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A nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, preparation method and application

A composite graphene and nitrogen-doped carbon technology, applied in electrolytic components, electrodes, electrolytic process, etc., can solve the problems of long preparation cycle, high cost of large-scale production, expensive raw materials, etc., and achieve short preparation cycle and low price , the effect of simple equipment

Active Publication Date: 2022-04-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are many methods for preparing nitrogen-doped carbon composite graphene-coated metal cobalt catalysts, the most widely used method is chemical vapor deposition, which uses cobalt chloride and metal-organic frameworks (MOFs) as raw materials, and is calcined at high temperature to obtain carbon metal-based catalyst, but the existing preparation method has a long cycle, the raw materials used are relatively expensive, and the cost of large-scale production is high

Method used

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  • A nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, preparation method and application
  • A nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, preparation method and application
  • A nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, preparation method and application

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Embodiment 1

[0028] Dissolve 2.673g of citric acid in 15mL of deionized water and 15mL of ethanol, stir in a 50mL polytetrafluoroethylene-lined stainless steel autoclave for 10min, then add 0.9g of urea, stir at room temperature for 10min, then add 0.05g of graphene oxide, After ultrasonication for 30min, it was formed into a suspension, which was reacted in an oven at 180°C for 12h; the obtained powdery nitrogen-doped carbon composite graphene precursor was alternately centrifuged at 10,000rpm with deionized water and ethanol for 3 times and then centrifuged at 60 Dry in a vacuum oven for 24 hours at ℃;

[0029] Then, fully dissolve 0.441g cobalt nitrate hexahydrate and 0.03g powdered nitrogen-doped carbon composite graphene precursor in 15mL ethanol, add 1mL triethanolamine and then stir for 10min, heat and stir at 60°C for 30min, and then After drying in an oven at 60°C for 12 hours, put the obtained powdery nitrogen-doped carbon composite graphene-coated metal cobalt precursor together...

Embodiment 2

[0031] Dissolve 2.673g of citric acid in 15mL of deionized water and 15mL of ethanol, stir in a 50mL polytetrafluoroethylene-lined stainless steel autoclave for 10min, then add 0.9g of urea, stir at room temperature for 10min, then add 0.05g of graphene oxide, After ultrasonication for 30min, it was formed into a suspension, which was reacted in an oven at 180°C for 12h; the obtained powdery nitrogen-doped carbon composite graphene precursor was alternately centrifuged at 10,000rpm with deionized water and ethanol for 3 times and then centrifuged at 60 Dry in a vacuum oven for 24 hours at ℃;

[0032] Then, fully dissolve 0.441g cobalt nitrate hexahydrate and 0.03g powdered nitrogen-doped carbon composite graphene precursor in 15mL ethanol, add 1mL triethanolamine and then stir for 10min, heat and stir at 60°C for 30min, and then After drying in an oven at 60°C for 12 hours, put the obtained powdery nitrogen-doped carbon composite graphene-coated metal cobalt precursor together...

Embodiment 3

[0034] Dissolve 2.673g of citric acid in 15mL of deionized water and 15mL of ethanol, stir in a 50mL polytetrafluoroethylene-lined stainless steel autoclave for 10min, then add 0.9g of urea, stir at room temperature for 10min, then add 0.05g of graphene oxide, After ultrasonication for 30min, it was formed into a suspension, which was reacted in an oven at 180°C for 12h; the obtained powdery nitrogen-doped carbon composite graphene precursor was alternately centrifuged at 10,000rpm with deionized water and ethanol for 3 times and then centrifuged at 60 Dry in a vacuum oven for 24 hours at ℃;

[0035] Then, fully dissolve 0.441g cobalt nitrate hexahydrate and 0.03g powdered nitrogen-doped carbon composite graphene precursor in 15mL ethanol, add 1mL triethanolamine and then stir for 10min, heat and stir at 60°C for 30min, and then After drying in an oven at 60°C for 12 hours, put the obtained powdery nitrogen-doped carbon composite graphene-coated metal cobalt precursor together...

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Abstract

The invention discloses a preparation method of a nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, and relates to the technical field of catalysts. The method includes the following steps: using carbon source, nitrogen source, and graphene oxide as reaction raw materials, in a liquid medium, hydrothermally reacting at 180-220° C. for 10-15 hours to obtain a nitrogen-doped carbon composite graphene precursor; cobalt salt and The obtained nitrogen-doped carbon composite graphene precursor is uniformly dispersed in an organic solvent, under the action of a complexing agent, stirred and reacted at 50-75°C for 0.5-1h, after the reaction is completed, it is washed and dried to obtain a nitrogen-doped Heterocarbon composite graphene-coated metal cobalt precursor; the obtained nitrogen-doped carbon composite graphene-coated metal precursor is reacted at 300-600°C for 1-6 hours in a mixed atmosphere of hydrogen and argon to obtain the obtained The nitrogen-doped carbon composite graphene-coated metal cobalt catalyst. The raw materials used in the method provided by the invention are cheap, the preparation process is simple, safe, and the cycle is short, the required equipment is simple, and it is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a nitrogen-doped carbon composite graphene-coated metal cobalt catalyst, a preparation method and an application. Background technique [0002] With the massive consumption of fossil fuels, severe environmental problems and energy problems are brought about, so the development of clean, environmentally friendly and renewable energy is imminent. Hydrogen energy has the advantages of high energy density, clean products, and high combustion calorific value, and is considered to be an ideal substitute for traditional fossil fuels. Among the many preparation methods, electrolysis of water for hydrogen production is simple and the product is clean. It is a way to obtain efficient hydrogen, but its reaction kinetics is slow and requires a high potential, and the preparation process consumes additional energy, so it is highly active. The addition of catalyst is the key. At present, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B1/04Y02E60/36
Inventor 余愿楚文慧孙东峰许并社屈彦宁孟方友林宋敏黄洛
Owner SHAANXI UNIV OF SCI & TECH