Preparation of Mesoporous Bimetallic Au-Pt with a Phase-Segregated Heterostructure Using Mesoporous Silica

Masaki Kitahara, Saori Kubara, Azusa Takai, Daisuke Takimoto, Shinpei Enomoto, Yusuke Yamauchi, Wataru Sugimoto, Kazuyuki Kuroda

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Mesoporous bimetallic Au-Pt with a phase-segregated heterostructure has been prepared by using mesoporous silica SBA-15 as a template. Au nanoparticles were prepared as a seed metal within the mesopores, and subsequently Pt was deposited, sandwiching the Au seeds. Energy-dispersive X-ray (EDX) spectral mapping showed that the framework of mesoporous bimetallic Au-Pt, prepared by removing the silica template with HF, was composed of Au nanoparticles joined with Pt nanowires. The Au/Pt ratio of the mesoporous bimetallic Au-Pt could be varied by controlling the number of Au deposition cycles. Pre-adsorbed CO (COad) stripping voltammetry of the mesoporous bimetallic Au-Pt showed that the surfaces of the joined bimetallic structure were electrochemically active. This could be attributed to the open framework structure having a high ratio of exposed bimetallic mesopore surfaces. The described preparative approach, involving a mesoporous silica template and stepwise deposition within the mesopores, enables control of the nanostructure of the bimetallic material, which is greatly promising for the further development of synthetic methodologies for bimetallic structures.

Original languageEnglish
Pages (from-to)19142-19148
Number of pages7
JournalChemistry - A European Journal
Volume21
Issue number52
DOIs
Publication statusPublished - 2015 Dec 21

Keywords

  • cyclic voltammetry
  • gold
  • mesoporous materials
  • platinum
  • template synthesis

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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