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N-doped graphene preparation method and application of N-doped graphene

A technology of nitrogen-doped graphene and graphene solution, applied in the direction of graphene, nano-carbon, etc., can solve the problems of not being able to be applied on a large scale and being expensive, and achieve the effects of low cost, good stability and simple preparation process

Active Publication Date: 2013-07-24
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

However, microbial fuel cell technology cannot be applied on a large scale so far due to many reasons, one of which is that the cathode catalyst commonly used in current research is an expensive platinum-carbon catalyst

Method used

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preparation example Construction

[0032] A preparation method of nitrogen-doped graphene, comprising the following steps:

[0033] 1) Dissolution of graphene oxide solid

[0034] Add graphene oxide solids into water and ultrasonically disperse for 30-240 minutes to form a uniformly dispersed graphene oxide solution with a concentration of 0.1-2.0 g / L;

[0035] 2) Reduction of hydrazine hydrate to obtain reduced graphene oxide solution

[0036] Put an ammonia solution with a mass fraction of 25% to 28% into the graphene oxide solution in step 1), and adjust the pH value of the graphene oxide solution to 9 to 11, and then add the graphene oxide solution with the graphene oxide solution A hydrazine hydrate solution with a volume ratio of 1:20 to 1:150 and a concentration of 1 mol / L is stirred for 30 to 60 minutes to obtain a mixed solution, and then the mixed solution is heated to 95°C and reacted for 1 hour to obtain a reduced state graphene oxide solution, and then directly cool the reduced state graphene oxi...

Embodiment 1

[0044] After adjusting the pH value of the graphene oxide solution to 10.02 with ammonia water, add a 1mol / L hydrazine hydrate solution with a volume ratio of 1:100, and then add a volume ratio of 1:25 with a mass fraction of 50% cyanide after the reduction reaction is completed. The amine aqueous solution is controlled by rotary evaporation with water temperature of 50° C., rotation rate of 100 rpm, and vacuum of 50 mbar to remove water to obtain a cyanamide-reduced graphene oxide composite material. The roasting conditions were then controlled to be a roasting temperature of 900° C., roasting for 60 min, and an argon flow rate of 50 mL / min. The product was cleaned with double distilled water and 50% ethanol solution respectively to obtain black powder nitrogen-doped graphene. In the 0.1mol / L, pH=7 phosphate buffer, the oxygen reduction electron transfer number was 3.75.

Embodiment 2

[0046] After adjusting the pH value of the graphene oxide solution to 10.02 with ammonia water, add a 1mol / L hydrazine hydrate solution with a volume ratio of 1:100, and then add a volume ratio of 1:25 with a mass fraction of 50% cyanide after the reduction reaction is completed. The amine aqueous solution is controlled by rotary evaporation with water temperature of 50° C., rotation rate of 100 rpm, and vacuum of 50 mbar to remove water to obtain a cyanamide-reduced graphene oxide composite material. The roasting conditions were then controlled to be a roasting temperature of 1000° C., roasting for 60 min, and an argon flow rate of 100 mL / min. The product was cleaned with double distilled water and 50% ethanol solution respectively to obtain black powder nitrogen-doped graphene. In the 0.1mol / L, pH=7 phosphate buffer, the oxygen reduction electron transfer number was 3.91.

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Abstract

The invention relates to an N-doped graphene preparation method and an application of an N-doped graphene. The method specially comprises steps of: preparing graphene oxide to form a solution with proper concentration, utilizing hydrazine hydrate to reduce, adding an appropriate amount of cyanamide into the solution, rotatably steaming and drying, then calcinating at high temperature, and finally cleaning and drying to form the N-doped graphene. A 4-electron oxygen reduction process can be realized through adding the graphene oxide into a neutral phosphate buffered solution, so that the N-doped graphene can be applied to microbial fuel cells as a cathode material. The N-doped graphene prepared by the method has the advantages of high catalytic activity, good stability, simple preparation technology, low cost and the like.

Description

technical field [0001] The invention relates to a preparation method and application of nitrogen-doped graphene. Background technique [0002] As a technology that can convert organic matter in water phase directly into electrical energy through biocatalysis, microbial fuel cells have received extensive attention and research. However, microbial fuel cell technology cannot be applied on a large scale so far due to many reasons, one of which is that the cathode catalyst commonly used in current research is an expensive platinum-carbon catalyst. In order to realize the practical application of microbial fuel cells, researchers have done a lot of work in developing new materials that can replace platinum-carbon catalysts. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing nitrogen-doped graphene with simple process and low cost and its application. [0004] The technical scheme that the present...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184
Inventor 刘元刘鸿杨暖侯双霞
Owner 重庆中科德馨环保科技有限公司
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