This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1016/j.jpowsour.2011.02.007 in citations.
Degradation effects at the methanol inlet, outlet and center region of a stack MEA operated in DMFC
Degradation effects at the methanol inlet, outlet and center region of a stack MEA operated in DMFC
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 di...
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Personal Name(s): | Dixon, D. |
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Wippermann, K. / Mergel, J. / Schökel, A. / Zils, S. / Roth, C. | |
Contributing Institute: |
Technoökonomische Systemanalyse; IEK-3 |
Published in: | Journal of power sources, 196 (2011) S. 5538 - 5545 |
Imprint: |
New York, NY [u.a.]
Elsevier
2011
|
Physical Description: |
5538 - 5545 |
DOI: |
10.1016/j.jpowsour.2011.02.007 |
Document Type: |
Journal Article |
Research Program: |
Rationelle Energieumwandlung |
Series Title: |
Journal of Power Sources
196 |
Subject (ZB): | |
Publikationsportal JuSER |
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. (C) 2011 Elsevier B.V. All rights reserved. |