Preparation and characterization of aqueous colloids of Pt-Ru nanoparticles

Yuzuru Shimazaki, Yoshio Kobayashi, Shinji Yamada, Takao Miwa, Mikio Konno

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


A synthetic method for platinum-ruthenium (PtRu) nanoparticles in aqueous media is proposed. This method employs citric acid as a capping agent and NaBH4 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.

Original languageEnglish
Pages (from-to)122-126
Number of pages5
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - 2005 Dec 1


  • Alloy
  • Colloid
  • Direct methanol fuel cell
  • Nanoparticle
  • XRD

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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