Alternately layered Au/Fe3O4 with porous structure - A self-assembled nanoarchitecture for catalysis materials

Satoshi Kameoka, Ampo Sai

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Nanoporous gold fabricated by the dealloying of binary Au alloys has a three-dimensional network of fine ligaments on the nano-scale, which is a novel unsupported gold catalyst with exceptional catalytic activity for CO oxidation. Here we report a new nanoporous structure - a composite formed by alternately layered Au/Fe3O4/Au with layer spacing ∼200 nm and with porous structure (the pore size is below 20 nm). The Au/Fe 3O4/Au revealed much higher catalytic performance for CO oxidation than the previously reported conventional Au/Fe2O 3 catalyst, where the porous Au and porous Fe3O 4 were responsible for the high activity and high thermal stability, respectively. The porous structure is formed via a self-assembly process by the dealloying of Al in a NaOH aqueous solution for a conventionally melting Al-Au-Fe alloy precursor with an alternately layered Al2Au/Al 2Fe/Al2Au structure. We show here, that a fine composite nanoporous structure could be intentionally designed on the basis of the metallurgically tailored microstructure of the precursor alloy.

Original languageEnglish
Pages (from-to)7348-7351
Number of pages4
JournalJournal of Materials Chemistry
Volume20
Issue number35
DOIs
Publication statusPublished - 2010 Sep 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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