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

作者：Min Yu Lin; Wan Yong; Liu Rong; Yu Shu Hong^*

来源：Materials Chemistry and Physics, 2008, 111(2-3): 364-367.

DOI：10.1016/j.matchemphys.2008.04.030

• nanostructure
• chemical synthesis
• electron microscopy
• electrical properties

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 Au@carbon spheres synthesized by hydrothermal process can act as the transitional templates, and the carbonaceous matrix can in situ reduce H2PtCl6 center dot H2O solution and load with Pt nanoparticles, and then a slightly modified Stober 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.

• 出版日期2008-10-15
• 单位中国科学技术大学