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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C627-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6C19-B
Genre: Journal Article

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 Creators:
Hengge, Katharina1, Author              
Heinzl, Christoph2, Author              
Perchthaler, Markus3, Author              
Geiger, Simon4, Author              
Mayrhofer, Karl J. J.4, Author              
Scheu, Christina1, 5, Author              
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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Free keywords: MEMBRANE FUEL-CELLS; 3-DIMENSIONAL RECONSTRUCTION; DISCRETE TOMOGRAPHY; DEGRADATION; SIRT; NANOPARTICLES; NANOMATERIALS; TRANSITION; CRYSTALS; SURFACES;
 Abstract: 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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Language(s): eng - English
 Dates: 2017-04-05
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000398884400029
DOI: 10.1021/acs.cgd.6b01663
 Degree: -

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Title: Crystal Growth & Design
  Other : Cryst. Growth Des.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 17 (4) Sequence Number: - Start / End Page: 1661 - 1668 Identifier: ISSN: 1528-7483
CoNE: /journals/resource/110978984570353