Stahl, Peter und Biesdorf, Jan und Boillat, Pierre und Friedrich, K. Andreas (2016) An Investigation of PEFC Sub-Zero Startup: Evidence of Local Freezing Effects. Journal of The Electrochemical Society, 163 (14), F1535-F1542. Electrochemical Society, Inc.. doi: 10.1149/2.0771614jes. ISSN 0013-4651.
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Kurzfassung
Starting PEFCs from sub-zero temperatures can be challenging as generated product water runs the risk to freeze, causing cell failure by blocking the gas pathways for the reactant gases in the porous layers. Hence a fundamental understanding of the cell failure mechanisms is essential to enable robust system functionalities even at temperatures far below 0◦C. In this work we set a focus on analysis of water transport processes during isothermal startup at temperatures between −10 and −2.5◦C. Neutron radiography was applied in order to analyze spatial heterogeneities of water production during a cold start and also to verify phase transitions from water to ice. The latter was facilitated by a recently developed dual spectrum neutron radiography method, which was applied for the first time to a 50 cm2 test cell. Our results reveal that at −5◦C and above freezing can occur in a limited region while the rest of the cell continues generating liquid product water. But as temperature is shifted downwards, water distribution tends to be more uniform and freezing mechanisms seem to proceed more homogeneously over the cell plane.
elib-URL des Eintrags: | https://elib.dlr.de/109363/ | ||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
Titel: | An Investigation of PEFC Sub-Zero Startup: Evidence of Local Freezing Effects | ||||||||||||||||||||
Autoren: |
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Datum: | 2016 | ||||||||||||||||||||
Erschienen in: | Journal of The Electrochemical Society | ||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||
Band: | 163 | ||||||||||||||||||||
DOI: | 10.1149/2.0771614jes | ||||||||||||||||||||
Seitenbereich: | F1535-F1542 | ||||||||||||||||||||
Verlag: | Electrochemical Society, Inc. | ||||||||||||||||||||
ISSN: | 0013-4651 | ||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||
Stichwörter: | polymer electrolyte fuel cell cold start freezing | ||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||
HGF - Programm: | Speicher und vernetzte Infrastrukturen | ||||||||||||||||||||
HGF - Programmthema: | Brennstoffzellen | ||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||
DLR - Forschungsgebiet: | E EV - Energieverfahrenstechnik | ||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Prozesse (Brennstoffzellen) (alt) | ||||||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Elektrochemische Energietechnik | ||||||||||||||||||||
Hinterlegt von: | Friedrich, Prof.Dr. Kaspar Andreas | ||||||||||||||||||||
Hinterlegt am: | 19 Dez 2016 15:30 | ||||||||||||||||||||
Letzte Änderung: | 22 Jun 2023 10:23 |
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