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Microscopic Investigation of Platinum Deposition in PEMFC Cross-Sections Using AFM and SEM

Helmly, Stefan and Hiesgen, Renate and Morawietz, Tobias and Yuan, Xiao-Zi and Wang, Haijiang and Friedrich, K. Andreas (2013) Microscopic Investigation of Platinum Deposition in PEMFC Cross-Sections Using AFM and SEM. Journal of The Electrochemical Society, 160 (6), pp. 687-697. Electrochemical Society, Inc.. DOI: 10.1149/2.130306jes ISSN 0013-4651

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Abstract

Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to investigate platinum (Pt) deposition in the membrane of degraded proton exchange membrane fuel cells (PEMFCs). This study focuses on Pt distribution and microscopic aspects of accelerated membrane degradation. To facilitate post-mortem analysis, a 4-cell stack was specially designed with cells composed of two membranes. Considerable Pt deposition was observed in both membranes and at their interface. Significant crystallite growth in the form of a Pt band and membrane thinning was present in the membrane at the cathode side, which supports the hypothesis that Pt deposition accelerates polymer decomposition. Furthermore, a large continuous area of Pt crystals across the whole cathode membrane was detected. In addition, conductive AFM measurements revealed electronic connections across the membrane. These results indicate the formation of electronic short-circuits in the cell due to the accumulation of Pt particles, which has not been previously reported. Moreover, AFM proved to be more sensitive to detect Pt deposits and its effects than SEM.

Item URL in elib:https://elib.dlr.de/84171/
Document Type:Article
Title:Microscopic Investigation of Platinum Deposition in PEMFC Cross-Sections Using AFM and SEM
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Yuan, Xiao-Zi National Research Council CanadaUNSPECIFIED
Wang, HaijiangNational Research Council CanadaUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:15 April 2013
Journal or Publication Title:Journal of The Electrochemical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:160
DOI :10.1149/2.130306jes
Page Range:pp. 687-697
Publisher:Electrochemical Society, Inc.
ISSN:0013-4651
Status:Published
Keywords:Nafion, degradation, platinum, microscopy
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: Helmly, Stefan
Deposited On:10 Sep 2013 14:56
Last Modified:08 Mar 2018 18:46

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