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Cobalt nitride nanometer cubic-nitrogen doped carbon composite material, preparation method and application

A technology of cobalt nitride nanometer and nitrogen-doped carbon, which is applied in the direction of fuel cell type half cell and secondary cell type half cell, structural parts, electrical components, etc. problems, to achieve uniform morphology, high conductivity, and good stability.

Active Publication Date: 2017-02-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of poor electrical conductivity of this type of material limits the further improvement of its performance, and the ability to catalyze the oxygen generation reaction process is still insufficient.

Method used

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  • Cobalt nitride nanometer cubic-nitrogen doped carbon composite material, preparation method and application
  • Cobalt nitride nanometer cubic-nitrogen doped carbon composite material, preparation method and application
  • Cobalt nitride nanometer cubic-nitrogen doped carbon composite material, preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0069] Step (1): Take 2.94g of cobalt nitrate and 0.9g of polyvinylpyrrolidone and add them into 200ml of methanol at the same time, and stir magnetically for 30min to form a dispersion. Dissolve 11.6g of 2-methylimidazole in 200ml of methanol solution, stir the same for 30min and then quickly mix the two dispersions. After magnetic stirring for 1h, a uniformly dispersed precursor solution is obtained. Stand and purify at room temperature for 24h, resulting in a purple precipitate , the product was filtered and washed alternately with methanol and deionized water for 3 times, and dried in a vacuum oven at 60°C for 24 hours to obtain a nanoscale metal-organic framework complex; the particle size of the prepared nanoscale metal-organic framework complex was 70nm , the specific surface area is 900m2 / g, and the pore volume is 0.3cm3 / g.

[0070] Step (2): After transferring the nanoscale metal-organic framework complex prepared in step (1) to a tube furnace, heat it from room tempe...

Embodiment 2

[0075] Step (1): Take 2.32g of cobalt nitrate and 0.7g of polyvinylpyrrolidone and add them into 200ml of methanol at the same time, and stir magnetically for 30min to form a dispersion. Dissolve 3.3g of 2-methylimidazole in 200ml of methanol solution, stir the same for 30min and then quickly mix the two dispersions. After magnetic stirring for 1h, a uniformly dispersed precursor solution is obtained. Stand and purify at room temperature for 18h, resulting in a purple precipitate , the product was filtered and washed alternately with methanol and deionized water for 3 times, and dried in a vacuum oven at 60°C for 24 hours to obtain a nanoscale metal-organic framework complex; the particle size of the prepared nanoscale metal-organic framework complex was 60nm, the specific surface area is 850m 2 / g, the pore volume is 0.3cm 3 / g.

[0076] Step (2): After transferring the nanoscale metal-organic framework complex prepared in step (1) to a tube furnace, heat it from room tempe...

Embodiment 3

[0081]Step (1): Take 2.94g of cobalt nitrate and 0.3g of polyvinylpyrrolidone and add them into 200ml of methanol at the same time, and stir magnetically for 30min to form a dispersion. Dissolve 8.2g of 2-methylimidazole in 200ml of methanol solution, stir for 30min and quickly mix the two dispersions. After magnetically stirring for 1h, a uniformly dispersed precursor solution is obtained. Stand and purify at room temperature for 24h, resulting in a purple precipitate , the product was filtered and washed alternately with methanol and deionized water for 3 times, and dried in a vacuum oven at 60°C for 12 hours to obtain the nanoscale metal-organic framework complex; the particle size of the obtained nanoscale metal-organic framework complex was 80nm, the specific surface area is 950m 2 / g, the pore volume is 0.35cm 3 / g.

[0082] Step (2): After transferring the nanoscale metal-organic framework complex prepared in step (1) to a tube furnace, heat it from room temperature t...

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Abstract

The invention discloses a preparation method for a bifunctional catalyst material for a lithium air battery. A cobalt nitride nanometer cubic-nitrogen doped carbon composite material is taken as an air electrode catalyst material. The preparation method comprises the following steps: dispersing cobalt salt and polyvinylpyrrolidone in methyl alcohol, thereby acquiring a dispersion solution; dissolving 2-methylimidazole in methyl alcohol, thereby acquiring another dispersion solution; mixing the two dispersion solutions, fully stirring for reacting, and then standing, purifying and washing, thereby acquiring a nanometer-scale metallic organic frame complex; performing fractional heat treatment on the complex at 300-400 DEG C, wherein the front fractional heat treatment is performed under inert atmosphere and the posterior fractional heat treatment is performed under the condition of introducing ammonia gas; and finally, acquiring the cobalt nitride nanometer cubic-nitrogen doped carbon composite material. When the material is applied to the catalyst for the lithium air battery, under the effects of high electronic transmission performance and stable catalytic performance of nitrides, the charging / discharging over-potential of the lithium air battery can be effectively reduced, the double-trip efficiency of the battery can be increased, and the circulating service life of the battery can be prolonged. The invention has the advantages of excellent catalytic performance of the catalyst material, simple and controllable preparation method, high operability and low production cost.

Description

technical field [0001] The invention belongs to the field of electrocatalysts for chemical power sources, and in particular relates to a cobalt nitride nanocube-nitrogen-doped carbon composite material for positive electrodes of lithium-air batteries, and a preparation method and application thereof. Background technique [0002] With the rapid development of the global economy, human needs for energy are becoming more and more urgent. The advancement of urbanization has caused a surge in the number of cars, resulting in a sharp drop in air quality. Therefore, lithium-ion batteries have broad prospects for application in the automotive field. However, the energy density of traditional lithium-ion batteries is not high, while lithium-air batteries have about ten times the energy density of traditional lithium batteries, and their theoretical specific energy is as high as 11680Wh / kg, which is close to the energy density of traditional fossil fuels (about 13000Wh / kg); At the ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M12/08
CPCH01M4/8647H01M4/88H01M4/9083H01M12/08H01M2004/8689Y02E60/10
Inventor 张治安赖延清焦一峰宋俊肖张志福贺亮郭利生许靖远
Owner CENT SOUTH UNIV
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