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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)2229-2234
Number of pages6
JournalJournal of Materials Chemistry
Volume16
Issue number23
DOIs
Publication statusPublished - 2006

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Crystalline materials
Liquids
synthesis
liquids
Intermetallics
intermetallics
X rays
Atoms
Electrons
Photoelectrons
Platinum
Nickel
Specific surface area
Lattice constants
atoms
Energy dispersive spectroscopy
Nanostructures
lattice parameters
photoelectrons
platinum

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Synthesis and characterization of mesoporous Pt-Ni (HI-Pt/Ni) alloy particles prepared from lyotropic liquid crystalline media. / Yamauchi, Yusuke; Sadasivan Nair, Sivakumar; Momma, Toshiyuki; Ohsuna, Tetsu; Osaka, Tetsuya; Kuroda, Kazuyuki.

In: Journal of Materials Chemistry, Vol. 16, No. 23, 2006, p. 2229-2234.

Research output: Contribution to journalArticle

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AU - Ohsuna, Tetsu

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AU - Kuroda, Kazuyuki

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