Garcia Sanchez, Daniel und Alfredo, Ortiz und K. Andreas, Friedrich (2013) Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design. Journal of The Electrochemical Society, 160 (6), Seiten 636-644. Electrochemical Society, Inc.. doi: 10.1149/2.091306jes. ISSN 0013-4651.
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Kurzfassung
Oscillatory fluctuations of a single proton exchange membrane fuel cell appear upon operation with a dry cathode air supply and a fully humidified anode stream. Periodic transitions between a low- and high-current operation point of the oscillating state due to the balance of drying and wetting processes in combination with water transport have been observed previously; however, several new aspects have been investigated in the present study, providing insight into the initiation processes. Oscillations are present under both galvanostatic and potentiostatic conditions, and it is demonstrated that the transitions involve local membrane drying through the comparison of impedance data with current density distributions. The oscillations are caused by periodic flow type changes from one- to two-phase flow in the anodic channels of the flow field. It has been observed that cell orientation with respect to Earth’s gravity field affects the liquid water distribution in the anodic flow channels and, thus, also affects the oscillatory behavior of the cell performance. When comparing cell performance oscillations with a five-channel serpentine flow field to a cell with a one-channel serpentine flow field, the oscillating performance behavior is observed to also be affected by the gas velocity within an anodic flow channel.
elib-URL des Eintrags: | https://elib.dlr.de/84448/ | ||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||
Titel: | Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design | ||||||||||||||||
Autoren: |
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Datum: | 4 April 2013 | ||||||||||||||||
Erschienen in: | Journal of The Electrochemical Society | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Ja | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||
Band: | 160 | ||||||||||||||||
DOI: | 10.1149/2.091306jes | ||||||||||||||||
Seitenbereich: | Seiten 636-644 | ||||||||||||||||
Verlag: | Electrochemical Society, Inc. | ||||||||||||||||
ISSN: | 0013-4651 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | Polymer electrolyte, fuel cell, water management, oscillations. | ||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||
HGF - Programm: | Rationelle Energieumwandlung und Nutzung (alt) | ||||||||||||||||
HGF - Programmthema: | Brennstoffzelle (alt) | ||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||
DLR - Forschungsgebiet: | E EV - Energieverfahrenstechnik | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Elektrochemische Prozesse (alt) | ||||||||||||||||
Standort: | Stuttgart | ||||||||||||||||
Institute & Einrichtungen: | Institut für Technische Thermodynamik > Elektrochemische Energietechnik | ||||||||||||||||
Hinterlegt von: | Garcia Sanchez, Dr Daniel | ||||||||||||||||
Hinterlegt am: | 09 Okt 2013 09:46 | ||||||||||||||||
Letzte Änderung: | 29 Nov 2023 12:57 |
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