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A locally resolved investigation on direct methanol fuel cell uneven components fading: Steady state and degradation local analysis

Rabissi, Claudio and Gazdzicki, Pawel and Guétaz, Laure and Escribano, Silvie and Grahl-Madsen, Laila and Baricci, Andrea and Casalegno, Andrea (2018) A locally resolved investigation on direct methanol fuel cell uneven components fading: Steady state and degradation local analysis. Journal of Power Sources, 397. Elsevier. DOI: 10.1016/j.jpowsour.2018.07.034 ISSN 0378-7753

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Official URL: https://www.sciencedirect.com

Abstract

DMFC technology widespread commercialization is still hindered by durability issues. In literature, locally resolved measurements and post-mortem analyses reveal the onset of strong heterogeneous components fading, higher at air outlet region. Local aging mechanisms could be enhanced by DMFC cathode cycling operation in highly uneven presence of water. An innovative PEM macro-Segmented Fuel Cell (mSFC) setup has been developed to investigate DMFC local performance and degradation, coupling electrochemical and ex-situ analyses as TEM and XPS. An MEA based on highly graphitized carbon supported cathode electrode, confirmed in AST to be stable to cycling operation under flooded conditions, has been implemented in DMFC operation. 500 h local degradation test, despite 32% heterogenenous current density distribution, reveals homogeneous ECSA loss, consistent with homogeneous nanoparticles growth from 3.16 to 5.4 nm, which leads to 70% lower degradation rate (31.2 μV h−1) than the reference MEA. Water-related limitations, such as dehydration and flooding, are revealed to increase local performance loss by 25% and 100% respectively at cathode inlet and outlet regions, leading to current redistribution and uneven voltage loss. Hence, local optimization of MEA properties is foreseen to permit further important durability improvements.

Item URL in elib:https://elib.dlr.de/121056/
Document Type:Article
Title:A locally resolved investigation on direct methanol fuel cell uneven components fading: Steady state and degradation local analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rabissi, ClaudioPolitecnico di MilanoUNSPECIFIED
Gazdzicki, PawelPawel.Gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861
Guétaz, LaureCEAUNSPECIFIED
Escribano, SilvieCEAUNSPECIFIED
Grahl-Madsen, LailaEWIIUNSPECIFIED
Baricci, AndreaPolitecnico di MilanoUNSPECIFIED
Casalegno, AndreaPolitecnico di MilanoUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:397
DOI :10.1016/j.jpowsour.2018.07.034
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:DMFC, Degradation, ex-situ, XPS
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: Gazdzicki, Dr. Pawel
Deposited On:10 Sep 2018 16:44
Last Modified:10 Sep 2018 16:44

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