Formation of Pt−Ru Nanoparticles in Ethylene Glycol Solution: An in Situ X-ray Absorption Spectroscopy Study | Zendy

Loka Subramanyam Sarma | Zendy; ChingHsiang Chen | Zendy; Sakkarapalayam Murugesan Senthil Kumar | Zendy; GuoRung Wang | Zendy; Shih-Chieh Yen | Zendy; DinGoa Liu | Zendy; HwoShuenn Sheu | Zendy; Kuan-Li Yu | Zendy; MauTsu Tang | Zendy; JyhFu Lee | Zendy; Christina Bock | Zendy; KueiHsien Chen | Zendy; BingJoe Hwang | Zendy

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Formation of Pt−Ru Nanoparticles in Ethylene Glycol Solution: An in Situ X-ray Absorption Spectroscopy Study

Author(s) -

Loka Subramanyam Sarma,

ChingHsiang Chen,

Sakkarapalayam Murugesan Senthil Kumar,

GuoRung Wang,

Shih-Chieh Yen,

DinGoa Liu,

HwoShuenn Sheu,

Kuan-Li Yu,

MauTsu Tang,

JyhFu Lee,

Christina Bock,

KueiHsien Chen,

BingJoe Hwang

Publication year - 2007

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la0637418

Subject(s) - x ray absorption spectroscopy , ethylene glycol , chemistry , absorption spectroscopy , nanoparticle , absorption (acoustics) , ruthenium , extended x ray absorption fine structure , spectroscopy , inorganic chemistry , catalysis , nuclear chemistry , crystallography , materials science , organic chemistry , nanotechnology , physics , quantum mechanics , composite material

The chemical state and formation mechanism of Pt-Ru nanoparticles (NPs) synthesized by using ethylene glycol (EG) as a reducing agent and their stability have been examined by in situ X-ray absorption spectroscopy (XAS) at the Pt LIII and Ru K edges. It appears that the reduction of Pt(IV) and Ru(III) precursor salts by EG is not a straightforward reaction but involves different intermediate steps. The pH control of the reaction mixture containing Pt(IV) and Ru(III) precursor salts in EG to 11 led to the reduction of Pt(IV) to Pt(II) corresponding to [PtCl4](2-) whereas Ru(III)Cl3 is changed to the [Ru(OH)6](3-) species. Refluxing the mixture containing [PtCl4](2-) and [Ru(OH)6](3-) species at 160 degrees C for 0.5 h produces Pt-Ru NPs as indicated by the presence of Pt and Ru in the first coordination shell of the respective metals. No change in XAS structural parameters is found when the reaction time is further increased, indicating that the Pt-Ru NPs formed are extremely stable and less prone to aggregation. XAS structural parameters suggest a Pt-rich core and a Ru-rich shell structure for the final Pt-Ru NPs. Due to the inherent advantages of the EG reduction method, the atomic distribution and alloying extent of Pt and Ru in the Pt-Ru NPs synthesized by the EG method are higher than those of the Pt-Ru/C NPs synthesized by a modified Watanabe method.

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