Egg yolk‑eggshell structure au@hollow carbon nanosphere composite material and its preparation and application

Abstract

The invention discloses a yolk-eggshell structure Au@ hollow carbon nanosphere composite material and preparation and application thereof. A preparation method includes the following steps that sodium citrate is adopted for reducing chlorogoldacid, and nanogold hydrosol is prepared; the nanogold hydrosol, organic monomers, water and a Triton X-100 aqueous solution are stirred and mixed; then, an initiating agent is added into a system to initiate polymerization of the monomers, and precursors are prepared; the organic monomers are composed of aniline and pyrrole; and under the inert atmosphere, the precursors are processed in a high-temperature carbonizing manner so that the yolk-eggshell structure Au@ hollow carbon nanosphere composite material can be prepared. According to the preparation method, the tedious steps that a template is prepared, complicated surface modification is needed and the template is removed are not needed, and preparation is easy and convenient. The specific surface area and the size of the prepared material can be regulated and controlled through the carbonization condition and the concentration of the organic monomers, the specific surface area is high, and the prepared material has a good catalytic effect on nitrobenzene and p-nitrophenol.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to an egg yolk-eggshell structure Au@hollow carbon nanosphere composite material and its preparation and application. Background technique [0002] Egg yolk-eggshell nanocomposites, especially precious metal@hollow carbon nanospheres, are an important class of advanced materials, with unique nanoshells and noble metal nanoparticles loaded in nanohollow cavities, which are useful in catalysis, energy, and nanotechnology. It has broad application prospects in reactors, environment, biomedicine and other fields. [0003] So far, egg yolk-eggshell structure noble metal@hollow carbon nanospheres are usually prepared by template method, which includes the preparation of noble metal nanoparticles, step-by-step coating of protein template layer and carbon source shell layer, subsequent carbonization and template removal . However, the template method generally has the follow...

AI Technical Summary

Problems solved by technology

However, the template method generally has the following insurmountable shortcomings: (1) Complex surface modification is required: when introducing noble metal yolk cores, surface chemical modification is required to solve the interface compatibility problems of yolk cores / templates and templates / carbon precursors; ( 2) Requires cumbersome template removal: the experimental operation of removing the hard template is cumbersome, sometimes even dangerous and pollutes the environment (such as etching SiO with HF 2 protein template); (3) most carbon shell precursors (usually polymers) have poor char formation and require complex chemical cross-linking; (4) the porosity of the resulting carbon shell is usually low, and the mass transfer resistance Larger, not conducive to the function of the noble metal yolk nucleus

These shortcomings seriously hinder the basic application research and industrialization process of this kind of nanocomposite materials.

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