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Figure 1 Schematic representation of the nanostructures of the star-shaped Ag-Pt bicomponent. The competitive growth of Pt at different sites on the surface of Ag twin particles results in the final display of star-like structures in the two-component nanoparticles.
Fig. 2 Transmission and high-resolution transmission electron microscopy images of Pt growing on the surface of Ag twin particles over time. At the initial stage, only Ag particles form, and as time increases, competitive growth occurs at certain highly active sites, eventually forming a star Pt nanostructure coated on the surface of Ag core particles.
The unique properties and excellent properties of noble metal nanomaterials are closely related to their topography composition and internal structure. In addition to the characteristics of nanoparticles, the dual-component precious metal nanomaterials with complex structure also have effects such as electron coupling and lattice strain caused by the internal structure, and regulate the morphology of the two-component noble metal nanomaterials, and it is expected to realize its The control of performance further realizes the multifunctionality of nanomaterials.
Recently, the research team of Yang Jun, a member of the State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, successfully prepared a star-shaped Ag-Pt binary noble-metal heterostructure nanomaterial (Bimetallic Ag-Pt nanoparticles with stellated). Morphologies). The two-component noble metal heterostructure nanomaterial is the result of competitive growth of Pt on the grain boundary of multiple twin Ag.
The method can be further extended to selectively remove core Ag particles to obtain Hollow structured Pt nanoparticles with stellated morphologies. This special nanostructured material contains not only a large number of highly active Pt step and corner atoms, but also a highly active Pt{111} crystal plane, and an electronic coupling effect of an adjustable Ag core and a Pt shell. The special structure of the morphological structure and the common influence of the physical effects of different components make the material show good catalytic activity in the catalytic oxidation of methanol and oxygen reduction. The results of this study were published in the journal Scientific Reports of the Nature Publishing Group (Scientific Reports, 2014, 4, 3969/1−3969/7).
Further studies have found that if the Au particles are replaced with twinned Au particles as the core, they can develop into a more universal technique to prepare binary dendritic heterostructure nanoparticles, such as Au-Pt, Au-Pd, Au- Ru, Au-Ir and so on. The results of this study were invited to be published in a special edition of the "2014 Emerging Investigators Themed Issue" organized by the journal's Journal of Materials Chemistry A (2014, 2, 6130-6137).
The above-mentioned related research has been funded by the National Key Laboratory Fund for the Multiphase Complex System of the "Hundred Talents Program," the National Natural Science Foundation, and the Institute of Process Engineering.
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