Synthesis and characterization of mesoporous Pt-Ni (HI-Pt/Ni) alloy particles prepared from lyotropic liquid crystalline media

Yusuke Yamauchi, Sivakumar Sadasivan Nair, Toshiyuki Momma, Tetsu Ohsuna, Tetsuya Osaka, Kazuyuki Kuroda*

*この研究の対応する著者

研究成果査読

34 被引用数 (Scopus)

抄録

Mesoporous intermetallic Pt-Ni alloys with various compositions have been produced by the chemical reduction of two metal (nickel and platinum) salts dissolved in aqueous domains of a lyotropic liquid crystalline (LLC) phase. The mesoporous Pt-Ni alloys are small particles less than 100 nm in size and exhibit high specific surface areas higher than 40 m2 g -1. The ordering of the mesostructure decreases with increasing Ni content in the alloys. The high resolution scanning electron microscopic (HR-SEM) images show that the porous nanostructures are indeed formed over the entire area on the external surface of the particles. The lattice parameters of the alloys decrease with the increasing Ni content, implying the incorporation of Ni. The X-ray photoelectron spectroscopic (XPS) data show that Ni atoms in the alloys are thought to be in the zerovalent metallic state (Ni0). The transmission electron microscopic (TEM) images prove that the lattice fringes assigned to a fcc structure are randomly oriented in the pore walls. The energy-dispersive X-ray spectroscopic (EDS) mapping shows uniform distribution of Ni atoms in the porous matrix. These results indicate the formation of mesoporous intermetallic Pt-Ni alloys.

本文言語English
ページ(範囲)2229-2234
ページ数6
ジャーナルJournal of Materials Chemistry
16
23
DOI
出版ステータスPublished - 2006

ASJC Scopus subject areas

  • 化学 (全般)
  • 材料化学

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