Open Access
Research Article

Nano Research

, Volume 2, Issue 12, pp 975-983

Interfacial activation of catalytically inert Au (6.7 nm)-Fe3O4 dumbbell nanoparticles for CO oxidation

Authors

  • Binghui Wu
    • State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen University
  • Hai Zhang
    • State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen University
  • Cheng Chen
    • State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen University
  • Shuichao Lin
    • State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen University
    • State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical EngineeringXiamen University

DOI: 10.1007/s12274-009-9102-z

Abstract

Au nanoparticles epitaxially grown on Fe3O4 in Au (6.7 nm)-Fe3O4 dumbbell nanoparticles exhibit excellent stability against sintering, but display negligible catalytic activity in CO oxidation. Starting from various supported Au (6.7 nm)-Fe3O4 catalysts prepared by the colloidal deposition method, we have unambiguously identified the significance of the Au-TiO2 interface in CO oxidation, without any possible size effect of Au. In situ thermal decomposition of TiO2 precursors on Au-Fe3O4 was found to be an effective way to increase the Au-TiO2 interface and thereby optimize the catalytic performance of TiO2-supported Au-Fe3O4 dumbbell nanoparticles. By reducing the size of Fe3O4 from 15.2 to 4.9 nm, the Au-TiO2 contact was further increased so that the resulting TiO2-supported Au (6.7 nm)-Fe3O4 (4.9 nm) dumbbell particles become highly efficient catalysts for CO oxidation at room temperature.
https://static-content.springer.com/image/art%3A10.1007%2Fs12274-009-9102-z/MediaObjects/12274_2009_9102_Fig1_HTML.jpg

Keywords

Gold nanocatalysts support effect CO oxidation Au-Fe3O4 dumbbell nanoparticles

Supplementary material

12274_2009_9102_MOESM1_ESM.pdf (336 kb)
Supplementary material, approximately 101 KB.

Copyright information

© Tsinghua University Press and Springer Berlin Heidelberg 2009