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Atomic Force Microscopy Detection of Electronic Short-Circuits in Solid Polymer Electrolytes Fuel Cell Membranes after Accelerated Degradation

Morawietz, Tobias and Hiesgen, Renate and Helmly, Stefan and Galm, Ines and Friedrich, K. Andreas (2013) Atomic Force Microscopy Detection of Electronic Short-Circuits in Solid Polymer Electrolytes Fuel Cell Membranes after Accelerated Degradation. ECS Transactions, 58 (1), pp. 1085-1096. Electrochemical Society, Inc.. DOI: 10.1149/05801.1085ecst ISSN 1938-5862

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Abstract

In this work we investigated Nafion® 211 polymer electrolyte membranes after 1600 h operation at open circuit voltage. With scanning electron microscopy (SEM) platinum deposition was identified inside the membrane. By investigation of cross sections with Atomic Force Microscopy (AFM) numerous platinum particles and micrometer large two-dimensional sheets of platinum particles were found across the membrane. Conductive AFM was performed to measure the electronic current across the membrane. To avoid additional ionic current contributions the measurements were performed at dry membranes in argon atmosphere with a noncatalytic gold coated AFM tip. At a few sites a steady state electronic current measured through the half cell membranes was detected that had an ohmic current-voltage polarization curve. These electric short-circuit connections, formed by platinum deposition inside the membrane, can be considered as a failure mechanisms for the fuel cell and by enhancement of radical formation may lead to formation of pin-holes.

Item URL in elib:https://elib.dlr.de/85091/
Document Type:Article
Title:Atomic Force Microscopy Detection of Electronic Short-Circuits in Solid Polymer Electrolytes Fuel Cell Membranes after Accelerated Degradation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Morawietz, Tobias Hochschule EsslingenUNSPECIFIED
Hiesgen, RenateHochschule EsslingenUNSPECIFIED
Helmly, Stefanstephan.helmly (at) dlr.deUNSPECIFIED
Galm, InesHochschule EsslingenUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2013
Journal or Publication Title:ECS Transactions
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:58
DOI :10.1149/05801.1085ecst
Page Range:pp. 1085-1096
Publisher:Electrochemical Society, Inc.
ISSN:1938-5862
Status:Published
Keywords:electronic short circuit solid polymer electrolyte accelerated degradation
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:11 Nov 2013 14:59
Last Modified:06 Sep 2019 15:24

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