The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Structural Characterization of Carbon-Supported Platinum−Ruthenium Nanoparticles from the Molecular Cluster Precursor PtRu5C(CO)16
Abstract
We describe the preparation and structural characterization of carbon-supported Pt−Ru nanoparticles with exceptionally narrow size and compositional distributions. The supported bimetallic particles are obtained by reduction of the neutral molecular carbonyl cluster precursor PtRu 5 C(CO) 16 with hydrogen. A detailed structural model of the nanoparticles has been deduced on the basis of studies by in situ extended X-ray absorption fine structure spectroscopy (EXAFS), scanning transmission electron microscopy, microprobe energy-dispersive X-ray analysis, and electron microdiffraction. These experiments show that the bimetallic nanoparticles have a Pt:Ru composition of 1:5 and an average diameter of ca. 1.5 nm and adopt a face-centered cubic closest packing structure. These results demonstrate a marked sensitivity of the metal particle structure to nanoscale size effects inasmuch as the thermodynamically stable phase for bulk alloys of this composition is hexagonal close-packed. The local metal coordination environment, revealed by multiple scattering analysis of the EXAFS data, shows the presence of a nonstatistical distribution of different metal atoms in the nanoparticles. Specifically, Pt shows a marked preference for segregation to the particle surfaces under an ambient H 2 atmosphere. Oxidation of the alloy particle in O 2 produces an outer metal oxide layer surrounding a metal-only core. This oxidation is easily reversed by exposing the nanoparticles to H 2 at room temperature.
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Cites
In Situ X‐Ray Absorption Studies of a Pt‐Ru Electrocatalyst
McBreen, J., & Mukerjee, S. (1995) · Journal of The Electrochemical Society · doi:10.1149/1.2049993 · Cited by 242
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Metadata
- Authors
- Nashner, M. S., Frenkel, A. I., Adler, D. L., Shapley, J. R., & Nuzzo, R. G.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-08-01
- Volume
- 119
- Issue
- 33
- Pages
- 7760-7771
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2118919932
- Cited by
- 318
- References
- 1
- FWCI
- 8.82
- Type
- journal article
- Language
- en
- Open access
- closed
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