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Nitrogen-doped three-dimensional bicontinuous porous structure ultra-thin carbon layer and its preparation method and application

A porous structure, ultra-thin carbon technology, applied in the preparation/purification of carbon, etc., can solve the problems of complex process and high cost, and achieve the effect of simple process, low cost and wide source.

Active Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a new nitrogen-doped three-dimensional double-continuous porous structure ultra-thin carbon layer and its preparation method and application, which can overcome the disadvantages of complex process and high cost in the preparation process of template method, and combine biomass template and physical method With the advantages of the chemical method, it is easier to do the nitrogen atom doping, and finally a new type of nitrogen-doped three-dimensional double continuous porous structure ultra-thin carbon layer with special morphology and excellent electrochemical performance is prepared.

Method used

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  • Nitrogen-doped three-dimensional bicontinuous porous structure ultra-thin carbon layer and its preparation method and application
  • Nitrogen-doped three-dimensional bicontinuous porous structure ultra-thin carbon layer and its preparation method and application
  • Nitrogen-doped three-dimensional bicontinuous porous structure ultra-thin carbon layer and its preparation method and application

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Embodiment 1

[0044] Fresh shrimp shells were ultrasonically cleaned with deionized water for 3 times, then ultrasonically immersed in 10% NaOH solution for 1 h, poured off the solution, and dried in an air drying oven at 80°C for 12 h. Take 8g of dried shrimp shells and 40g of urea (mass ratio of shrimp shells and urea is 1:5) into a beaker, add 100ml of deionized water, stir magnetically to completely dissolve the urea, and heat at 50°C until the water evaporates completely. Then grind it into powder in a mortar and put it into a crucible, under the protection of nitrogen (flow rate 100mL / min), raise the temperature to 400°C at a rate of 10°C / min in a tube furnace, and keep it for 1h for pre-carbonization get the precursor. Grind and mix the low-temperature pyrolyzed substance and potassium hydroxide at a mass ratio of 1:1, put them in a crucible, place them in a tube furnace, and heat them at 10°C / min under the protection of nitrogen (flow rate: 100mL / min). The temperature was raised to...

Embodiment 2

[0050] Fresh shrimp shells were ultrasonically cleaned with deionized water for 3 times, then ultrasonically immersed in a 10% NaOH solution for 1 h, poured off the liquid, and dried in an air drying oven at 80°C for 12 h. Take 15g of dried shrimp shells, 0.15g of melamine (mass ratio of shrimp shells to melamine: 1:0.01), add 80ml of deionized water, stir magnetically to completely dissolve the melamine, and heat at 50°C until the water evaporates completely. Then grind it into a powder in a mortar, put it into a crucible, crush it, put it into a crucible, and heat it up to 450°C at a rate of 10°C / min in a tube furnace under the protection of argon (flow rate: 100mL / min). And keep it for 1h, and perform pre-carbonization to obtain a precursor. Grind and mix the low-temperature pyrolyzed substance and sodium hydroxide at a mass ratio of 1:1, put them in a crucible, place them in a tube furnace, and heat them at 10°C / min under the protection of argon (flow rate: 100mL / min). Th...

Embodiment 3

[0052] Fresh shrimp shells were ultrasonically cleaned with deionized water for 3 times, then ultrasonically immersed in 10% KOH solution for 2 h, poured off the solution, and dried in an air drying oven at 80°C for 12 h. Take dried shrimp shells and pyrrole at a mass ratio of 1:5, put them in a beaker, add 100ml of deionized water, stir magnetically to completely dissolve the pyrrole, and heat at 50°C until the water evaporates completely. Then grind it into powder in a mortar and put it into a crucible, under the protection of nitrogen (flow rate 200mL / min), raise the temperature to 500°C at a rate of 10°C / min in a tube furnace, and keep it for 1h for pre-carbonization get the precursor. Grind and mix the low-temperature pyrolyzed substance and potassium carbonate at a mass ratio of 1:3, put them in a crucible, and place them in a tube furnace at a rate of 10°C / min under the protection of nitrogen (flow rate: 200mL / min). Raise the temperature to 850°C and keep it for 1h, th...

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Abstract

The invention discloses a nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer and a preparation method and application thereof. The preparation method comprises the steps that shrimp shell pretreatment is conducted, by taking urea or melamine or pyrrole as a nitrogen source and taking shrimp shells subjected to treatment as a raw material, under inert gas flow, low-temperature pre-carbonization is conducted, then, high-temperature pyrolysis is conducted with alkaline matter, acid treatment is conducted at last, and the nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer is obtained. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer prepared through the method has a unique nano ultrathin carbon layer structure, a high specific surface area and a total pore volume, is simple in technology, low in cost, friendly to environment, and has good physical and chemical properties. The nitrogen-doped three-dimensional bicontinuous porous structure ultrathin carbon layer can be applied to a supercapacitor, a secondary battery and gas absorption, and a new way for developing new energy biomass materials is opened up.

Description

technical field [0001] The invention belongs to the field of preparation and application of biomass carbon materials, and more specifically relates to a nitrogen-doped three-dimensional bicontinuous porous structure ultra-thin carbon layer and its preparation method and application. Background technique [0002] With the increasing shortage of non-renewable energy and more and more serious environmental pollution, people will become more and more dependent on renewable energy and green new energy. Biomass energy is the fourth largest energy after coal, oil and natural gas. It has the characteristics of high energy storage, renewable and non-polluting. It has always been favored by people in the use of biomass to prepare carbon materials. The carbon materials prepared from biomass have high specific surface area, high stability, good conductivity, and can be commercially produced on a large scale. The advantages. [0003] With the rapid development of aquaculture and touris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01P2002/30C01P2002/85C01P2004/04C01P2006/12C01P2006/14C01P2006/16C01P2006/17C01P2006/40
Inventor 常海欣张娜刘志轩
Owner HUAZHONG UNIV OF SCI & TECH
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