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Structure, Properties, and Degradation of Ultrathin Ionomer Films in Catalytic Layers of Fuel Cells

Morawietz, Tobias and Handl, Michael and Friedrich, K. Andreas and Hiesgen, Renate (2018) Structure, Properties, and Degradation of Ultrathin Ionomer Films in Catalytic Layers of Fuel Cells. ECS Transactions, 86 (13), pp. 179-191. Electrochemical Society, Inc.. DOI: 10.1149/08613.0179ecst ISSN 1938-5862

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Abstract

The structure of electrodes for proton-exchange membrane fuel cells and electrolysers has an important impact on Performance and degradation. Ionomer films covering Pt/C agglomerates in fuel cell electrodes have a thickness in the range of 4 to 15 nm and differ from the bulk structure with their mostly lamellar films. The formation of such nanothin films deposited by drop-casting and self-assembly was studied by atomic force microscopy. For different equivalent weights and different solvents of Aquivion® and Nafion® dispersions, the size and structure of the Dispersion particles, of sub-monolayers, single and multilayers was investigated on graphene, platinum, mica, and silicon. The size of dispersion particles strongly depends on the solvent. On hydrophobic graphene, the height of ionomer bundles and layers measures 1.5 nm, significantly less than the 2.5 nm height found on hydrophilic Pt, Si, and mica.

Item URL in elib:https://elib.dlr.de/124473/
Document Type:Article
Title:Structure, Properties, and Degradation of Ultrathin Ionomer Films in Catalytic Layers of Fuel Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Handl, MichaelHochschule EsslingenUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Date:July 2018
Journal or Publication Title:ECS Transactions
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:86
DOI :10.1149/08613.0179ecst
Page Range:pp. 179-191
Publisher:Electrochemical Society, Inc.
ISSN:1938-5862
Status:Published
Keywords:Polymer electrolyte fuel cells, Degradation, microstructure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Antriebsstrang (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:19 Dec 2018 17:16
Last Modified:01 Oct 2019 03:00

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