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A nitrogen-doped porous carbon material and its preparation method and application

A nitrogen-doped porous carbon and carbonization technology is applied in the field of porous carbon materials, which can solve the problem that the catalytic performance of oxygen reduction needs to be improved, and achieve the effects of improving oxygen reduction performance, increasing the degree of graphitization, and high specific surface area.

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the existing carbon materials are used as electrocatalysts for the oxygen reduction reaction, their oxygen reduction catalytic performance still needs to be improved.

Method used

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  • A nitrogen-doped porous carbon material and its preparation method and application
  • A nitrogen-doped porous carbon material and its preparation method and application
  • A nitrogen-doped porous carbon material and its preparation method and application

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Embodiment 1

[0045] A nitrogen-doped porous carbon material (denoted as F 1 -M 1 -800, where F 1 ,M 1 Be respectively potassium ferrate and magnesium chloride hexahydrate, and the mol ratio of potassium ferrate and magnesium chloride hexahydrate is 1:1, 800 is the preparation method of high temperature calcination temperature (800 ℃), specifically comprises the following steps:

[0046] Weigh 1.5g F127 (EO 106 PO 70 EO 106 ) was added to the ethanol-aqueous solution prepared with 50 mL of water and 50 mL of ethanol, and after magnetic stirring in a water bath at 80°C for 10 minutes, 4.0 g of melamine and 2.0 g of MgCl were added in sequence. 2 ·6H 2O, 1.95g potassium ferrate, add 1.4g agarose after continuing to stir for 40 minutes, pour into a petri dish and naturally cool to form a hydrogel after continuing to stir for 2.5 hours; Cover the petri dish with plastic wrap with small holes, freeze-dried at -50°C for 60 hours to obtain a white dry gel, transfer it to a porcelain boat, a...

Embodiment 2

[0049] A nitrogen-doped porous carbon material (denoted as F 1 -M 1 -850, where F 1 ,M 1 , 850 are respectively potassium ferrate and magnesium chloride hexahydrate, and the mol ratio of potassium ferrate and magnesium chloride hexahydrate is 1:1, 850 is the preparation method of high temperature calcination temperature (850 ℃), specifically comprises the steps:

[0050] Weigh 2.8g of F127 and add it to the ethanol-water solution prepared with 120mL of water and 80mL of ethanol. After magnetic stirring in a water bath at 78°C for 15 minutes, add 8.4g of melamine and 4.0g of MgCl in sequence. 2 ·6H 2 O, 3.90g potassium ferrate, add 2.4g agarose after continuing to stir for 30 minutes, pour into a petri dish and naturally cool to form a hydrogel after continuing to stir for 3 hours; Cover the petri dish with plastic wrap with small holes, freeze-dried at -55°C for 72 hours to obtain a white dry gel, transfer it to a porcelain boat, and place it in a tube furnace from room te...

Embodiment 3

[0053] A nitrogen-doped porous carbon material (denoted as F 1 -M 1 -900, where F 1 ,M 1 The amount of substances that are respectively added to potassium ferrate and magnesium chloride hexahydrate in every 100mL of ethanol-water solution is about 0.01mol, and 900 is the preparation method of high temperature calcination temperature (900 ° C), specifically comprising the following steps:

[0054] Weigh 2.1g of F127 (Pluronic F127) and add it to the ethanol-water solution prepared with 80mL of water and 60mL of ethanol. After magnetic stirring for 10 minutes in a water bath at 82°C, add 6.3g of melamine and 2.8g of MgCl in sequence. 2 ·6H 2 O, 2.73g potassium ferrate, add 1.82g agarose after continuing to stir for 30 minutes, pour into a petri dish and naturally cool to form a hydrogel after continuing to stir for 2 hours; then place the above hydrogel in a freeze-drying box, use a Cover the petri dish with plastic wrap with small holes, freeze-dried at -50°C for 48 hours t...

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Abstract

The invention belongs to the technical field of porous carbon materials, and discloses a nitrogen-doped porous carbon material, a preparation method and application thereof. The method: 1) in a mixed solvent containing water, mix the triblock copolymer F127, an organic nitrogen source, magnesium chloride and potassium ferrate, add agarose and mix evenly, cool to form a hydrogel, freeze-dry, and obtain dry Gel; 2) Carbonizing the xerogel to obtain a nitrogen-doped porous carbon material; the carbonization treatment is carbonizing the xerogel at 800-900°C; or the carbonization treatment is carbonizing the xerogel once , acid treatment, secondary carbonization. The method of the invention is simple, and the obtained nitrogen-doped porous carbon material has larger specific surface area, more defect sites and higher nitrogen doping amount, and has excellent oxygen reduction performance. The application of the nitrogen-doped porous carbon material in the electrocatalytic oxygen reduction reaction is used as an electrocatalyst for the oxygen reduction reaction.

Description

technical field [0001] The invention belongs to the field of porous carbon materials, and in particular relates to a nitrogen-doped porous carbon material and a preparation method and application thereof. Background technique [0002] The development of modern life and society is inseparable from energy. The fossil fuel-based energy system is facing a series of problems such as the depletion of fossil fuels and high carbon dioxide emissions. We need to find new clean and renewable energy and efficient energy storage and conversion devices. Revolutionizing the energy system. Supercapacitors and fuel cells are promising energy storage and conversion devices. At present, the disadvantages of high cost, insufficient life and low efficiency greatly limit the wide-scale promotion of fuel cells. Oxygen reduction reaction is a common reaction of fuel cell cathode, which largely determines the performance and life of fuel cell. At present, many electrocatalysts suitable for oxygen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05H01M4/96
CPCC01B32/05H01M4/96Y02E60/50
Inventor 王秀军潘俞安邵春风李白滔
Owner SOUTH CHINA UNIV OF TECH
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