This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1016/j.ijhydene.2009.09.076 in citations.
Redistribution of Phosphoric Acid in Membrane Electrode Assemblies for High Temperature Polymer Electrolyte Fuel Cells
Redistribution of Phosphoric Acid in Membrane Electrode Assemblies for High Temperature Polymer Electrolyte Fuel Cells
We demonstrate that the performance of a high-temperature polymer electrolyte fuel cell with a phosphoric acid-based electrolyte is almost independent of the way of introducing the acid into the membrane electrode assembly (MEA). The same power densities were obtained with different MEAs in which th...
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Personal Name(s): | Wannek, C. |
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Konradi, I. / Mergel, J. / Lehnert, W. | |
Contributing Institute: |
Brennstoffzellen; IEF-3 |
Published in: | International journal of hydrogen energy, 34 (2009) S. 9479 - 9485 |
Imprint: |
New York, NY [u.a.]
Elsevier
2009
|
Physical Description: |
9479 - 9485 |
DOI: |
10.1016/j.ijhydene.2009.09.076 |
Document Type: |
Journal Article |
Research Program: |
Rationelle Energieumwandlung |
Series Title: |
International Journal of Hydrogen Energy
34 |
Subject (ZB): | |
Publikationsportal JuSER |
We demonstrate that the performance of a high-temperature polymer electrolyte fuel cell with a phosphoric acid-based electrolyte is almost independent of the way of introducing the acid into the membrane electrode assembly (MEA). The same power densities were obtained with different MEAs in which the poly(2,5-benzimidazole) membrane was either pre-doped or not and in which either one or two catalyst layers were impregnated with H3PO4 Chemical analysis after shut down revealed that in all these MEAs the phosphoric acid distribution between the membrane and the electrodes was nearly the same. An MEA with acid impregnation via the electrodes was started up rapidly from room temperature, delivered a power density of 120 mW cm(-2) at 600 mV (H-2/air, 160 degrees C, ambient pressure) after only 11 min and was operated for 1000 h (degradation rate. 0.06 mV/h) Based on the analysis of the H3PO4 content in the MEA components, reflections on the kinetics of the redistribution of phosphoric acid within the MEA are provided (C) 2009 Professor T. Nejat Veziroglu Published by Elsevier Ltd All rights reserved. |