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dc.contributor.author
Halter, J.
dc.contributor.author
Marone, Federica
dc.contributor.author
Schmidt, Thomas J.
dc.contributor.author
Büchi, Felix N.
dc.date.accessioned
2018-11-27T12:15:39Z
dc.date.available
2018-11-09T04:56:09Z
dc.date.available
2018-11-27T12:15:39Z
dc.date.issued
2018
dc.identifier.issn
0013-4651
dc.identifier.issn
1945-7111
dc.identifier.other
10.1149/2.0501814jes
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/302182
dc.identifier.doi
10.3929/ethz-b-000302182
dc.description.abstract
In high temperature polymer electrolyte fuel cells, at high current densities, phosphoric acid (PA) migrates toward the anode and invades catalyst, microporous and gas diffusion layers (GDL). This work studies this PA redistribution using synchrotron based operando X-Ray tomographic microscopy (XTM) and electrochemical impedance spectroscopy (EIS) during a current cycling protocol. It is shown that under reformate conditions, during the first 2 minutes after a positive current step, the cell voltage increases due to better wetting of the anode catalyst layer (CL). From 2 to 20 minutes, the cell voltage drops due to increasing mass transport losses in the microporous layer (MPL) and the GDL. At the anode, cracks in MPL and CL, both with widths up to 150 μm, are flooded within 2 minutes after a current density increase. Acid flooding is only observed for MPL cracks that overlap with CL cracks. The CL cracks therefore act as injection points for the flooding of the MPL cracks and the gas diffusion layer. No change in the PA content of any of the cathodic porous components was observed.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Electrochemical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.title
Breaking through the Cracks: On the Mechanism of Phosphoric Acid Migration in High Temperature Polymer Electrolyte Fuel Cells
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2018-10-25
ethz.journal.title
Journal of the Electrochemical Society
ethz.journal.volume
165
en_US
ethz.journal.issue
14
en_US
ethz.journal.abbreviated
J. Electrochem. Soc.
ethz.pages.start
F1176
en_US
ethz.pages.end
F1183
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.publication.place
New York, NY
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02020 - Dep. Chemie und Angewandte Biowiss. / Dep. of Chemistry and Applied Biosc.::02515 - Laboratorium für Physikalische Chemie / Laboratory of Physical Chemistry::03910 - Schmidt, Thomas J. / Schmidt, Thomas J.
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02140 - Dep. Inf.technologie und Elektrotechnik / Dep. of Inform.Technol. Electrical Eng.::02631 - Institut für Biomedizinische Technik / Institute for Biomedical Engineering::03817 - Stampanoni, Marco F.M. / Stampanoni, Marco F.M.
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02020 - Dep. Chemie und Angewandte Biowiss. / Dep. of Chemistry and Applied Biosc.::02515 - Laboratorium für Physikalische Chemie / Laboratory of Physical Chemistry::03910 - Schmidt, Thomas J. / Schmidt, Thomas J.
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02140 - Dep. Inf.technologie und Elektrotechnik / Dep. of Inform.Technol. Electrical Eng.::02631 - Institut für Biomedizinische Technik / Institute for Biomedical Engineering::03817 - Stampanoni, Marco F.M. / Stampanoni, Marco F.M.
ethz.date.deposited
2018-11-09T04:56:12Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-11-27T12:15:43Z
ethz.rosetta.lastUpdated
2019-02-03T11:47:48Z
ethz.rosetta.versionExported
true
ethz.COinS
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