Corking and uncorking a catalytic yolk-shell nanoreactor: Stable gold catalyst in hollow silica nanosphere

Chen Han Lin, Xiaoyan Liu, Si Han Wu, Kao Hsiang Liu, Chung Yuan Mou

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Abstract

Silica templating of a water-in-oil (w/o) microemulsion system containing HAuCl4 results in gold nanoparticles of sizes around 3 nm confined in hollow silica nanospheres. The size of the gold nanocatalyst is stable to high temperature calcination. Its catalytic activity toward CO oxidation is very stable after repeated use and long-time storage. The reaction can be controlled by a corking design based on capillary condensation of water vapor for corking the mesopores on the shell. At higher temperature or low water vapor pressure, pores open after vapor evaporation and water promotes the CO oxidation. The corking and uncorking mechanism of the yolk-shell type nanoreactor is reversible.

Original languageEnglish
Pages (from-to)2984-2988
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume2
Issue number23
DOIs
Publication statusPublished - Dec 1 2011
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)

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