathode catalyst layer that accounts for inhomogeneous catalyst layer (CL) properties is developed. The impact of locally changing proton conductivity, volumetric double-layer capacity, ORR rate and effective porosity on the characteristics of impedance spectra is analyzed. It was found that a non-constant conductivity and capacity profile within the CL results in a specific fingerprint in the high frequency range of the spectra where at homogeneous conditions a linear 45° branch would be expected. Furthermore, a well pronounced splitting of a high and low frequency loop can be provoked by introducing non-uniformly distributed CL properties. The simulation results show that electrochemical impedance spectroscopy is a valuable tool to investigate the inhomogeneity of the catalyst layer originated by the electrode preparation itself or by degradation processes.
Author(s)
Gerteisen, Dietmar
Journal
Journal of the Electrochemical Society  
DOI
10.1149/2.0511514jes
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Energietechnik

  • Wasserstoff- und Brennstoffzellentechnologie

  • Brennstoffzellensysteme

  • impedance spectroscopy

  • inhomogeneous catalyst layer property

  • modeling

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