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Local impact of load cycling on degradation in polymer electrolyte fuel cells

Garcia Sanchez, Daniel and Morawietz, Tobias and Gama da Rocha, Pedro and Hiesgen, Renate and Gazdzicki, Pawel and Friedrich, A.K. (2020) Local impact of load cycling on degradation in polymer electrolyte fuel cells. Applied Energy, 259, p. 114210. Elsevier. doi: 10.1016/j.apenergy.2019.114210. ISSN 0306-2619.

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Abstract

Degradation mechanisms occurring during proton exchange membrane fuel cells (PEMFC) operation critically depend on the applied electrical load profile. In this work, durability tests were performed using different load cycling ranges. The tests include refresh procedures in order to recover temporary performance losses. Operando current density distribution measurements as well as electrochemical characterization techniques were applied to obtain essential data for understanding degradation behavior of the components of the membrane electrode assembly (MEA). The analysis is supported by scanning electron microscopy (SEM) and energy dispersive x-ray diffraction (EDX) analysis of MEA components. Dynamic load cycling has proven to lead to lower performance losses as compared to constant load operation. Moreover, reversible performance losses were associated with an increased heterogeneity of the current density distribution along the flow field. Thereby, areas with high local current density exhibit particularly strong Pt band formation in the membrane linked with a thinning of the cathode catalyst layer.

Item URL in elib:https://elib.dlr.de/135713/
Document Type:Article
Title:Local impact of load cycling on degradation in polymer electrolyte fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Garcia Sanchez, DanielDaniel.GarciaSanchez (at) dlr.deUNSPECIFIED
Morawietz, TobiasTobias.Morawietz (at) dlr.deUNSPECIFIED
Gama da Rocha, PedroUNSPECIFIEDUNSPECIFIED
Hiesgen, RenateHochschule Esslingenhttps://orcid.org/0000-0002-0246-4509
Gazdzicki, PawelPawel.Gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861
Friedrich, A.K.Institute of Engineering Thermodynamics, German Aerospace Center, Pfaffenwaldring 38-40, Stuttgart, 70569, GermanyUNSPECIFIED
Date:2020
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:259
DOI :10.1016/j.apenergy.2019.114210
Page Range:p. 114210
Publisher:Elsevier
ISSN:0306-2619
Status:Published
Keywords:Polymer electrolyte membrane fuel cell Automotive Dynamic load cycling Local degradation Pt band
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) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Garcia Sanchez, Dr Daniel
Deposited On:14 Aug 2020 12:16
Last Modified:14 Sep 2020 16:27

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