| Publikationstyp: | Konferenz: Paper |
| Art der Begutachtung: | Editorial review |
| Titel: | Investigation of the cathode active layer of PEM fuel cells using AC impedance spectroscopy |
| Autor/-in: | Gerteisen, Dietmar Hakenjos, Alexander Schumacher, Jürgen |
| Tagungsband: | 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland |
| Band(Heft): | 1 |
| Seite(n): | 271 |
| Seiten bis: | 282 |
| Angaben zur Konferenz: | 2nd European Polymer Eletrolyte Fuel Cell (PEFC) Forum, Lucerne, 30 June - 4 July 2003 |
| Erscheinungsdatum: | 2003 |
| Verlag / Hrsg. Institution: | European Fuel Cell Forum |
| ISBN: | 3-905592-13-4 |
| Sprache: | Englisch |
| Schlagwörter: | Pefc; Fuel cells; Ac impedance spectroscopy |
| Fachgebiet (DDC): | 621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnik |
| Zusammenfassung: | This paper presents the characterisation of the cathode electrode of proton exchange membrane (PEM) fuel cells by means of AC impedance spectroscopy. Measured steady-state voltammograms and impedance spectra are compared to simulation results obtained with two different models for the cathode electrode. A test fuel cell with an active area of 1.4x1.4 cm^2 and meander-shaped flow-fields is used for the measurements. The cell temperature can be controlled. Measured steadystate voltammograms in the region of low overpotential show a change in the Tafel slope. The radius of the measured AC impedance arc decreases with increasing overvoltage, shows a minimum value and subsequently grows again as the overpotential increases. This is interpreted as mass transport limitation of oxygen. Two mathematical models for the simulation of AC impedance spectra and polarisation curves are investigated. The multi-step model is based on two electrochemical steps for the oxygen reduction reaction (ORR) mechanism. A second model accounts for oxygen transport limitation in spherical agglomerates. It is assumed that in the catalyst layer the dispersed catalyst (Pt/C) forms agglomerated zones filled with the electrolyte. The measured polarisation curves can be fitted both by the multi-step model and the agglomerate model. The quantitative impedance values are reproduced by the multi-step model. However, it does not reproduce the oxygen transport limitation which is observed experimentally. This feature of the impedance spectra is captured by the agglomerate model. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/11810 |
| Volltext Version: | Publizierte Version |
| Lizenz (gemäss Verlagsvertrag): | Lizenz gemäss Verlagsvertrag |
| Departement: | School of Engineering |
| Organisationseinheit: | Institute of Computational Physics (ICP) |
| Enthalten in den Sammlungen: | Publikationen School of Engineering |
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Gerteisen, D., Hakenjos, A., & Schumacher, J. (2003). Investigation of the cathode active layer of PEM fuel cells using AC impedance spectroscopy [Conference paper]. 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland, 1, 271–282.
Gerteisen, D., Hakenjos, A. and Schumacher, J. (2003) ‘Investigation of the cathode active layer of PEM fuel cells using AC impedance spectroscopy’, in 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland. European Fuel Cell Forum, pp. 271–282.
D. Gerteisen, A. Hakenjos, and J. Schumacher, “Investigation of the cathode active layer of PEM fuel cells using AC impedance spectroscopy,” in 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland, 2003, vol. 1, pp. 271–282.
GERTEISEN, Dietmar, Alexander HAKENJOS und Jürgen SCHUMACHER, 2003. Investigation of the cathode active layer of PEM fuel cells using AC impedance spectroscopy. In: 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland. Conference paper. European Fuel Cell Forum. 2003. S. 271–282. ISBN 3-905592-13-4
Gerteisen, Dietmar, Alexander Hakenjos, and Jürgen Schumacher. 2003. “Investigation of the Cathode Active Layer of PEM Fuel Cells Using AC Impedance Spectroscopy.” Conference paper. In 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland, 1:271–82. European Fuel Cell Forum.
Gerteisen, Dietmar, et al. “Investigation of the Cathode Active Layer of PEM Fuel Cells Using AC Impedance Spectroscopy.” 2nd European PEFC Forum 2003. Proceedings. Vol.1 : 30 June - 4 July 2003, Lucerne, Switzerland, vol. 1, European Fuel Cell Forum, 2003, pp. 271–82.
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