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Nitrogen-doped porous carbon material as well as preparation method and application thereof

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, improving electrical conductivity and high specific surface area.

Active Publication Date: 2020-11-03
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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  • Nitrogen-doped porous carbon material as well as preparation method and application thereof
  • Nitrogen-doped porous carbon material as well as preparation method and application thereof
  • Nitrogen-doped porous carbon material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0045] A nitrogen-doped porous carbon material (denoted as F 1 -M 1 -800, where, F 1 , M 1 They are respectively potassium ferrate and magnesium chloride hexahydrate, and the molar ratio of potassium ferrate and magnesium chloride hexahydrate is 1:1, and 800 is the high-temperature calcination temperature, and the preparation method of 800° C.) specifically includes the following steps:

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

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 molar ratio of potassium ferrate and magnesium chloride hexahydrate is 1:1, 850 is the preparation method of choosing 850 ℃ for the high temperature calcination temperature), specifically comprising the following 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 magnetically stirring for 15 minutes in a water bath at 78°C, add 8.4g of melamine and 4.0g of MgCl in sequence. 2 ·6H 2 O, 3.90g potassium ferrate, continue stirring for 30 minutes, add 2.4g agarose, continue stirring for 3 hours, then pour into the petri dish to cool naturally to form a hydrogel; Cover the petri dish with a plastic wrap with small holes, and dry it at -55°C for 72 hours to obtain a white dry gel, transfer it to a porcelain boat, and place it i...

Embodiment 3

[0053] A nitrogen-doped porous carbon material (denoted as F 1 -M 1 -900, of which, F 1 , M 1 The amount of potassium ferrate and magnesium chloride hexahydrate added to each 100mL ethanol-water solution is about 0.01mol, and 900 is the high-temperature calcination temperature of 900°C). The preparation method specifically includes 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 stirring magnetically for 10 minutes at 82°C in a water bath, add 6.3g of melamine and 2.8g of MgCl in sequence. 2 ·6H 2 O, 2.73g potassium ferrate, continue stirring for 30 minutes, add 1.82g agarose, continue stirring for 2 hours, then pour into a petri dish to cool naturally to form a hydrogel; Cover the petri dish with a plastic wrap with small holes, and dry it at -50°C for 48 hours to obtain a white dry gel, which is transferred to a porcelain boat and placed in a tube furnace from...

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Abstract

The invention belongs to the technical field of porous carbon materials, and discloses a nitrogen-doped porous carbon material as well as a preparation method and application thereof. The method comprises the following steps: 1) in a mixed solvent containing water, mixing a triblock copolymer F127, an organic nitrogen source, magnesium chloride and potassium ferrate, adding agarose, uniformly mixing the components, cooling the mixture to form hydrogel, and freeze-drying the hydrogel to obtain dry gel; 2) carbonizing the dry gel to obtain a nitrogen-doped porous carbon material, wherein the carbonization treatment is to carbonize the dry gel at the temperature of 800-900 DEG C; or the carbonization treatment is that the xerogel is subjected to primary carbonization, acid treatment and secondary carbonization. The method is simple, and the obtained nitrogen-doped porous carbon material has a large specific surface area, a large number of defect sites, a high nitrogen doping amount and excellent oxygen reduction performance. The invention also discloses the application of the nitrogen-doped porous carbon material in electrocatalytic oxygen reduction reaction as an oxygen reduction reaction electrocatalyst.

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 its preparation method and application. Background technique [0002] The development of modern life and society is inseparable from energy. The energy system based on fossil fuels is facing a series of problems such as the depletion of fossil fuels and high carbon dioxide emissions. We need to find new clean renewable energy and efficient energy storage and conversion devices to Revolutionize energy systems. Supercapacitors and fuel cells are promising energy storage and conversion devices. At present, disadvantages such as high cost, short lifespan and low efficiency greatly limit the wide-scale promotion of fuel cells. Oxygen reduction reaction is a common reaction in the fuel cell cathode, which largely determines the performance and life of the fuel cell. At present, many electrocatalysts suitable for oxygen re...

Claims

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Application Information

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Patent Type & Authority Applications(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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