Journal Article

PUBDB-2019-05420

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Gas-Induced Segregation in Pt-Rh Alloy Nanoparticles Observed by In Situ Bragg Coherent Diffraction Imaging

Kawaguchi, T. ; Keller, T. F.DESY* ; Runge, H.DESY* ; Gelisio, L.CFEL*DESY* ; Seitz, C.Extern*DESY* ; Kim, Y. Y.DESY* ; Maxey, E. R.Extern* ; Cha, W.Extern* ; Ulvestad, A.Extern* ; Hruszkewycz, S. O.Extern* ; Harder, R.Extern* ; Vartanyants, I. A.DESY* ; Stierle, A.DESY* ; You, H. (Corresponding author)Extern*

2019
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.123.246001  doi:10.3204/PUBDB-2019-05420

Abstract: Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing andreducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fieldsto compositional distributions in crystalline Pt-Rh alloy nanoparticles. Three-dimensional images ofinternal composition showed that the radial distribution of compositions reverses partially between thesurface shell and the core when gas flow changes between O2 and H2. Our observation suggests that theelemental segregation of nanoparticle catalysts should be highly active during heterogeneous catalysis andcan be a controlling factor in synthesis of electrocatalysts. In addition, our study exemplifies applications ofBCDI for in situ 3D imaging of internal equilibrium compositions in other bimetallic alloy nanoparticles.

Note: © American Physical Society

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Contributing Institute(s):

1. Nanolab (FS-NL)
2. FS-Photon Science (FS-PS)
3. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)
2. NFFA-Europe_supported - Technically supported by Nanoscience Foundries and Fine Analysis Europe (2020_Join2-NFFA-Europe_funded) (2020_Join2-NFFA-Europe_funded)
3. NFFA-Europe - NANOSCIENCE FOUNDRIES AND FINE ANALYSIS - EUROPE (654360) (654360)

Experiment(s):

1. DESY NanoLab: Microscopy
2. DESY NanoLab: Sample Preparation

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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