Preparation and characterization of aqueous colloids of Pt-Ru nanoparticles.
A synthetic method for platinum-ruthenium (PtRu) nanoparticles in aqueous media is proposed. This method employs citric acid as a capping agent and NaBH(4) as a reducing agent with the aid of pH control. The number-averaged size of the PtRu nanoparticles was ca. 2 nm. The crystal phase and chemical composition of the nanoparticles was investigated by X-ray diffraction measurement and scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis, which indicated that the nanoparticles mainly consisted of an alloy of Pt and Ru. Electrochemical measurement showed that the PtRu nanoparticles had catalytic activity for methanol oxidation.
Shimazaki
Yuzuru
Y
Advanced Research Laboratory, Hitachi Ltd., 7-1-1 Omika-cho, Hitachi 319-1292, Japan.
Kobayashi
Yoshio
Y
Yamada
Shinji
S
Miwa
Takao
T
Konno
Mikio
M
D000497:Alloys / Q000138:chemical synthesis / Q000737:chemistry; D002384:Catalysis; D003102:Colloids / Q000138:chemical synthesis* / Q000737:chemistry*; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D000432:Methanol / Q000737:chemistry; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
D000497:Alloys; D003102:Colloids; D014867:Water; D010984:Platinum; D012428:Ruthenium; D000432:Methanol