Method for preparing hollow carbon nano cage through burning

A hollow carbon and nano cage technology, applied in nano carbon, nano technology, nano technology and other directions, can solve problems such as unfriendly reagents, toxic environment, complex control, etc., and achieve the effects of low raw material price, simple equipment and large specific surface area.

Inactive Publication Date: 2014-05-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods require expensive equipment and require complex and precise control, and often require toxic or environmentally unfriendly reagents, so it is urgent to develop new preparation methods

Method used

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  • Method for preparing hollow carbon nano cage through burning
  • Method for preparing hollow carbon nano cage through burning
  • Method for preparing hollow carbon nano cage through burning

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preparation example Construction

[0025] All the reagents used in the process of preparing the hollow carbon nanocage of the present invention are environment-friendly reagents, the generated magnesium salt solution can be recycled, the equipment required for the whole process is simple, the raw material price is low, the process is environmentally friendly and pollution-free, and can be produced in large quantities. It is a new preparation method of carbon nanocage.

[0026] The hollow carbon nanocage prepared by the present invention may contain, in addition to carbon, magnesium, nitrogen, and / or other elements compatible with the aqueous solution, such as boron and / or sulfur.

[0027] Moreover, the shell layer of the hollow carbon nanocage prepared by the present invention has a mesoporous structure and has the advantages of large specific surface area and the like. Its pore volume can be 0.5~1.5cm 3 g -1 , the specific surface area can be 200-500m 2 g -1 . figure 1 and figure 2 The SEM photos and TE...

Embodiment 1

[0030] Add a small amount of water to a sealable container, filled with enough carbon dioxide. 5 grams of magnesium bars were ignited in air and quickly placed in the above container. After the magnesium strips are completely burned, the ash that falls into the water is collected by centrifugation. Put the obtained ash in a beaker, add 10ml of 0.5mol / L hydrochloric acid and stir it magnetically. After reacting for 24 hours, the black solid was centrifuged, washed and dried to obtain a hollow carbon nanocage doped with nitrogen, wherein the doping amount of nitrogen was 0.5 at.%. The aqueous solution of the magnesium salt containing excess hydrochloric acid can be recycled for another use. The prepared sample has good oxygen reduction performance, and its CV curve in oxygen / nitrogen saturated potassium hydroxide solution is as follows: image 3 Shown in Figure a. Its SEM photos and TEM photos are as follows figure 1 , 2 As shown in Figure a, it can be seen that it has a l...

Embodiment 2

[0032]Add 10 mL of boric acid aqueous solution into a sealable container, where the concentration of boric acid is 0.1 mol / L, filled with enough carbon dioxide. 5 grams of magnesium bars were ignited in air and quickly placed in the above container. After the magnesium strips are completely burned, the ash falling into the aqueous solution is collected by centrifugation. Put the obtained ash in a beaker, add 10ml of 0.5mol / L hydrochloric acid and stir it magnetically. After reacting for 24 hours, centrifuge the black solid therein, wash and dry to obtain a hollow carbon nanocage doped with nitrogen and boron elements, wherein the doping amount of nitrogen element is 0.3 at.%, and the doping amount of boron element is 0.3 at.%. is 0.8 at.%. The aqueous solution of the magnesium salt containing excess hydrochloric acid can be recycled for another use. The prepared sample has good oxygen reduction performance, and its CV curve in oxygen / nitrogen saturated potassium hydroxide s...

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Abstract

The invention relates to a method for preparing a hollow carbon nano cage through burning. The method comprises the steps of placing burning magnesium in a carbon dioxide atmosphere so that the magnesium reacts with the carbon dioxide, collecting ash obtained from burning, adding acid, stirring and reacting to remove magnesium oxide, washing and drying to obtain the hollow carbon nano cage. The method can be used for preparing the hollow carbon nano cage by taking magnesium oxide obtained by burning the magnesium in the carbon dioxide, preparing solid carbon nanoparticles on a magnesium oxide template obtained by burning carbon generated from a reaction between carbon source, i.e., carbon dioxide, and magnesium in the carbon dioxide in an in-situ attachment manner, and removing the magnesium oxide template through acid. All materials adopted in the process are environment-friendly reagents and generated magnesium salt solution can be recovered; the entire process is simple in equipment required, low in raw material cost, environmental friendly and pollution-free in the process, and suitable for preparation on a large scale.

Description

technical field [0001] The invention relates to carbon materials, in particular to a hollow carbon nanometer material, its preparation method and its application in the fields of oxygen reduction and the like. Background technique [0002] Mesoporous materials have large specific surface area, large pore volume and uniform pore structure, and have been widely studied in many fields such as catalysis, adsorption separation and electrode materials. Due to its large cavity and mesoporous structure, hollow carbon nanocages have many unique physical and chemical properties, which have attracted extensive attention of researchers. At present, the main methods for preparing hollow carbon nanocages include arc method, laser evaporation method, plasma polymerization method, chemical vapor deposition (CVD), supercritical fluid method, etc. These methods require expensive equipment and complex and precise control, and often require toxic or environmentally unfriendly reagents, so it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00B82Y40/00B01J21/18H01M4/90C01B32/15
CPCY02E60/50
Inventor 陈立松崔香枝吴玫颖施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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