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The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy

Author

Listed:
  • Maximilian Grandi

    (Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25/C, 8010 Graz, Austria)

  • Kurt Mayer

    (Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25/C, 8010 Graz, Austria)

  • Matija Gatalo

    (Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia)

  • Gregor Kapun

    (Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia)

  • Francisco Ruiz-Zepeda

    (Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia)

  • Bernhard Marius

    (Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25/C, 8010 Graz, Austria)

  • Miran Gaberšček

    (Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, 1001 Ljubljana, Slovenia)

  • Viktor Hacker

    (Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25/C, 8010 Graz, Austria)

Abstract

Electrochemical impedance spectroscopy is an important tool for fuel-cell analysis and monitoring. This study focuses on the low-AC frequencies (2–0.1 Hz) to show that the thickness of the catalyst layer significantly influences the overall resistance of the cell. By combining known models, a new equivalent circuit model was generated. The new model is able to simulate the impedance signal in the complete frequency spectrum of 10 5 –10 −2 Hz, usually used in experimental work on polymer electrolyte fuel cells (PEMFCs). The model was compared with experimental data and to an older model from the literature for verification. The electrochemical impedance spectra recorded on different MEAs with cathode catalyst layer thicknesses of approx. 5 and 12 µm show the appearance of a third semicircle in the low-frequency region that scales with current density. It has been shown that the ohmic resistance contribution (R mt ) of this third semicircle increases with the catalyst layer’s thickness. Furthermore, the electrolyte resistance is shown to decrease with increasing catalyst-layer thickness. The cause of this phenomenon was identified to be increased water retention by thicker catalyst layers.

Suggested Citation

  • Maximilian Grandi & Kurt Mayer & Matija Gatalo & Gregor Kapun & Francisco Ruiz-Zepeda & Bernhard Marius & Miran Gaberšček & Viktor Hacker, 2021. "The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy," Energies, MDPI, vol. 14(21), pages 1-18, November.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7299-:d:671740
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    References listed on IDEAS

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    1. Walter Zamboni & Giovanni Petrone & Giovanni Spagnuolo & Davide Beretta, 2019. "An Evolutionary Computation Approach for the Online/On-Board Identification of PEM Fuel Cell Impedance Parameters with A Diagnostic Perspective," Energies, MDPI, vol. 12(22), pages 1-19, November.
    2. David A. Cullen & K. C. Neyerlin & Rajesh K. Ahluwalia & Rangachary Mukundan & Karren L. More & Rodney L. Borup & Adam Z. Weber & Deborah J. Myers & Ahmet Kusoglu, 2021. "New roads and challenges for fuel cells in heavy-duty transportation," Nature Energy, Nature, vol. 6(5), pages 462-474, May.
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    Cited by:

    1. Michaela Roschger & Sigrid Wolf & Boštjan Genorio & Viktor Hacker, 2022. "Effect of PdNiBi Metal Content: Cost Reduction in Alkaline Direct Ethanol Fuel Cells," Sustainability, MDPI, vol. 14(22), pages 1-15, November.
    2. Mario Kircher & Michaela Roschger & Wai Yee Koo & Fabio Blaschke & Maximilian Grandi & Merit Bodner & Viktor Hacker, 2023. "Effects of Catalyst Ink Storage on Polymer Electrolyte Fuel Cells," Energies, MDPI, vol. 16(19), pages 1-20, October.

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