期刊
NANO RESEARCH
卷 2, 期 5, 页码 406-415出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-009-9040-9
关键词
Nanostructure; alloy; platinum; gold; formic acid oxidation; electrocatalyst; polymer electrolyte membrane fuel cell (PEMFC)
类别
资金
- U.S. National Science Foundation [DMR-0449849]
- NSF
Bimetallic PtAu heteronanostructures have been synthesized from Pt-on-Au nanoparticles, which were made from platinum acetylacetonate and gold nanoparticles. Using the Pt-on-Au nanoparticles as precursors, Pt-surface rich PtAu bimetallic heteronanostructures can be produced through controlled thermal treatments, as confirmed by field emission high-resolution transmission electron microscopy (HR-TEM) and elemental mapping using a high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM). Oxidation of formic acid was used as a model reaction to demonstrate the effects of varying composition and surface structure on the catalytic performance of PtAu bimetallic nanostructures. Cyclic voltammetry (CV) showed that these carbon-supported PtAu heteronanostructures were much more active than platinum in catalyzing the oxidation of formic acid, judging by the mass current density. The results showed that post-synthesis modification can be a very useful approach to the control of composition distributions in alloy nanostructures.
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