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

Sanchez, Daniel G and Ortiz, Alfredo and Friedrich, K. Andreas (2013) Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design. ECS Transactions, 58 (1), pp. 209-221. The Electrochemical Society. DOI: 10.1149/05801.0209ecst. ISSN 1938-5862.

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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. 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.

Document Type:Article
Title:Oscillation of PEFC under Low Cathode Humidification: Effect of Gravitation and Bipolar Plate Design
Authors:
AuthorsInstitution or Email of Authors
Sanchez, Daniel GDaniel.GarciaSanchez@dlr.de
Ortiz, AlfredoUniversidad de Cantabria
Friedrich, K. Andreasandreas.friedrich@dlr.de
Date:2013
Journal or Publication Title:ECS Transactions
Refereed publication:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:58
DOI:10.1149/05801.0209ecst
Page Range:pp. 209-221
Publisher:The Electrochemical Society
ISSN:1938-5862
Status:Published
Keywords:Polymer electrolyte, Fuel cell, Water management, Oscillations.
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use
HGF - Program Themes:Fuel Cells
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Electrochemical Energy Technology
Deposited By: Dr Daniel Garcia Sanchez
Deposited On:30 Oct 2013 12:13
Last Modified:30 Oct 2013 12:13

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