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http://dx.doi.org/10.18419/opus-14458
Autor(en): | Zhang, Qian Schulze, Mathias Gazdzicki, Pawel Friedrich, Kaspar Andreas |
Titel: | Temperature reduction as operando performance recovery procedure for polymer electrolyte membrane fuel cells |
Erscheinungsdatum: | 2024 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 19 |
Erschienen in: | Energies 17 (2024), No. 774 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-144772 http://elib.uni-stuttgart.de/handle/11682/14477 http://dx.doi.org/10.18419/opus-14458 |
ISSN: | 1996-1073 |
Zusammenfassung: | To efficiently mitigate the reversible performance degradation of polymer electrolyte membrane fuel cells, it is crucial to thoroughly understand recovery effects. In this work, the effect of operando performance recovery by temperature reduction is evaluated. The results reveal that operando reduction in cell temperature from 80 °C to 45 °C yields a performance recovery of 60-70% in the current density range below 1 A cm-2 in a shorter time (1.5 h versus 10.5 h), as opposed to a known and more complex non-operando recovery procedure. Notably, the absolute recovered voltage is directly proportional to the total amount of liquid water produced during the temperature reduction. Thus, the recovery effect is likely attributed to a reorganization/rearrangement of the ionomer due to water condensation. Reduction in the charge transfer and mass transfer resistance is observed after the temperature reduction by electrochemical impedance spectroscopy (EIS) measurement. During non-operando temperature reduction (i.e., open circuit voltage (OCV) hold during recovery instead of load cycling) an even higher recovery efficiency of >80% was achieved. |
Enthalten in den Sammlungen: | 04 Fakultät Energie-, Verfahrens- und Biotechnik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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energies-17-00774.pdf | Artikel | 10,41 MB | Adobe PDF | Öffnen/Anzeigen |
energies-17-00774-s001.zip | Supplement | 3,26 MB | Unknown | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons