Dixon, D. ; Wippermann, K. ; Mergel, J. ; Schoekel, A. ; Zils, S. ; Roth, C. (2011)
Degradation effects at the methanol inlet, outlet and center region of a stack MEA operated in DMFC.
In: Journal of Power Sources, 196 (13)
doi: 10.1016/j.jpowsour.2011.02.007
Article, Bibliographie
Abstract
Ru dissolution is one of the key issues in direct methanol fuel cells (DMFC). A used DMFC stack membrane electrode assembly (MEA) was analyzed using different analytical techniques like X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM) and EDX and different regions probed in the process. Catalyst powder from e.g. like methanol inlet, outlet and center were investigated and compared with the as-received commercial electrocatalyst and the pristine MEA after manufacture. The large oxidized ruthenium fraction in the anode catalyst was found to play a significant role in particle growth and ruthenium dissolution. Crossover ruthenium from the anode side was found to be dispersed everywhere in the cathode in its oxidized form, and thus can have a significant effect on the oxygen reduction activity (ORR). Although with XRD no significant structural changes were observed for the different regions of the MEA, TEM and EDX analysis showed the preferential precipitation of the Ru at the methanol outlet.
| Item Type: | Article |
|---|---|
| Erschienen: | 2011 |
| Creators: | Dixon, D. ; Wippermann, K. ; Mergel, J. ; Schoekel, A. ; Zils, S. ; Roth, C. |
| Type of entry: | Bibliographie |
| Title: | Degradation effects at the methanol inlet, outlet and center region of a stack MEA operated in DMFC |
| Language: | English |
| Date: | 1 July 2011 |
| Publisher: | Elsevier Science Publishing Company |
| Journal or Publication Title: | Journal of Power Sources |
| Volume of the journal: | 196 |
| Issue Number: | 13 |
| DOI: | 10.1016/j.jpowsour.2011.02.007 |
| Abstract: | Ru dissolution is one of the key issues in direct methanol fuel cells (DMFC). A used DMFC stack membrane electrode assembly (MEA) was analyzed using different analytical techniques like X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM) and EDX and different regions probed in the process. Catalyst powder from e.g. like methanol inlet, outlet and center were investigated and compared with the as-received commercial electrocatalyst and the pristine MEA after manufacture. The large oxidized ruthenium fraction in the anode catalyst was found to play a significant role in particle growth and ruthenium dissolution. Crossover ruthenium from the anode side was found to be dispersed everywhere in the cathode in its oxidized form, and thus can have a significant effect on the oxygen reduction activity (ORR). Although with XRD no significant structural changes were observed for the different regions of the MEA, TEM and EDX analysis showed the preferential precipitation of the Ru at the methanol outlet. |
| Uncontrolled Keywords: | Degradation, DMFC, Ru dissolution, Area-specific, Inlet, Outlet, Stack ME |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 25 Feb 2013 12:27 |
| Last Modified: | 05 Mar 2013 10:05 |
| PPN: | |
| Funders: | Financial support of the BMBF under grant no. 03SF0324E is gratefully acknowledged. |
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