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Helmly, Stefan and Ohnmacht, Benjamin and Hiesgen, Renate and Gülzow, Erich and Friedrich, K. Andreas (2013) Influence of Platinum Precipitation on Properties and Degradation of Nafion® Membranes. ECS Transactions, pp. 969-990. Electrochemical Society, Inc.. ISSN 1938-5862
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Abstract
In this study, the role of Pt concentration and distribution in the membrane on ionomer degradation was investigated. Nafion® membranes were impregnated with different mass fraction of Pt via ion-exchange and operated as membrane electrode assemblies (MEAs) at open circuit voltage (OCV). Various MEAs with known Pt concentration were characterized by electrochemical in-situ measurements regarding both, membrane properties and ionomer degradation. Additionally, Pt particle distribution in the membrane cross sections was analyzed. The presence of Pt precipitations was found to influence ionic conductivity and the sensitivity of cell performance for humidification. Ionomer decomposition increased with concentration and surface area of Pt deposits as well as distance between particles. The comparison between Pt precipitated artificially and during operation showed a considerable difference in particle distribution and extent of internal membrane humidification due to water formation at Pt sites.
| Item URL in elib: | https://elib.dlr.de/84903/ | ||||||||||||||||||
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| Document Type: | Article | ||||||||||||||||||
| Title: | Influence of Platinum Precipitation on Properties and Degradation of Nafion® Membranes | ||||||||||||||||||
| Authors: |
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| Date: | 2013 | ||||||||||||||||||
| 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 | ||||||||||||||||||
| Page Range: | pp. 969-990 | ||||||||||||||||||
| Publisher: | Electrochemical Society, Inc. | ||||||||||||||||||
| ISSN: | 1938-5862 | ||||||||||||||||||
| Status: | Published | ||||||||||||||||||
| Keywords: | Polymer electrolyte, Fuel cell, Pt catalyst, 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: | Garcia Sanchez, Dr Daniel | ||||||||||||||||||
| Deposited On: | 30 Oct 2013 12:00 | ||||||||||||||||||
| Last Modified: | 06 Sep 2019 15:24 |
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