Friedrich, K. Andreas and Garcia Sanchez, Daniel and Ortiz, Alfredo (2013) Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design. In: ECS Transactions. 224th ECS Meeting, 2013-10-27 - 2013-11-01, San Fransisco, USA. doi: 10.1149/05801.0209ecst. ISBN 978-160768539-5. ISSN 1938-6737.
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Abstract
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 a 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 before and several new aspects are investigated. Oscillations are present under both galvanostatic and potentiostatic conditions and it is shown that the transitions involve local membrane drying by 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 influences the liquid water distribution in the anodic flow channels and thus it is also affecting the oscillatory behavior of the cell performance. Comparing cell performance oscillations with a five channel serpentine flow field to a cell with one channel serpentine it is found that the oscillating performance behavior is also influenced by the gas velocity within an anodic flow channel.
Item URL in elib: | https://elib.dlr.de/85708/ | ||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||
Title: | Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design | ||||||||||||||||
Authors: |
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Date: | 29 October 2013 | ||||||||||||||||
Journal or Publication Title: | ECS Transactions | ||||||||||||||||
Refereed publication: | No | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||
DOI: | 10.1149/05801.0209ecst | ||||||||||||||||
ISSN: | 1938-6737 | ||||||||||||||||
ISBN: | 978-160768539-5 | ||||||||||||||||
Status: | Published | ||||||||||||||||
Keywords: | oscillation polymer electrolyte fuel cells gravitation | ||||||||||||||||
Event Title: | 224th ECS Meeting | ||||||||||||||||
Event Location: | San Fransisco, USA | ||||||||||||||||
Event Type: | international Conference | ||||||||||||||||
Event Start Date: | 27 October 2013 | ||||||||||||||||
Event End Date: | 1 November 2013 | ||||||||||||||||
HGF - Research field: | Energy | ||||||||||||||||
HGF - Program: | Efficient Energy Conversion and Use (old) | ||||||||||||||||
HGF - Program Themes: | Fuel Cells (old) | ||||||||||||||||
DLR - Research area: | Energy | ||||||||||||||||
DLR - Program: | E EV - Energy process technology | ||||||||||||||||
DLR - Research theme (Project): | E - Elektrochemische Prozesse (old) | ||||||||||||||||
Location: | Stuttgart | ||||||||||||||||
Institutes and Institutions: | Institute of Engineering Thermodynamics > Electrochemical Energy Technology | ||||||||||||||||
Deposited By: | Friedrich, Prof.Dr. Kaspar Andreas | ||||||||||||||||
Deposited On: | 26 Nov 2013 10:39 | ||||||||||||||||
Last Modified: | 17 Oct 2024 15:01 |
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