Gas-Induced Segregation in Pt-Rh Alloy Nanoparticles Observed by in Situ Bragg Coherent Diffraction Imaging
SCIE
SCOPUS
- Title
- Gas-Induced Segregation in Pt-Rh Alloy Nanoparticles Observed by in Situ Bragg Coherent Diffraction Imaging
- Authors
- Kawaguchi, Tomoya; Keller, Thomas F.; Runge, Henning; Gelisio, Luca; Seitz, Christoph; Kim, Young Yong; Maxey, Evan R.; Cha, Wonsuk; Ulvestad, Andrew; Hruszkewycz, Stephan O.; Harder, Ross; Vartanyants, Ivan A.; Stierle, Andreas; You, Hoydoo
- Date Issued
- 2019-12
- Publisher
- American Physical Society
- Abstract
- Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing and reducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fields to compositional distributions in crystalline Pt-Rh alloy nanoparticles. Three-dimensional images of internal composition showed that the radial distribution of compositions reverses partially between the surface shell and the core when gas flow changes between O-2 and H-2. Our observation suggests that the elemental segregation of nanoparticle catalysts should be highly active during heterogeneous catalysis and can be a controlling factor in synthesis of electrocatalysts. In addition, our study exemplifies applications of BCDI for in situ 3D imaging of internal equilibrium compositions in other bimetallic alloy nanoparticles.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/122967
- DOI
- 10.1103/physrevlett.123.246001
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- Physical Review Letters, vol. 123, no. 24, 2019-12
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.