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Optimizing the relative humidity to improve the stability of a proton exchange membrane by segmented fuel cell technology

Lin, Rui and Cao, Chunhui and Ma, Jianxin and Gülzow, Erich and Friedrich, K. Andreas (2012) Optimizing the relative humidity to improve the stability of a proton exchange membrane by segmented fuel cell technology. International Journal of Hydrogen Energy, 37 (4), pp. 3373-3381. Elsevier. DOI: 10.1016/j.ijhydene.2011.11.046 ISSN 0360-3199

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Abstract

The segmented fuel cell technology was applied to investigate the effects of the humidification conditions on the internal locally resolved performance and the stability of the fuel cell system. It was found at certain operating conditions, the time-dependent oscillation of current at potentio-static state appeared. The appearance of positive spikes of current indicated a temporary improved performance, while the negative current spikes indicated a temporary decreased performance. The periodic build-up and removal of liquid water in the cell caused unstable cell performance. Through the analyses of the evolution of the locally resolved current density distributions, the reasons for the positive or the negative spikes of current peaks with respect to a stationary value were found, which might be due to the drying-out of the membrane or the flooding of the membrane. The contour of the current density mapping differed to each other at the period of current peaks up or down, which might be due to different effect of the drying-out or flooding on the membrane. Through optimizing the relative humidity of anode (RHa) or cathode (RHc) of the fuel cell, the oscillation of the current disappeared and the performance of the cell became stable. RHc affects the performance of fuel cell much more obviously than RHa. The stability of the fuel cell system is also dependent on the imposed voltage. With the cell voltage decreased, the amplitude and the frequency of positive spikes of current increased.

Item URL in elib:https://elib.dlr.de/74827/
Document Type:Article
Title:Optimizing the relative humidity to improve the stability of a proton exchange membrane by segmented fuel cell technology
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lin, Ruiruilin (at) tongji.edu.cnUNSPECIFIED
Cao, ChunhuiUNSPECIFIEDUNSPECIFIED
Ma, Jianxinjxma (at) tongji.edu.cnUNSPECIFIED
Gülzow, Ericherich.gülzow (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2012
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:37
DOI :10.1016/j.ijhydene.2011.11.046
Page Range:pp. 3373-3381
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:PEFC, segmented cells, diagnostic proton exchange membrane fuel cell, stability, humidity
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (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: Gülzow, Erich
Deposited On:07 Feb 2012 15:18
Last Modified:10 Jan 2019 15:47

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