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  Shape-Controlled Nanoparticles in Pore-Confined Space

Knossalla, J., Paciok, P., Göhl, D., Jalalpoor, D., Pizzutilo, E., Mingers, A. M., et al. (2018). Shape-Controlled Nanoparticles in Pore-Confined Space. Journal of the American Chemical Society, 140(46), 15684-15689. doi:10.1021/jacs.8b07868.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-D04C-E Version Permalink: http://hdl.handle.net/21.11116/0000-0002-D04D-D
Genre: Journal Article

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 Creators:
Knossalla, Johannes1, Author              
Paciok, Paul2, Author              
Göhl, Daniel3, Author              
Jalalpoor, Daniel1, Author              
Pizzutilo, Enrico3, Author              
Mingers, Andrea Maria3, Author              
Heggen, Marc4, Author              
Dunin-Borkowski, Rafal E.5, Author              
Mayrhofer, Karl Johann Jakob3, 6, 7, Author              
Schüth, Ferdi1, Author              
Ledendecker, Marc3, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Ernst-Ruska Centre for Microscopy and Spectroscopy with Electrons, Peter Grünberg Institute, Forschungszentrum Jülich, Jülich, 52425, Germany, ou_persistent22              
3Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
4Ernst Ruska Center for Microscopy and Spectroscopy with Electrons, Forschungzentrum Jülich GmbH, Jülich, Germany, ou_persistent22              
5Peter Grünberg Institut, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany, ou_persistent22              
6Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany, ou_persistent22              
7Helmholtz-Institute Erlangen-Nuremberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Egerlandstrasse 3, 91058 Erlangen, Germany, ou_persistent22              

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Free keywords: Binary alloys; Catalysis; Metal nanoparticles; Molybdenum alloys; Ostwald ripening; Platinum; Platinum alloys; Stabilization; Surface reactions, Catalytic materials; Catalytic reactions; Elemental compositions; Metal dissolution; Morphological changes; Specific activity; Strong interaction; Support materials, Catalyst activity
 Abstract: Increasing the catalyst's stability and activity are one of the main quests in catalysis. Tailoring crystal surfaces to a specific reaction has demonstrated to be a very effective way in increasing the catalyst's specific activity. Shape controlled nanoparticles with specific crystal facets are usually grown kinetically and are highly susceptible to morphological changes during the reaction due to agglomeration, metal dissolution, or Ostwald ripening. A strong interaction of the catalytic material to the support is thus crucial for successful stabilization. Taken both points into account, a general catalyst design is proposed, combining the enhanced activity of shape-controlled nanoparticles with a pore-confinement approach for high stability. Hollow graphitic spheres with narrow and uniform bimodal mesopores serve as model system and were used as support material. As catalyst, different kinds of particles, such as pure platinum (Pt), platinum/nickel (Pt3Ni) and Pt3Ni doped with molybdenum (Pt3Ni-Mo), have exemplarily been synthesized. The advantages, limits and challenges of the proposed concept are discussed and elaborated by means of time-resolved, in and ex situ measurements. It will be shown that during catalysis, the potential boundaries are crucial especially for the proposed catalyst design, resulting in either retention of the initial activity or drastic loss in shape, size and elemental composition. The synthesis and catalyst design can be adapted to a wide range of catalytic reactions where stabilization of shape-controlled particles is a focus. © 2018 American Chemical Society.

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Language(s): eng - English
 Dates: 2018-11-21
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/jacs.8b07868
 Degree: -

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Title: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 140 (46) Sequence Number: - Start / End Page: 15684 - 15689 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870