| Autor: |
Nazih Hakim, Madhu Sudan Saha, Sanjeev Mukerjee, Gulla Andrea F, Thomas M. Arruda, Nagappan Ramaswamy, W. Wen |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Electrochimica Acta. 54:6756-6766 |
| ISSN: |
0013-4686 |
| Popis: |
Ultra low loading noble metal (0.04–0.12 mgPt/cm2) based electrodes were obtained by direct metallization of non-catalyzed gas diffusion layers via dual ion beam assisted deposition (IBAD) method. Fuel cell performance results reported earlier indicate significant improvements in terms of mass specific power density of 0.297 gPt/kW with 250 A thick IBAD deposit (0.04 mgPt/cm2 for a total MEA loading of 0.08 mgPt/cm2) at 0.65 V in contrast to the state of the art power density of 1.18 gPt/kW using 1 mgPt(MEA)/cm2 at 0.65 V. In this article we report the peroxide radical initiated attack of the membrane electrode assembly utilizing IBAD electrodes in comparison to commercially available E-TEK (now BASF Fuel Cell GmbH) electrodes and find the pathway of membrane degradation as well. A novel segmented fuel cell is used for this purpose to relate membrane degradation to peroxide generation at the electrode/electrolyte interface by means of systematic pre and post analyses of the membrane are presented. Also, we present the results of in situ X-ray absorption spectroscopy (XAS) experiments to elucidate the structure/property relationships of these electrodes that lead to superior performance in terms of gravimetric power density obtained during fuel cell operation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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