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Preparation method of nano cobalt hexacyanocobaltate/nitrogen-doped porous carbon composite material

A technology of nitrogen-doped porous carbon and composite materials, which is applied in the field of synthesis of electrode materials for energy storage devices, can solve the problems of poor material binding ability, poor wettability of carbon materials, cumbersome process, etc., and achieve improved reaction rate, excellent performance, and resources. rich effect

Pending Publication Date: 2021-10-26
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing nano-cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material, so as to solve the problems of poor material binding ability, poor wettability of carbon materials and complicated process proposed in the above background technology

Method used

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  • Preparation method of nano cobalt hexacyanocobaltate/nitrogen-doped porous carbon composite material
  • Preparation method of nano cobalt hexacyanocobaltate/nitrogen-doped porous carbon composite material
  • Preparation method of nano cobalt hexacyanocobaltate/nitrogen-doped porous carbon composite material

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Embodiment 1

[0034] A kind of synthetic method of nano cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material, the steps are as follows:

[0035] R(1): Put 60mL of 1.0mol / L NaOH solution into a 100mL beaker, add 3g of casein while heating with magnetic stirring, keep the temperature at 45°C, and stir until it is completely dissolved;

[0036] R(2): Under the condition of magnetic stirring and keeping the temperature at 45°C, use a dropper to draw 10mL of the prepared 70mmol / L Co(NO3)2 solution and add it dropwise to the solution obtained in step R(1), and continue to stir until The solution is uniform;

[0037] R(3): Add 0.3g THEIC to the mixed solution in R(2), and dissolve to a uniform state (no precipitate) under magnetic stirring;

[0038] R(4): Then put the mixed solution in a homogeneous state into a vacuum freeze dryer, and freeze-dry at -82°C for 30 hours;

[0039] R(5): Put the mixture powder obtained after freeze-drying into a vacuum tube furnace, heat to 650°C...

Embodiment 2

[0042] A kind of synthetic method of nano cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material, the steps are as follows:

[0043] S(1): Put 60mL of 0.8mol / L KOH solution into a 100mL beaker, add 3g of soybean protein while heating with magnetic stirring, keep the temperature at 40°C, and stir until it is completely dissolved;

[0044] S(2): Under the condition of magnetic stirring and keeping the temperature at 40°C, pipette 15mL of the prepared 50mmol / L CoCl2 solution into the solution obtained in step S(1) dropwise, and keep stirring until the solution is uniform;

[0045] S(3): Add 0.4g THEIC to the mixed solution in S(2), and dissolve to a uniform state (no precipitate) under magnetic stirring;

[0046] S(4): Then put the mixed solution in a homogeneous state into a vacuum freeze dryer, and freeze-dry at -55°C for 48 hours;

[0047] S(5): Put the mixture powder obtained after freeze-drying into a vacuum tube furnace, heat to 600°C and keep it warm fo...

Embodiment 3

[0050] A kind of synthetic method of nano cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material, the steps are as follows:

[0051] T(1): Take 50mL of 1.0mol / L NaOH solution into a 100mL beaker, add 4g of soybean protein while heating with magnetic stirring, keep the temperature at 50°C, and stir until it is completely dissolved;

[0052] T(2): Under the condition of magnetic stirring and the temperature is kept at 50°C, use a dropper to absorb 15mL of the prepared 50mmol / L CoC2O2 solution and add it dropwise to the solution obtained in step T(1), and continue to stir until the solution is uniform;

[0053] T(3): Add 0.6g THEIC to the mixed solution in T(2), and dissolve it to a uniform state (no precipitate) under magnetic stirring;

[0054] T(4): Then put the mixed solution in a homogeneous state into a vacuum freeze dryer, and freeze-dry at -80°C for 48 hours;

[0055] T(5): Put the mixture powder obtained after freeze-drying into a vacuum tube furnace,...

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Abstract

The invention discloses a preparation method of a nano cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material. By taking biological protein rich in natural resources as a raw material, taking a strong alkali solution as a medium, taking tris(2-hydroxyethyl)isocyanurate (THEIC) as a cyano providing source and taking cobalt salt as a raw material, the nano Co3[Co(CN)6]2 / nitrogen-doped porous carbon composite material is prepared through one-step high-temperature pyrolysis of a precursor mixture. Compared with a traditional solution chemical compounding method, the method has the advantages that the binding force between two components in the composite material is enhanced, and meanwhile, the charge transfer capacity between the two components is improved; in addition, biological protein is protein rich in nitrogen element, and a self-doped nitrogen-doped porous carbon material is formed after carbonization, so the wettability of the material in an aqueous electrolyte is improved, Co3[Co(CN)6]2 particles are uniformly embedded in nitrogen-doped porous carbon with a high specific surface area in a nanocrystallization manner, and the conductivity and the reaction rate of the material are greatly improved in the charging and discharging process.

Description

technical field [0001] The invention belongs to the technical field related to the synthesis of electrode materials for energy storage devices, and in particular relates to a method for preparing a nanometer cobalt hexacyanocobaltate / nitrogen-doped porous carbon composite material. Background technique [0002] Supercapacitors have become the most promising energy storage devices in the field of energy storage because of their high power density, energy density and excellent cycle life. The electrode material of electric double layer supercapacitor is carbon material with high specific surface area, and it has been widely used. However, the limited specific surface area of ​​carbon material leads to low energy density of electric double layer capacitor; The reversible redox reaction between them is used to store and release energy, and it is used as a supercapacitor electrode material to exhibit high energy density. Typical pseudocapacitive materials include transition metal...

Claims

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Application Information

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IPC IPC(8): C01C3/11C01B32/00B82Y40/00B82Y30/00H01G11/30H01G11/24H01G11/44
CPCC01C3/11C01B32/00B82Y40/00B82Y30/00H01G11/30H01G11/24H01G11/44C01P2004/80C01P2006/40
Inventor 贾少培穆云超黄权张牛
Owner ZHONGYUAN ENGINEERING COLLEGE
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