Dumbbell-like Pt−Fe3O4 Nanoparticles and Their Enhanced Catalysis for Oxygen Reduction Reaction

Monodisperse dumbbell-like Pt−Fe3O4 nanoparticles are synthesized by epitaxial growth of Fe onto Pt nanoparticles followed by Fe oxidation. The nanoparticle size in the structure is tunable from 2 to 8 nm for Pt and 6 to 20 nm for Fe3O4. Pt nanoparticles in the Pt−Fe3O4 structure show a 20-fold incr...

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Bibliographic Details
Published in:Nano letters 2009-04, Vol.9 (4), p.1493-1496
Main Authors: Wang, Chao, Daimon, Hideo, Sun, Shouheng
Format: Article
Language:English
Subjects:
Catalytic methods
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of nanofabrication
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
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Summary:Monodisperse dumbbell-like Pt−Fe3O4 nanoparticles are synthesized by epitaxial growth of Fe onto Pt nanoparticles followed by Fe oxidation. The nanoparticle size in the structure is tunable from 2 to 8 nm for Pt and 6 to 20 nm for Fe3O4. Pt nanoparticles in the Pt−Fe3O4 structure show a 20-fold increase in mass activity toward oxygen reduction reaction compared with the single component Pt nanoparticles and the commercial 3 nm Pt particles. The work proves that it is possible to maximize catalytic activity of the Pt nanoparticle catalyst through the control not only of Pt size and shape but also of its interaction with Fe3O4 nanoparticles.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl8034724