Single-layer and multi-layer hollow carbon nanosphere and preparation method and application thereof

A hollow carbon sphere, single-layer technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of cumbersome steps in the template method, and achieve the effect of mild reaction conditions and simple operation methods.

Active Publication Date: 2015-08-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the steps of the template method are cumbersome, including steps such as...

Method used

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  • Single-layer and multi-layer hollow carbon nanosphere and preparation method and application thereof
  • Single-layer and multi-layer hollow carbon nanosphere and preparation method and application thereof
  • Single-layer and multi-layer hollow carbon nanosphere and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0128] Embodiment A1, using method A to prepare hollow carbon spheres:

[0129] Weigh 0.1g 3-aminophenol and dissolve in 20ml H 2 O and 10ml EtOH mixed solution, add ammonia and formaldehyde solution and stir at room temperature for 1.3h.

[0130] Add 20ml of acetone to the reaction vessel, continue to stir at room temperature for 30min, centrifuge the precipitate, and wash it twice with ethanol. The obtained precipitate is fully dried in a drying oven at 80°C for 4h to obtain the intermediate product II.

[0131] The dried intermediate product II was placed in a tube furnace with a hydrogen-argon gas mixture (5 / 95% by volume), raised from room temperature to 900°C at a heating rate of 5°C / min, and calcined at 900°C After 10 hours, it was naturally cooled to room temperature to obtain a single-layer hollow carbon sphere II with a clean interior.

[0132] Finally, a single-layer hollow carbon sphere with mesoporous distribution inside is obtained, with an outer diameter of 30...

Embodiment A2

[0134] Example A2, using method A to prepare a carbon sphere structure with overall mesoporous distribution:

[0135] The difference with embodiment A1 is:

[0136] Weigh 0.1g 3-aminophenol in 16ml H 2 O and 14ml EtOH mixed solution, add ammonia and formaldehyde solution and stir at room temperature for 45min.

[0137] Finally, a carbon sphere structure with mesoporous distribution throughout is obtained, and the diameter of the sphere is 280-360 nm.

[0138] image 3 It is a transmission electron microscope (TEM) image of the carbon sphere structure with overall distribution of mesoporous cells prepared in this example. It can be seen from the figure that the scale of the hollow carbon sphere is 300-350 nm.

Embodiment A3

[0139] Embodiment A3, using method A to prepare the yolk-shell hollow structure with solid carbon spheres inside:

[0140] The difference with embodiment A1 is:

[0141] Weigh 0.4g 3-aminophenol in 20ml H 2 O and 10ml EtOH mixed solution, add 0.1ml ammonia and 0.4ml formaldehyde solution and stir at room temperature for 1.3h.

[0142] The end result is a hollow yolk-shell structure with solid carbon spheres inside. The outer diameter of the obtained hollow carbon sphere structure is 470-520nm, and the diameter of the inner solid sphere is 200-250nm.

[0143] Figure 4 The transmission electron microscope (TEM) figure of the hollow yolk-shell carbon sphere material prepared by the present embodiment is equipped with solid carbon spheres inside, as can be seen from the figure that the outer diameter of the sphere is about 500nm, and the diameter of the inner solid sphere is about 230nm.

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Abstract

The invention discovers and proposes a characteristic that interior species of phenolic resin are nonuniform in distribution in a polymerization process, and discloses a method for preparing a hollow carbon sphere by utilizing the characteristic of phenolic resin. The method comprises: (1) putting phenol into water or a solvent, adjusting the pH, then adding aldehyde and stirring at a certain temperature for a period of time; (2) adding a corrosive agent in a reaction system, stirring at a certain temperature, and selectively removing a part with a relatively low polymerization degree inside a polymer by utilizing a solubility difference of interior species for different solvents, to obtain an intermediate product, that is, a hollow sphere of phenolic resin polymer; and (3) calcining the intermediate product that is obtained in step (2) in an inertia or reducing atmosphere, naturally cooling to room temperature, and thus completing preparation of the hollow carbon sphere. The method is simple and practicable, and the prepared hollow carbon sphere is uniform in shape and controllable in dimension. Moreover, by utilizing a characteristic that the phenolic resin can be in-situ polymerized on surfaces of different nanometer particles, on one hand, a multi-layer hollow structure can be prepared in a multi-cladding and layer-by-layer corrosion manner, and on the other hand, the different nanometer particles can also be packaged in a cavity in an in-situ mode, so as to prepare a nuclear shell or egg yolk-nuclear structure. The prepared hollow carbon sphere has a potential application value in aspects of silicon-carbon negative electrode material, Li-S battery, supercapacitor, heavy metal ion adsorption, and the like.

Description

technical field [0001] The invention relates to the synthesis field of polymer materials and inorganic nano materials, in particular to a method for preparing single-layer and multi-layer hollow carbon sphere nano materials by using phenolic resin and corrosive agent. Background technique [0002] Hollow carbon sphere is a carbon material with special structure, which has high specific surface area, high porosity, excellent electrical conductivity, chemical stability and thermal stability, etc. The field has important application value. Due to its unique cavity structure, it can be used as a nanocage to accommodate different kinds of substances, so it can also be used in electrode materials, catalyst carriers, gas storage media, lubricants, substance adsorption and separation, drug sensors, drug release control, artificial cells, etc. , has a wide range of applications and has received a lot of attention. [0003] At present, there are various methods for preparing hollow ...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00B82Y40/00
Inventor 曹安民池子翔万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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