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Nitrogen-iron co-doped graphite carbon and preparation method and application thereof

A co-doping, graphitic carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as insufficient conductivity of catalysts, achieve favorable electron transfer, enrich oxygen reduction reaction active sites, Equipment simple effect

Inactive Publication Date: 2020-09-08
HUI ZHOU BTR NEW MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the work on porous carbons with co-doped nitrogen, metal elements and graphitized domains has been rarely reported.
[0006] Based on the problem of insufficient electrical conductivity of metal and nitrogen co-doped catalysts, the present invention proposes a metal and nitrogen co-doped graphitic carbon that is conducive to electron conduction in the catalyst and its preparation method, and uses it as an oxygen reduction catalyst

Method used

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  • Nitrogen-iron co-doped graphite carbon and preparation method and application thereof
  • Nitrogen-iron co-doped graphite carbon and preparation method and application thereof
  • Nitrogen-iron co-doped graphite carbon and preparation method and application thereof

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Embodiment 1

[0049] The present embodiment provides a preparation method of nitrogen-iron co-doped graphite carbon, comprising the steps of:

[0050] S1: pretreating biomass raw material straw to obtain dry straw powder;

[0051] The pretreatment steps are as follows: wash the straw with clean water, cut it short after drying, and then put it into a ball mill for ball milling. The ball-to-material ratio is 10:1, the rotating speed is 200 rpm, and the ball milling time is 1 hour. After finishing the ball milling process, the obtained straw powder is washed, and blow-dried in a drying oven environment at 120° C. to obtain dry straw powder, and the length of the formed straw powder is 1 mm.

[0052] S2: Take 5g of potassium ferrate, 10g of straw powder and 40g of urea according to the ratio of potassium ferrate, urea and straw powder in a mass ratio of 0.5:4:1, add an appropriate amount of water to dissolve, stir well, and place in an oven Heat and dry at 50°C until the water in the mixture ...

Embodiment 2

[0065] The present embodiment provides a preparation method of nitrogen-iron co-doped graphite carbon, comprising the steps of:

[0066] S1: Pretreat fresh biomass raw material straw to obtain dry straw powder;

[0067] The pretreatment steps are as follows: wash the straw with clean water, cut it short after drying, and then put it into a ball mill for ball milling. The ball-to-material ratio is 10:1, the rotating speed is 200 rpm, and the ball milling time is 1 hour. After finishing the ball milling process, the obtained straw powder is washed, and blow-dried in a drying oven environment at 120° C. to obtain dry straw powder, and the length of the formed straw powder is 1 mm.

[0068] S2: Take 2g of potassium ferrate, 5g of straw powder and 15g of urea according to the ratio of potassium ferrate, urea and straw powder in a mass ratio of 0.4:3:1, add an appropriate amount of water to dissolve, stir well, and place in an oven Heat and dry at 40°C until the water in the mixtur...

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Abstract

The invention belongs to the technical field of new materials, and particularly relates to nitrogen-iron co-doped graphite carbon and a preparation method and application thereof. The preparation method comprises the following steps: S1, pretreating a biomass raw material to obtain dried biomass microparticles; S2, mixing the biomass microparticles with potassium ferrate and urea, adding water, stirring to dissolve and permeate potassium ferrate and urea into the inner layers of the biomass microparticles, and heating and drying; S3, putting the mixture dried in the step S2 into a reaction container, and carrying out carbonization reaction in a protective gas atmosphere; and S4, soaking the intermediate product obtained in the carbonization reaction in the S3 in a dilute acid solution, andremoving impurities to obtain the final product nitrogen-iron co-doped graphite carbon. Equipment required by the preparation method is simple, and the prepared product is good in reproducibility andeasy to operate. The obtained nitrogen-iron co-doped graphite carbon has rich oxygen reduction reaction active sites and can be used as an oxygen reduction catalyst.

Description

technical field [0001] The invention belongs to the technical field of new materials, and specifically relates to a preparation method of nitrogen-iron co-doped graphite carbon, the nitrogen-iron co-doped graphite carbon obtained by the preparation method and its application as an oxygen reduction catalyst. Background technique [0002] The oxygen reduction reaction determines the cathode efficiency of fuel cells and metal-air batteries, and catalysts are needed to reduce the reaction overpotential and accelerate the kinetic process. Traditional noble metals such as platinum and platinum alloys are currently the most effective catalysts, but they face disadvantages such as high price, scarce resources, easy agglomeration and easy poisoning in the working process, which seriously limit their large-scale commercial application. Therefore, it is of great industrial significance to develop efficient and inexpensive new catalysts for oxygen reduction to replace noble metals. [...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/90B01J27/24B01J35/00B01J35/10
CPCC01B32/205H01M4/90B01J27/24B01J35/33B01J35/618B01J35/64B01J35/638B01J35/647Y02E60/50
Inventor 李健鹏王培初黄海肖定书
Owner HUI ZHOU BTR NEW MATERIAL TECH
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