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Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design

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. 224th ECS Meeting, 27.10-1.11.2013, San Fransisco, USA.

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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/
Document Type:Conference or Workshop Item (Speech)
Title:Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Garcia Sanchez, DanielDaniel.GarciaSanchez (at) dlr.deUNSPECIFIED
Ortiz, AlfredoUniversidad de CantabriaUNSPECIFIED
Date:29 October 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:oscillation polymer electrolyte fuel cells gravitation
Event Title:224th ECS Meeting
Event Location:San Fransisco, USA
Event Type:international Conference
Event Dates:27.10-1.11.2013
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:01 Dec 2018 19:49

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