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A method for preparing boron-nitrogen co-doped graphitized nano-carbon with biomass as carbon source

A nano-carbon and graphitization technology, applied in nano-carbon, graphene, nanotechnology and other directions, can solve the problems of low boron and nitrogen content, high cost, complex preparation process, etc., achieve uniform product morphology and properties, reduce synthesis Cost, the effect of simple preparation process

Active Publication Date: 2015-12-02
HEILONGJIANG UNIV
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  • Abstract
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Problems solved by technology

[0005] The present invention aims to solve the problems that the existing boron-nitrogen co-doped graphitized nano-carbon has complex preparation process, harsh reaction conditions, low boron and nitrogen content, low yield and high cost, thus making it difficult to realize industrialized production, and provides a production method Method for preparing boron-nitrogen co-doped graphitized nano-carbon with substance as carbon source

Method used

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  • A method for preparing boron-nitrogen co-doped graphitized nano-carbon with biomass as carbon source
  • A method for preparing boron-nitrogen co-doped graphitized nano-carbon with biomass as carbon source

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specific Embodiment approach 1

[0016] Specific embodiment one: In this embodiment, a method for preparing boron-nitrogen co-doped graphitized nano-carbon using biomass as a carbon source is specifically carried out according to the following steps:

[0017] 1. Using chemical methods to pretreat biomass;

[0018] 2. Add the biomass treated in step 1 into the solvent, then add a compound containing boron element, a compound of nitrogen element and a graphitization catalyst, and then stir at a temperature of 25°C to 60°C and a stirring speed of 80r / min to 200r Stir for 2h to 10h under the condition of 1 / min, then evaporate the solvent to dryness at a temperature of 80°C to 110°C to obtain the precursor;

[0019] 3. Carbonization treatment: Under the protection of inert gas, the precursor obtained in step 2 is controlled at a heating rate of 2°C / min to 15°C / min, and the temperature is raised to 600°C to 1200°C, and the holding time is 30min to 300min to obtain a carbonized product ;

[0020] 4. Acid treatment...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the pretreatment steps described in step one are as follows: the biomass is added to an aqueous solution of potassium hydroxide with a mass fraction of 10% to 35%, the mass fraction 10%-35% sodium hydroxide aqueous solution, 10%-35% hydrochloric acid aqueous solution, 10%-35% nitric acid aqueous solution or 10%-35% high manganese In the aqueous solution of potassium acid potassium, activate at an activation temperature of 90°C to 190°C for 3h to 8h to complete the pretreatment. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: This embodiment differs from Embodiment 1 in that the biomass described in step 1 is coconut shell, corn stalk, palm shell, bagasse, cattail grass, bamboo or sawdust. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing boron and nitrogen codoped graphitized nano carbon by taking biomass as a carbon source, and relates to a synthetic method of boron and nitrogen codoped graphitized nano carbon. The method aims at solving the problem that industrial production is difficult to achieve due to the fact that the existing preparation technology of boron and nitrogen codoped graphitized nano carbon is complicated, reaction conditions are harsh, the contents of boron and nitrogen are low, the yield is low, and the cost is high. The method comprises the steps of 1, pretreatment, 2, precursor preparation, 3, carbonization treatment and 4, acid treatment. The method adopts the rich biomass in nature as the carbon source, so that a preparation technology is simple, and the synthetic cost of a material is lowered; by changing a material ratio of raw materials, the contents of nitrogen and boron in a finished product and graphitization degrees of nitrogen and boron can be adjusted and controlled, and requirements of different fields can be met; and the biomass is uniform in component, so that functionalization ions can be dispersed in the biomass very well, and a pattern and the property of the product are uniform. The method is used for preparing boron and nitrogen codoped graphitized nano carbon by taking the biomass as the carbon source.

Description

technical field [0001] The invention relates to a synthesis method of boron-nitrogen co-doped graphitized nano-carbon. Background technique [0002] Fuel cells have the advantages of high energy density, high conversion efficiency, and environmental friendliness, so they are considered to be the most promising energy conversion devices. The oxygen reduction reaction kinetics of the cathode is relatively slow, which is the key to determine the performance of the fuel cell. So far, the noble metal Pt and Pt-based alloys are the most effective oxygen reduction catalysts. However, the commercial application of fuel cells is limited due to the high price, poor durability and scarcity of precious metal Pt. Therefore, current researchers are devoting themselves to developing inexpensive non-noble metal oxygen reduction catalysts. [0003] Non-noble metal-doped carbon materials are considered to be inexpensive and promising alternatives to noble metals for efficient oxygen reduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/184
Inventor 付宏刚王蕾赵璐穆光尹婕赵冬冬于鹏
Owner HEILONGJIANG UNIV
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