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Novel hollow sub-microspheres with movable Au nanoparticles and excessive Pt nanoparticles in core and silica as shell

Authors
Journal
Materials Chemistry and Physics
0254-0584
Publisher
Elsevier
Publication Date
Volume
111
Identifiers
DOI: 10.1016/j.matchemphys.2008.04.030
Keywords
  • Nanostructure
  • Chemical Synthesis
  • Electron Microscopy
  • Electrical Properties
Disciplines
  • Design
  • Earth Science
  • Geography

Abstract

Abstract A simple route has been designed for the syntheses of a kind of electrocatalyst, i.e., hollow spheres with Au and excessive Pt nanoparticles in core and silica as shell. The [email protected] spheres synthesized by hydrothermal process can act as the transitional templates, and the carbonaceous matrix can in situ reduce H 2PtCl 6·H 2O solution and load with Pt nanoparticles, and then a slightly modified Stöber process was applied to encapsulate the structures with silica shell. Further calcination at high temperatures removed the carbon matrix to form the hollow spheres with Au and excessive Pt nanoparticles in core and silica as shell. This new kind of structures shows excellent electrocatalytic properties compared with that of similar hollow spheres but only with pure Pt nanoparticles inside, and it might provide an efficient way to improve the electrocatalytic property of a bulk Pt/GC electrode.

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