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Method for preparing hetero-atom doped porous carbon material through carbonation of biomass under assistance of molten salt

A technology of porous carbon materials and molten salts, which is applied in the field of preparation of porous carbon materials, can solve the problems of cumbersome steps in the template method, corrosion of production equipment, environmental pollution, etc., and achieve the effects of low cost, easy operation, and high purity of reactants

Inactive Publication Date: 2016-02-10
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current problem is that the direct carbonization-post-activation method usually needs to be completed at a higher temperature, so the production energy consumption is an important issue restricting its development, and the chemical reagents used in the chemical activation will cause serious corrosion to the production equipment. At the same time, if the waste water and waste gas generated in the production process are not properly treated, they will cause great environmental pollution
The steps of the template method are cumbersome, and the steps such as the combination of the matrix and the template agent and the removal of the template agent take a long time

Method used

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  • Method for preparing hetero-atom doped porous carbon material through carbonation of biomass under assistance of molten salt
  • Method for preparing hetero-atom doped porous carbon material through carbonation of biomass under assistance of molten salt
  • Method for preparing hetero-atom doped porous carbon material through carbonation of biomass under assistance of molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of N-doped porous carbon materials

[0026] Weigh 1g of tofu powder (obtained by freeze-drying and grinding of tofu purchased in the market), and 5g of molten salt of LiCl / KCl (the mass ratio of LiCl and KCl is 59 / 41) and 0.1g of KNO 3 After mixing evenly, put it into a tube furnace, under Ar atmosphere, at 5°C min -1 The heating rate was increased to 750°C, and the temperature was kept constant for 60 minutes. After cooling, it was washed with distilled water to remove the molten salt, and it was centrifuged and dried for later use.

[0027] The physical and chemical properties of the prepared porous carbon material were characterized by scanning electron microscopy, nitrogen adsorption and desorption analysis, and elemental analyzer. The results are shown in figure 1 , Figure 2 and image 3 , the supercapacitor test was carried out on the prepared porous carbon material, the results are shown in Figure 4 .

[0028] figure 1 It shows that the prepared...

Embodiment 2

[0030] Preparation of S-doped porous carbon materials

[0031] Weigh 1g of biomass powder (obtained by grinding sawdust after drying at high temperature), mix it with 5g of LiCl / KCl salt (the mass ratio of LiCl and KCl is 59 / 41) and 0.1g of NaS, and put it into the tube In the furnace, under Ar atmosphere, at 5°C min -1 The heating rate was increased to 750°C, and the temperature was kept constant for 60 minutes. After cooling, it was washed with distilled water to remove the molten salt, and it was centrifuged and dried for later use.

[0032] The specific surface area of ​​the S-doped carbon material prepared by nitrogen adsorption and desorption analysis is 1310m 2 g -1 , Elemental analysis results are carbon 90.4%, oxygen 6.5%, sulfur 3.1%. Supercapacitor performance test shows that 1A g -1 Under the discharge current density, the specific capacity is 285F·g -1 , 50A·g -1 When the capacitance is still maintained at 120F·g -1 .

Embodiment 3

[0034] Preparation of N and S doped porous carbon materials

[0035] Weigh 1g of biomass powder (obtained by drying, dehydrating and grinding green seaweed), mix it with 5g of LiCl / KCl salt (the mass ratio of LiCl and KCl is 59 / 41) and 0.1g of thiourea, and put it into the tube In a type furnace, under Ar atmosphere, at 5°C·min -1The heating rate was increased to 750°C, and the temperature was kept constant for 60 minutes. After cooling, it was washed with distilled water to remove the molten salt, and it was centrifuged and dried for later use.

[0036] The specific surface area of ​​the N and S co-doped carbon material prepared by nitrogen adsorption and desorption analysis is 1800m 2 g -1 , The elemental analysis results are 88.6% carbon, 5.5% oxygen, 3.5% nitrogen, and 2.4% sulfur. Supercapacitor performance test shows that 1A g -1 Under the discharge current density, the specific capacity is 350F·g -1 , 50A·g -1 When the capacitance is still maintained at 180F·g -1...

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Abstract

The invention provides a method for preparing a hetero-atom doped porous carbon material through carbonation of biomass under the assistance of molten salt. The method comprises the following steps: uniformly mixing biomass powder, the molten salt and a hetero-atom doped compound to obtain a product A, wherein the molten salt contains LiCl and KCl, the mass of LiCl accounts for 59 percent of that of the molten salt, and the mass of KCl accounts for 59 percent of that of the molten salt; putting the product A in a pipe furnace; carrying out high-temperature calcination; cleaning with distilled water to remove the molten salt and obtain the final product, namely the hetero-atom doped porous carbon material. The method has the advantages that the biomass is taken as a raw material, and the molten salt containing hetero-atoms is taken as a carbonization medium, so that the hetero-atoms can be introduced into the skeleton of the carbon material during the pyrolysis and carbonization process of the biomass synchronously and controllably, and the hetero-atom in-situ doped porous carbon material is obtained finally. Compared with the conventional doping method, the method provided by the invention have the advantages that the steps are simple; the cost is low; the operation is easy; the reactant purity is high; the application prospect is relatively good.

Description

technical field [0001] The invention relates to a method for preparing porous carbon materials, in particular to a method for preparing heteroatom-doped porous carbon materials by assisting carbonization of biomass with molten salt. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional capacitors and rechargeable batteries. Due to its advantages such as large specific power, wide operating temperature range, long service life, good reliability and maintenance-free, it has attracted widespread attention. attention. However, compared with lithium-ion batteries, its energy density is relatively low, which cannot meet the current requirements for high energy density of chemical power sources, so it needs to be further improved. Supercapacitors include two different storage charge mechanisms: one is electric double layer capacitance, the mechanism is the rapid accumulation process of positive and negative charges on the interface...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 程魁曹殿学欧阳田江杰涛叶克王贵领
Owner HARBIN ENG UNIV
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