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

Daniel, G. Sanchez and Alfredo, Ortiz and 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), pp. 636-644. Electrochemical Society, Inc.. DOI: [ 10.1149/2.091306jes] ISSN 0013-4651

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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 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.

Item URL in elib:https://elib.dlr.de/84448/
Document Type:Article
Title:Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Daniel, G. SanchezDaniel.garciaSanchez (at) dlr.deUNSPECIFIED
Alfredo, OrtizUniversidad de Cantabria, Santander, SpainUNSPECIFIED
K. Andreas, Friedrichandreas.friedrich (at) dlr.deUNSPECIFIED
Date:4 April 2013
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:160
DOI :[ 10.1149/2.091306jes]
Page Range:pp. 636-644
Publisher:Electrochemical Society, Inc.
ISSN:0013-4651
Status:Published
Keywords:Polymer electrolyte, fuel cell, water management, oscillations.
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: Garcia Sanchez, Dr Daniel
Deposited On:09 Oct 2013 09:46
Last Modified:31 Jul 2019 19:42

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