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  Growth of Porous Platinum Catalyst Structures on Tungsten Oxide Support Materials: A New Design for Electrodes

Hengge, K., Heinzl, C., Perchthaler, M., Geiger, S., Mayrhofer, K. J. J., & Scheu, C. (2017). Growth of Porous Platinum Catalyst Structures on Tungsten Oxide Support Materials: A New Design for Electrodes. Crystal Growth & Design, 17(4), 1661-1668. doi:10.1021/acs.cgd.6b01663.

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 Urheber:
Hengge, Katharina1, Autor           
Heinzl, Christoph2, Autor           
Perchthaler, Markus3, Autor           
Geiger, Simon4, Autor           
Mayrhofer, Karl J. J.4, Autor           
Scheu, Christina1, 5, Autor           
Affiliations:
1Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              
2Elcore GmbH, Bayerwaldstr. 3, D-81737 München , ou_persistent22              
3Elcore GmbH, Bayerwaldstr. 3, D-81737 München, ou_persistent22              
4Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
5Materials Analytics, RWTH Aachen University, Kopernikusstrasse 10, Aachen, Germany, ou_persistent22              

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Schlagwörter: MEMBRANE FUEL-CELLS; 3-DIMENSIONAL RECONSTRUCTION; DISCRETE TOMOGRAPHY; DEGRADATION; SIRT; NANOPARTICLES; NANOMATERIALS; TRANSITION; CRYSTALS; SURFACES;
 Zusammenfassung: The growth of a promising material system for high-temperature polymer-electrolyte-membrane-fuel, cells, namely, platinum-(Pt) loaded tungsten suboxide (WO3-x) electrodes, has been studied in-depth. The template-free twostep synthesis-results in highly porous three-dimensional networks of crystalline Pt nanorods on the WO3-x support. The formation, and growth behavior of these catalyst morphologies arc investigated as a function of the deposition time of the catalyst precursor by use of scanning electron microscopy and various transmission electron microscopy techniques. The analysis reveals that octahedral-shaped bulk crystals of the Pt-precursor are formed on the WO3-x support, which subsequently reduce during the thermal treatment. After a reduction time of 4 min, the core of the catalyst Morphologies is still bulk material, composed of Pt nanoparticles embedded in-a, reduced form of the Pt precursor, while the outer shell is formed by a porous network of polycrystalline Pt. Electron tomography helps to reveal the connectivity of the Pt network and allows calculation of the surface-area of a 100 nm X 100 nm portion. This is compared to the macroscopic value for the surface area of the samples' entire network obtained by cyclic voltammery.

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Sprache(n): eng - English
 Datum: 2017-04-05
 Publikationsstatus: Erschienen
 Seiten: 8
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: ISI: 000398884400029
DOI: 10.1021/acs.cgd.6b01663
 Art des Abschluß: -

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Titel: Crystal Growth & Design
  Andere : Cryst. Growth Des.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Washington, DC : American Chemical Society
Seiten: - Band / Heft: 17 (4) Artikelnummer: - Start- / Endseite: 1661 - 1668 Identifikator: ISSN: 1528-7483
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570353