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Investigation of in-situ test protocols for accelerated aging of gas diffusion media of PEM fuel cells

Costa e Sousa, Joana Filipa (2019) Investigation of in-situ test protocols for accelerated aging of gas diffusion media of PEM fuel cells. Master's.

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Abstract

In the present work, in-situ accelerated degradation of GDL was investigated using a commercial single cell under different test conditions, based on high potential, mechanical stress and local excess temperature stressors. For each stressor ASTs of approximately 328, 241 and 245 h were performed, respectively. Throughout a test the MEA configuration was changed, with the introduction of a fresh CCM and a fresh cathode GDL to isolate the effect of the cathode GDL. In-situ measurement techniques used to characterize the impact on MEA degradation, include polarization curves, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). To closely examine the cause of degradation roots, CCM samples before and after aging were analyzed by scanning electron microscopy (SEM).

Item URL in elib:https://elib.dlr.de/128202/
Document Type:Thesis (Master's)
Title:Investigation of in-situ test protocols for accelerated aging of gas diffusion media of PEM fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Costa e Sousa, Joana FilipaUNSPECIFIEDUNSPECIFIED
Date:July 2019
Refereed publication:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:58
Status:Submitted
Keywords:PEM fuel cells, gas diffusion layer, membrane electrode assembly, accelerated stress tests, degradation mechanisms
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Aßmann, Pia
Deposited On:12 Jul 2019 13:15
Last Modified:12 Jul 2019 13:15

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