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Preparation method and product of heteroatom-doped graphene/carbon-based material with core-shell structure

A carbon-based material, core-shell structure technology, applied in the field of materials, can solve the problems of graphene oxide structure collapse, reduce material catalytic performance, complicated steps, etc., achieve high oxygen reduction catalytic activity, improve oxygen reduction performance, and simple preparation process Effect

Active Publication Date: 2018-09-21
重庆中科德馨环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst material prepared by the hard template method has a high specific surface area and good catalytic performance, but the template needs to be removed by strong acid corrosion during the preparation process, the steps are cumbersome and the cost is high; although the soft template method overcomes the template removal in the hard template method However, the structure of graphene oxide will collapse during the preparation process, which will reduce the catalytic performance of the material

Method used

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  • Preparation method and product of heteroatom-doped graphene/carbon-based material with core-shell structure
  • Preparation method and product of heteroatom-doped graphene/carbon-based material with core-shell structure
  • Preparation method and product of heteroatom-doped graphene/carbon-based material with core-shell structure

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Effect test

Embodiment 1

[0052] Preparation of heteroatom-doped graphene / carbon-based materials with core-shell structure

[0053] (1) Ultrasonic dispersion of conductive carbon black in cetyltrimethylammonium bromide solution to obtain conductive carbon black dispersion, wherein, cetyltrimethylammonium bromide solution The massfraction of ammonium bromide is 0.005%;

[0054] (2) graphene oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion;

[0055] (3) After the conductive carbon black dispersion obtained in step (1) is mixed with the graphene oxide dispersion obtained in step (2), a mixed solution is obtained, and the mass ratio of graphene oxide and conductive carbon black in the mixed solution 10:1;

[0056] (4) Add mass fraction to the mixed solution obtained in step (3) and be 50% cyanamide aqueous solution, after stirring evenly, be 60-110mbar in space, the temperature is rotary evaporation under the condition of 60 ℃, finally at 95 ℃ Under drying 8h, make cyanam...

Embodiment 2

[0066] Preparation of heteroatom-doped graphene / carbon-based materials with core-shell structure

[0067] (1) Ultrasonic dispersion of acetylene black in the benzalkonium bromide solution to obtain the acetylene black dispersion, wherein the mass fraction of benzalkonium bromide in the benzalkonium bromide solution is 0.002%;

[0068] (2) graphene oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion;

[0069] (3) After the acetylene black dispersion obtained in step (1) is mixed with the graphene oxide dispersion obtained in step (2), a mixed solution is obtained, and the mass ratio of graphene oxide and acetylene black in the mixed solution is 20 :1;

[0070] (4) adding mass fraction in the mixed liquor obtained in step (3) is the sodium sulfate solution of 40%, after stirring evenly, it is 60-110mbar at air space, and the temperature is rotary evaporation under the condition of 45 ℃, finally at 85 ℃ Drying at lower temperature for 10h makes sodi...

Embodiment 3

[0078] Preparation of heteroatom-doped graphene / carbon-based materials with core-shell structure

[0079] (1) Ultrasonic dispersion of activated carbon in octadecyl dimethyl benzyl quaternary ammonium chloride solution to obtain activated carbon dispersion, wherein, octadecyl dimethyl benzyl quaternary ammonium chloride solution The massfraction of dimethyl benzyl quaternary ammonium chloride is 0.01%;

[0080] (2) graphene oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion;

[0081] (3) after the activated carbon dispersion obtained in step (1) is mixed with the graphene oxide dispersion obtained in step (2), a mixed solution is obtained, and the mass ratio of graphene oxide and activated carbon in the mixed solution is 5:1 ;

[0082] (4) Adding mass fraction to the mixed solution obtained in step (3) is 30% potassium phosphate solution, after stirring evenly, the air space is 60-110mbar, and the temperature is rotary evaporation at 50°C, and fin...

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Abstract

The invention relates to a preparation method and a product of a heteroatom-doped graphene / carbon-based material with a core-shell structure, and belongs to the technical field of materials. The preparation method is a template-like method; a carbon-based material serves as a core and graphene oxide serves as a shell, through a cationic surfactant serving as a bridge, the carbon-based material isconnected with the graphene oxide, finally a heteroatomic source is added, and after rotary evaporation drying, the graphene oxide is converted into heteroatom-doped graphene by the high-temperature calcination, so that the finally prepared material has a wrapped structure and is high in oxygen reduction catalytic activity and porosity. The carbon-based material in the material acts as a current collector, and the heteroatom-doped graphene uniformly distributed on the surface serves as an oxygen reduction active site, thereby ensuring that the finally prepared material is high in oxygen reduction catalytic activity and excellent in conductivity, facilitating the diffusion and transmission rate of oxygen and electrons inside a catalyst, and improving the oxygen reduction performance of thecatalyst. The material with simple preparation technology and low cost is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method and product of a heteroatom-doped graphene / carbon-based material with a core-shell structure. Background technique [0002] Microbial fuel cell (MFC) is a new technology for synchronous energy production and sewage treatment, which has attracted the attention of researchers from various countries. However, the cost of current MFC equipment is relatively high, which greatly limits its practical application. Among them, one of the main factors limiting the large-scale application of microbial fuel cell technology is the price of noble metal catalysts such as Pt / C materials used in cathode catalysts. expensive. [0003] Graphene, a new carbon nanomaterial, has been widely used in the field of electrochemistry due to its excellent properties such as good electrical conductivity and strong mechanical ductility. Among them, nitrogen-doped graphene (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M8/16
CPCH01M4/9083H01M8/16Y02E60/50Y02P70/50
Inventor 刘鸿刘智梅刘元
Owner 重庆中科德馨环保科技有限公司
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