Controlled synthesis and characterization of Ru-core-Pt-shell bimetallic nanoparticles

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DOIResolve DOI: http://doi.org/10.1021/jp807154a
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleThe Journal of Physical Chemistry C
Volume112
Issue50
Pages1992219929; # of pages: 8
AbstractA combined polyol and redox-transmetalation strategy has been proposed to synthesize Rucore-Ptshell bimetallic nanoparticles. By following the in situ X-ray absorption spectroscopy (XAS) at the Pt LIII and Ru K edges, the reduction mechanism of Ru nanoparticles (NPs) in tetraethylene glycol (TEG) solutions and the corresponding reaction of Ru NPs with the added Pt²⁺ ions in ethylene glycol (EG) solutions to form Rucore-Ptshell bimetallic nanoparticles was examined. The Pt LIII-edge XAS indicates that when the pH of H₂PtCl₆ in EG solution is adjusted to 12 and heated at 80 °C for 5 min, the platinum compound is found to be reduced to a Pt(II) form corresponding to [PtCl₄]²⁻ anionic species. At further reaction time of 10 min, the ligand environment around Pt(II) is changed from Cl⁻ to OH⁻ forming the [Pt(OH)₄]²⁻ species. Analysis of the Ru K-edge XAS results confirms that Ru₃(CO)₁₂ in TEG undergoes a partial decarbonylation when it is heated at 300 °C for 30 min and forms Ru₃(CO)₉ species. At further reaction time of 60 min, Ru₃(CO)₉ species are subjected to a complete decarbonylation to form Ru clusters in TEG solutions. When the EG solution containing [Pt(OH)₄]²⁻ ionic species is mixed with preformed Ru clusters, Pt²⁺ ions are reduced to Pt° on preformed Ru clusters at the expense of Ru via a redox-transmetalation process. The XAS structural parameters suggested that the resulting nanoparticles were of Rucore-Ptshell type structure with a higher extent of atomic distribution of Pt in the cluster when compared with Ru. The unique application of XAS as a fundamental characterization tool to realize the core-shell structure demonstrated here on the Ru-Pt bimetallic system can easily be extended to construct many other types of bimetallic systems for interesting applications.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52144
NPARC number15329315
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Record identifiera21bbb1d-3ac8-48f4-97ab-be18ee65b55c
Record created2010-05-19
Record modified2017-03-23
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