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Carbon Support Effects on Bimetallic Pt−Ru Nanoparticles Formed from Molecular Precursors
Abstract
We describe the preparation, structural characterization, and support interactions experienced by two different compositions of Pt−Ru nanoparticles supported on several carbons (carbon black, fullerene soot, and desulfurized carbon black). The bimetallic nanoparticles, obtained by reduction of the neutral molecular precursors PtRu 5 C(CO) 16 and Pt 2 Ru 4 (CO) 18 (the latter of which lacks a central “stabilizing” carbide core) at elevated temperatures in a hydrogen atmosphere, show a structural homology, exhibiting exceptionally narrow size and compositional distributions. A detailed structural picture of the nanoparticles has been deduced on the basis of in-situ extended X-ray absorption fine structure (EXAFS), scanning transmission electron microscopy (STEM), energy-dispersive X-ray analysis (EDX), and X-ray absorption near edge structure (XANES). These techniques reveal that the bimetallic nanoparticles have Pt/Ru compositions of 1:5 and 2:4, respectively, and average diameters lying between 1.0 and 1.5 nm. The local metal coordination environments reveal a nonstatistical distribution of the two metals in the nanoparticles. Specifically, Pt shows a marked preference for segregation to the particle surfaces under an H 2 atmosphere. The data also reveal a difference in the structural environment of the nanoparticles when formed on the fullerene soot support. Interactions between Ru and low- Z atoms are revealed through XANES, which, taken collectively with the other data presented, leads us to propose a possible Ru−C compound formation on this latter support phase.
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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
Cited by
Yang, H., Vogel, W., Lamy, C., & Alonso-Vante, N. (2004) · The Journal of Physical Chemistry B · doi:10.1021/jp049034+ · Cited by 323
Deivaraj, T. C., & Lee, J. Y. (2005) · Journal of Power Sources · doi:10.1016/j.jpowsour.2004.10.010 · Cited by 174
Park, K. C., Jang, I. Y., Wongwiriyapan, W., Morimoto, S., Kim, Y. J., Jung, Y. C., Toya, T., & Endo, M. (2010) · Journal of Materials Chemistry · doi:10.1039/b923153f · Cited by 66
Metadata
- Authors
- Hills, C. W., Nashner, M. S., Frenkel, A. I., Shapley, J. R., & Nuzzo, R. G.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-01-06
- Volume
- 15
- Issue
- 3
- Pages
- 690-700
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2018618424
- Cited by
- 173
- References
- 1
- FWCI
- 8.74
- Type
- journal article
- Language
- en
- Open access
- closed
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- Hills, C. W., Nashner, M. S., Frenkel, A. I., Shapley, J. R., & Nuzzo, R. G. (1999). Carbon Support Effects on Bimetallic Pt−Ru Nanoparticles Formed from Molecular Precursors. Langmuir. https://doi.org/10.1021/la980921b
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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