A Spontaneous Combustion Reaction for Synthesizing Pt Hollow Capsules Using Colloidal Carbon Spheres as Templates

Abstract

Here we report a spontaneous combustion reaction in synthesizing Pt hollow capsules. In brief, Pt nanoparticles were loaded on the surface of colloidal carbon spheres by wet-chemical impregnation. When Pt-loaded carbon spheres were taken out of an argon-filled tube furnace at room temperature and exposed to air, they underwent spontaneous combustion. The internal carbon spheres templates were removed to leave nanostructured Pt hollow capsules. There are at least two critical conditions for the occurrence of the spontaneous combustion: the Pt particle size is below 5.8 nm, and the hydrogen content in the carbon spheres is above 2.570 wt %. Such a reaction is interesting for the preparation of metal hollow spheres and is also relevant with respect to removal of accumulated carbon on catalysts and for soot oxidation at room temperature.

Hollow Micro‐/Nanostructures: Synthesis and Applications

“…Upon further reaction with NH 3 at 850 8C, the corresponding GaN hollow spheres can also be obtained. This simple method has been extended by the same authors, as well as others, to prepare hollow spheres of a wide range of metal oxides [60][61][62] and Pt hollow capsules, [63] but the quality appears less satisfactory.…”

Nanoporous carbon spheres and their application in dispersing silver nanoparticles

“…Control of the deposition process for a good dispersion, high particle density, and especially a narrow size range of NP remain to be quite difficult. Silver NPs possess unique physicochemical properties which strongly depend on their size, shape and spatial distribution [22]. To deposit silver NPs well dispersed, with high particle density, and a narrow size range onto the carbon spheres as substrates is of significance for their properties and applications such as surface-enhanced Raman scattering, modulation of optical properties, biological detection, and catalysis.…”

Research on Advanced Materials for Li‐ion Batteries

“…HCS have also been prepared by other authors from glucose and starch. [20,21] They have been used as templates for synthesis, [22] catalyst supports, [23][24][25] counter electrodes for dye-sensitized solar cells (DSSCs), [26] and as anodes for Li-ion batteries, [16][17][18][19] as shown below. Li storage in HCS shows a typical feature of hard carbon as shown in Figure 2c and 2d.…”