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A locally resolved investigation on direct methanol fuel cell uneven components fading: Local cathode catalyst layer tuning for homogeneous operation and reduced degradation rate

Rabissi, Claudio and Zago, Matteo and Gazdzicki, Pawel and Guétaz, Laure and Escribano, Silvie and Grahl-Madsen, Laila and Casalegno, Andrea (2018) A locally resolved investigation on direct methanol fuel cell uneven components fading: Local cathode catalyst layer tuning for homogeneous operation and reduced degradation rate. Journal of Power Sources, 404, pp. 135-148. Elsevier. DOI: 10.1016/j.jpowsour.2018.09.094 ISSN 0378-7753

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Official URL: https://www.sciencedirect.com/science/article/pii/S0378775318310735?dgcid=author

Abstract

Durability issues of direct methanol fuel cell still hinder technology widespread commercialization; uneven aging of MEA components, generally harsher in air outlet region, is known to exasperate overall performance degradation. In a previous work, the authors selected a stable cathode electrode, demonstrated to fade homogenously: uneven water-related limitations, such as dehydration and flooding, were revealed to locally worsen performance at cathode inlet and outlet regions, leading to current redistribution. Aiming to reduce degradation rate, in this work homogeneous current distribution during operation is pursued by tuning MEA properties to meet local operating conditions. A properly improved 1D+1D physical model is used to support the development of a gradient MEA, featuring 1.6 mg cm−2 and 0.8 mg cm−2 of catalyst and ionomer respectively at inlet/ outlet and center regions of cathode electrode. Tests based on custom macro-segmented cell demonstrated 55% more homogeneous current distribution, controllable during operation by means of cathode air stoichiometry. 500 h degradation test revealed 70% decreased degradation rate from uniform MEA (11 μV h−1) with a homogenous fading of performance. An 18% lower Pt nanoparticle growth at cathode outlet and limited ionomer degradation at cathode inlet were identifed by ex-situ analyses (TEM and XPS), indicating locally mitigated fading mechanisms.

Item URL in elib:https://elib.dlr.de/122346/
Document Type:Article
Title:A locally resolved investigation on direct methanol fuel cell uneven components fading: Local cathode catalyst layer tuning for homogeneous operation and reduced degradation rate
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rabissi, ClaudioPolitecnico di MilanoUNSPECIFIED
Zago, MatteoPolitecnico di MilanoUNSPECIFIED
Gazdzicki, PawelPawel.Gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861
Guétaz, LaureCEAUNSPECIFIED
Escribano, SilvieCEAUNSPECIFIED
Grahl-Madsen, LailaEWIIUNSPECIFIED
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:404
DOI :10.1016/j.jpowsour.2018.09.094
Page Range:pp. 135-148
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:DMFC, Degradation, Ex-situ Analysis
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 Dec 2018 14:56
Last Modified:10 Dec 2018 14:56

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