Investigation of the local catalyst distribution in an aged direct methanol fuel cell MEA by means of differential synchrotron X-ray absorption edge imaging with high energy resolution
- Synchrotron X-ray absorption edge imaging with high energy resolution was applied to study aging of fuel cell catalyst materials. The combination of an imaging and a high X-ray energy resolution set-up allows acquiring spatially resolved XAS (XANES and EXAFS) spectra. We analyzed the two-dimensional distribution of Pt and Ru in fresh and aged fuel cell catalysts. Spatially resolved XAS images were taken at the RuK edge and at the PtL3 edge. Taking radiographs above and below the absorption edges provides quantitative information about the thickness of the catalytic materials and additional chemical information. A strong influence of the flow field channels and the structure of the gas diffusion layers on the thicknesses of the catalytic elements were found: a thinner catalyst layer was found below the ribs of the flow field geometries as well as under crossing points of fiber bundles of the woven gas diffusion layers.
Autor*innen: | Tobias Arlt, I. Manke, K. Wippermann, Heinrich Riesemeier, J. Mergel, J. Banhart |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Journal of power sources |
Jahr der Erstveröffentlichung: | 2013 |
Verlag: | Elsevier |
Verlagsort: | Amsterdam [u.a.] |
Jahrgang/Band: | 221 |
Erste Seite: | 210 |
Letzte Seite: | 216 |
Freie Schlagwörter: | Aging mechanism; Direct methanol fuel cell; Membrane electrode assembly; X-ray energy edge; X-ray synchrotron radiography; XAS |
DOI: | 10.1016/j.jpowsour.2012.08.038 |
ISSN: | 0378-7753 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 20.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 12.12.2012 |