Journal Article

FZJ-2015-01615

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Element-specific anisotropic growth of shaped platinum alloy nanocrystals

Gan, L. (Corresponding Author) ; Cui, C. ; Heggen, M.FZJ* ; Dionigi, F. ; Rudi, S. ; Strasser, P.

2014
American Association for the Advancement of Science64196 Washington, DC [u.a.]

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Please use a persistent id in citations: doi:10.1126/science.1261212

Abstract: Morphological shape in chemistry and biology owes its existence to anisotropic growth and is closely coupled to distinct functionality. Although much is known about the principal growth mechanisms of monometallic shaped nanocrystals, the anisotropic growth of shaped alloy nanocrystals is still poorly understood. Using aberration-corrected scanning transmission electron microscopy, we reveal an element-specific anisotropic growth mechanism of platinum (Pt) bimetallic nano-octahedra where compositional anisotropy couples to geometric anisotropy. A Pt-rich phase evolves into precursor nanohexapods, followed by a slower step-induced deposition of an M-rich (M = Ni, Co, etc.) phase at the concave hexapod surface forming the octahedral facets. Our finding explains earlier reports on unusual compositional segregations and chemical degradation pathways of bimetallic polyhedral catalysts and may aid rational synthesis of shaped alloy catalysts with desired compositional patterns and properties.

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Contributing Institute(s):

1. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 42G - Peter Grünberg-Centre (PG-C) (POF2-42G41) (POF2-42G41)

Appears in the scientific report 2014

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