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Nitrogen-doped carbon quantum dots and preparation method thereof, and reduced graphene oxide and preparation method and application thereof

A technology of carbon quantum dots and nitrogen doping, applied in electrolytic components, electrodes, electrolytic processes, etc., can solve the problems of limiting the large-scale production and application of carbon quantum dots, and the high cost of carbon quantum dot sources

Active Publication Date: 2021-07-09
NORTHWEST UNIV(CN)
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  • Abstract
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Problems solved by technology

[0005] The object of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of nitrogen-doped carbon quantum dot and its preparation method, and reduced graphene oxide and its preparation method and application; To solve the problem in the existing non-precious metal catalyst The high cost of the source of carbon quantum dots limits the technical defects of large-scale production and application of carbon quantum dots

Method used

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  • Nitrogen-doped carbon quantum dots and preparation method thereof, and reduced graphene oxide and preparation method and application thereof
  • Nitrogen-doped carbon quantum dots and preparation method thereof, and reduced graphene oxide and preparation method and application thereof
  • Nitrogen-doped carbon quantum dots and preparation method thereof, and reduced graphene oxide and preparation method and application thereof

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preparation example Construction

[0042] In order to process vinegar residue waste more effectively and utilize it as a resource, the invention provides a method for preparing nitrogen-doped carbon quantum dots using vinegar residue, the method comprising the following steps:

[0043] (1) Dry the vinegar slag in an oven, the drying temperature is 200°C, and the drying time is 2h, take out part of the dried vinegar slag, put it into a muffle furnace for heating and carbonization treatment; the carbonization temperature is 400 ℃, the time is 6 hours, after the carbonization is completed, the carbonized product is taken out, and the carbonized product is ground into powder to obtain carbonized vinegar slag powder.

[0044] (2) In the carbonized vinegar residue powder obtained in step (1), add urea as a nitrogen source, and add water as a solvent simultaneously; when urea is a nitrogen source, the ratio of vinegar residue, urea and water is 0.1g:0.1g:10mL , put the mixture into an autoclave for hydrothermal reacti...

Embodiment 1

[0050] 1) Preparation of nitrogen-doped carbon quantum dots: Put the vinegar residue in an oven at 200°C for 2 hours to dry the moisture contained in the vinegar residue; then put the dried vinegar residue into a porcelain boat and place it on a horse In the Furnace, carbonize at 400°C for 6 hours, take it out after carbonization and grind it into powder; then use an analytical balance to weigh 0.1g of carbonized vinegar residue powder and 0.1g of urea, and measure 10mL of distilled water, mix them into The autoclave was placed in an oven, and reacted at 200° C. for 8 hours; finally, the nitrogen-doped carbon quantum dot solution was obtained by filtering through a 300 mm filter paper.

[0051] 2) Take 10ml of the filtered nitrogen-doped carbon quantum dot solution, 10ml of deionized water and 0.24g of graphene oxide and ultrasonically mix them, and after ultrasonic treatment for 2 hours, a uniformly dispersed mixed solution is formed. After being frozen with liquid nitrogen, ...

Embodiment 2

[0056] 1) Preparation of nitrogen-doped carbon quantum dots: Put the vinegar residue in an oven at 200°C for 2 hours to dry the moisture contained in the vinegar residue; then put the dried vinegar residue into a porcelain boat and place it on a horse In the Furnace, carbonize at 400°C for 6 hours, take it out after carbonization and grind it into powder; then use an analytical balance to weigh 0.1g of carbonized vinegar residue powder and 0.1g of urea, and measure 10mL of distilled water, mix them into The autoclave was placed in an oven, and reacted at 200° C. for 8 hours; finally, the nitrogen-doped carbon quantum dot solution was obtained by filtering through a 100 mm filter paper.

[0057] 2) Take 10ml of the filtered nitrogen-doped carbon quantum dot solution, 10ml of deionized water and 0.24g of graphene oxide and ultrasonically mix them, and after ultrasonic treatment for 1 hour, a uniformly dispersed mixed solution is formed. After being frozen with liquid nitrogen, i...

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Abstract

The invention discloses nitrogen-doped carbon quantum dots and a preparation method thereof, and reduced graphene oxide and a preparation method and application thereof. When nitrogen-doped carbon quantum dots prepared from vinegar residues are directly used as a catalyst in water electrolysis hydrogen evolution, the effect of obviously accelerating the catalytic process in the water electrolysis process is not achieved, therefore, vertical graphene oxide with a stable structure is selected as a substrate material, nitrogen-doped carbon quantum dots are loaded on graphene oxide to form a nitrogen-doped carbon quantum dot loaded reduced graphene oxide material, and the material is used as a catalyst in a water electrolysis process. The material has good catalytic performance and conductive performance, the overpotential in the water electrolysis hydrogen production process can be reduced, the water electrolysis process can be catalyzed and accelerated, and the utilization rate of waste can be increased. Therefore, the material is applied to water electrolysis hydrogen evolution to replace a noble metal catalyst, the preparation cost of the catalyst is reduced, and large-scale production of hydrogen prepared by water electrolysis is realized.

Description

【Technical field】 [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a nitrogen-doped carbon quantum dot and a preparation method thereof, as well as reduced graphene oxide and a preparation method and application thereof. 【Background technique】 [0002] With the decrease of fossil energy, people are facing great challenges, so the development and utilization of green energy has become extremely important. Among them, hydrogen energy is considered to be one of the cleanest and most promising energy sources in the 21st century. At present, the most important way to prepare hydrogen is from fossil fuels. This method uses fossil fuels such as coal, oil or natural gas as raw materials. This method not only caused the consumption of fossil fuels but also caused serious environmental problems. The electrolysis of water to produce hydrogen is to drive water to generate hydrogen, which is a green and environmentally friendly hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/04
CPCC25B11/04C25B1/04Y02E60/36
Inventor 姜彬刘蓉杜烨任笑林李潇斐苏凡罗华雨
Owner NORTHWEST UNIV(CN)
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