Roth, C. ; Benker, N. ; Mazurek, M. ; Scheiba, F. ; Fuess, H. (2005)
Development of an In-Situ Cell for X-ray Absorption Measurements During Fuel Cell Operation.
In: Advanced Engineering Materials, 7 (10)
doi: 10.1002/adem.200500122
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A novel in-situ cell was designed to allow measurements during real fuel cell operation. Thus, potential and fuel dependent changes in the catalyst structure can be pursued in-situ. The X-ray absorption cell was built first in transmission geometry with an inherent graphite beam window, and spectra were recorded at the Pt L3-edge. This design, however, was not feasible for measurements at the Ru K-edge due to the strong absorption of Pt in the Pt-Ru anode catalyst and the low ruthenium content. Therefore, the cell was modified in a second step using either a Be or a Kapton® foil window to allow for fluorescence measurements. The fluorescence set-up offers the additional advantage that Pt at the anode can be separated from Pt at the cathode side without the need to remove part of the cathode in the beam window region. The optimum set-up for both the Pt L3- and the Ru K-edge was found to be the cell hardware modified with a Kapton® window in fluorescence geometry. Spectra of different supported and unsupported electrocatalysts were recorded at different potentials at both edges in hydrogen, H2/CO and methanol operation. But only measurements at a carbon-supported and an unsupported Pt-Ru catalyst in hydrogen will be presented here. Upon first contact with the fuel, both Pt and Ru (surface) oxides present in the as-received state are reduced. Potential-dependent changes, however, are less evident and can be revealed by data fits only.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2005 |
| Autor(en): | Roth, C. ; Benker, N. ; Mazurek, M. ; Scheiba, F. ; Fuess, H. |
| Art des Eintrags: | Bibliographie |
| Titel: | Development of an In-Situ Cell for X-ray Absorption Measurements During Fuel Cell Operation |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2005 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Advanced Engineering Materials |
| Jahrgang/Volume einer Zeitschrift: | 7 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1002/adem.200500122 |
| Kurzbeschreibung (Abstract): | A novel in-situ cell was designed to allow measurements during real fuel cell operation. Thus, potential and fuel dependent changes in the catalyst structure can be pursued in-situ. The X-ray absorption cell was built first in transmission geometry with an inherent graphite beam window, and spectra were recorded at the Pt L3-edge. This design, however, was not feasible for measurements at the Ru K-edge due to the strong absorption of Pt in the Pt-Ru anode catalyst and the low ruthenium content. Therefore, the cell was modified in a second step using either a Be or a Kapton® foil window to allow for fluorescence measurements. The fluorescence set-up offers the additional advantage that Pt at the anode can be separated from Pt at the cathode side without the need to remove part of the cathode in the beam window region. The optimum set-up for both the Pt L3- and the Ru K-edge was found to be the cell hardware modified with a Kapton® window in fluorescence geometry. Spectra of different supported and unsupported electrocatalysts were recorded at different potentials at both edges in hydrogen, H2/CO and methanol operation. But only measurements at a carbon-supported and an unsupported Pt-Ru catalyst in hydrogen will be presented here. Upon first contact with the fuel, both Pt and Ru (surface) oxides present in the as-received state are reduced. Potential-dependent changes, however, are less evident and can be revealed by data fits only. |
| Freie Schlagworte: | Fuel cells, X-ray characterization |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Erneuerbare Energien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 20 Feb 2013 09:31 |
| Letzte Änderung: | 05 Mär 2013 10:05 |
| PPN: | |
| Sponsoren: | Support of this work by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie is gratefully acknowledged., M. Mazurek is supported by a Graduiertenstipendium des Landes Hessen. |
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