Journal Article

FZJ-2017-00476

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure and Proton Dynamics in Catalytic Layer of HT-PEFC

Khaneft, M. (Corresponding author)FZJ* ; Holderer, O.FZJ* ; Ivanova, O.FZJ* ; Lüke, W. ; Kentzinger, E.FZJ* ; Appavou, M.-S.FZJ* ; Zorn, R.FZJ* ; Lehnert, W.FZJ*

2016
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/fuce.201500167

Abstract: The present study focuses on structural and dynamical properties of the catalytic layer for high-temperature polymer electrolyte fuel cells (HT-PEFC). The catalytic layer is a composite material containing nanoporous carbon, poly(tetrafluoroethylene) (PTFE) and platinum (Pt) nanoparticles. The structure of the catalyst is investigated using small angle X-ray scattering (SAXS) following different preparation steps of the electrodes: pure carbon support, platinum/carbon (Pt/C) powder and finally, complete catalytic layer. The structural properties of the Pt/C powder containing different amounts of Pt are discussed along with the size distribution of Pt particles and their arrangement on the surface of the carbon support. Following the preparation sequence of the catalytic layer based on the Pt/C powders the electrodes with different final Pt loadings are analyzed in details. Investigation of the structure of the catalytic layer is accompanied by the study of nanosecond dynamics of the phosphoric acid (PA) in the catalytic layer containing different amount of Pt by means of neutron backscattering spectroscopy. The structure of the catalytic layer is mostly determined by the structure of the catalytic powder and does not vary significantly with Pt loading in the electrode. The behavior of the PA is sensitive to the Pt content in the electrode.

Keyword(s): Energy (1st) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. Elektrochemische Verfahrenstechnik (IEK-3)
4. Streumethoden (PGI-4)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)
2. 144 - Controlling Collective States (POF3-144) (POF3-144)
3. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
4. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. SPHERES: Backscattering spectrometer (NL6S)

Appears in the scientific report 2016

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Database coverage:
Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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