The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy
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 eq...
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oai:doaj.org-article:3c7bc868f174437f8367b32267924d8e2021-11-11T16:02:26ZThe Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy10.3390/en142172991996-1073https://doaj.org/article/3c7bc868f174437f8367b32267924d8e2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7299https://doaj.org/toc/1996-1073Electrochemical 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<sup>5</sup>–10<sup>−2</sup> 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<sub>mt</sub>) 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.Maximilian GrandiKurt MayerMatija GataloGregor KapunFrancisco Ruiz-ZepedaBernhard MariusMiran GaberščekViktor HackerMDPI AGarticlePEMFCelectrochemical impedance spectroscopyequivalent circuit modellingelectrode designTechnologyTENEnergies, Vol 14, Iss 7299, p 7299 (2021) |
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PEMFC electrochemical impedance spectroscopy equivalent circuit modelling electrode design Technology T |
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PEMFC electrochemical impedance spectroscopy equivalent circuit modelling electrode design Technology T Maximilian Grandi Kurt Mayer Matija Gatalo Gregor Kapun Francisco Ruiz-Zepeda Bernhard Marius Miran Gaberšček Viktor Hacker The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| description |
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<sup>5</sup>–10<sup>−2</sup> 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<sub>mt</sub>) 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. |
| format |
article |
| author |
Maximilian Grandi Kurt Mayer Matija Gatalo Gregor Kapun Francisco Ruiz-Zepeda Bernhard Marius Miran Gaberšček Viktor Hacker |
| author_facet |
Maximilian Grandi Kurt Mayer Matija Gatalo Gregor Kapun Francisco Ruiz-Zepeda Bernhard Marius Miran Gaberšček Viktor Hacker |
| author_sort |
Maximilian Grandi |
| title |
The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| title_short |
The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| title_full |
The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| title_fullStr |
The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| title_full_unstemmed |
The Influence Catalyst Layer Thickness on Resistance Contributions of PEMFC Determined by Electrochemical Impedance Spectroscopy |
| title_sort |
influence catalyst layer thickness on resistance contributions of pemfc determined by electrochemical impedance spectroscopy |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/3c7bc868f174437f8367b32267924d8e |
| work_keys_str_mv |
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| _version_ |
1718432407743365120 |