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S-doped high specific surface area microporous-mesoporous-macroporous carbon and preparation method and use thereof

A high specific surface area, porous carbon technology, applied in the field of materials, can solve the problems of complex preparation process and increased production cost, and achieve the effect of simplifying S doping technology

Inactive Publication Date: 2017-03-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most S atom-doped porous carbons use two or more raw materials as the C source and S source. Not only the raw material requirements are strict, but also the raw materials need to go through a complicated mixing preparation process, which leads to an increase in production costs and a more complicated preparation process.

Method used

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  • S-doped high specific surface area microporous-mesoporous-macroporous carbon and preparation method and use thereof
  • S-doped high specific surface area microporous-mesoporous-macroporous carbon and preparation method and use thereof
  • S-doped high specific surface area microporous-mesoporous-macroporous carbon and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 The S-doped high specific surface area microporous-mesoporous-macroporous porous carbon of this example and its preparation method include:

[0039] Step 1. Mix 2g of lignosulfonate and 3ml of sulfuric acid (1mol / L) evenly to obtain a sulfuric acid solution containing lignosulfonate. Dissolve the lignosulfonate at a certain stirring speed for 3 hours at room temperature. After the acid salt is completely dissolved, add a certain amount of 3ml TEOS and continue stirring for 3 hours until TEOS is completely dissolved in the sulfuric acid solution;

[0040] Step 2. Put the sulfuric acid aqueous solution containing lignosulfonate and TEOS into an oven at 40°C for sol-gel reaction for 48 hours, then age at 100°C for 6 hours, and then raise the temperature to 160°C for 6 hours;

[0041] Step 3. Put the black gel-like product obtained in step 2 into a tube furnace at a rate of 5°C / min to raise the temperature from the initial temperature of 50°C to 600°C, keep it at ...

Embodiment 2

[0044] Example 2 The S-doped high specific surface area microporous-mesoporous-macroporous porous carbon of this example and its preparation method include:

[0045] Step 1. Mix 2g of lignosulfonate and 3ml of sulfuric acid (1mol / L) evenly to obtain a sulfuric acid solution containing lignosulfonate. Dissolve the lignosulfonate at a certain stirring speed for 3 hours at room temperature. After the acid salt is completely dissolved, add a certain amount of 3ml TEOS and continue stirring for 3 hours until TEOS is completely dissolved in the sulfuric acid solution;

[0046]Step 2. Put the sulfuric acid aqueous solution containing lignosulfonate and TEOS into an oven at 40°C for sol-gel reaction for 48 hours, then age at 100°C for 6 hours, and then raise the temperature to 160°C for 6 hours;

[0047] Step 3. Put the black gel-like product obtained in step 2 into a tube furnace at a rate of 5°C / min to raise the temperature from the initial temperature of 50°C to 700°C, keep it at 7...

Embodiment 3

[0050] Example 3 The S-doped high specific surface area microporous-mesoporous-macroporous porous carbon of this example and its preparation method include:

[0051] Step 1. Mix 2g of lignosulfonate and 3ml of sulfuric acid (1mol / L) evenly to obtain a sulfuric acid solution containing lignosulfonate. Dissolve the lignosulfonate at a certain stirring speed for 3 hours at room temperature. After the acid salt is completely dissolved, add a certain amount of 3ml TEOS and continue stirring for 3 hours until TEOS is completely dissolved in the sulfuric acid solution;

[0052] Step 2. Put the sulfuric acid aqueous solution containing lignosulfonate and TEOS into an oven at 40°C for sol-gel reaction for 48 hours, then age at 100°C for 6 hours, and then raise the temperature to 160°C for 6 hours;

[0053] Step 3. Put the black gel-like product obtained in step 2 into a tube furnace at a rate of 5°C / min to raise the temperature from the initial temperature of 50°C to 600°C, keep it at ...

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Abstract

The invention discloses S-doped high specific surface area microporous-mesoporous-macroporous carbon and a preparation method thereof. The preparation method utilizes lignin sulfonate as a C and S dual-source, sulfuric acid as a hydrolysis agent and ethyl orthosilicate (TEOS) as a mesoporous template agent. The preparation method comprises dissolving lignin sulfonate in sulfuric acid, after complete dissolution, adding TEOS into the solution, and carrying out crosslinking, carbonization and etching to obtain a S-doped microporous-mesoporous-macroporous carbon supercapacitor material with a high specific surface area. The preparation method utilizes waste lignin sulfonate as a raw material obtained by the sulfite method-based pulping paper making process so that a price is low and the C and S dual-source is provided and thus a complex step of C and S source mixing in the existing S-doping-based porous carbon preparation method is avoided. The S-doped high specific surface area microporous-mesoporous-macroporous carbon has a specific surface area of 952-1534 m<2> / g and a pore volume of 0.8855-1.7391 cm<3> / g. The lignin porous carbon obtained by the preparation method is used as the supercapacitor electrode material and has the specific capacity of 318 F / g in the aqueous electrolyte and the specific capacity is 27% higher than that of the traditional C source sucrose.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a high specific surface area microporous-mesoporous-macroporous porous carbon which can be used for preparing supercapacitor materials and a preparation method thereof. Background technique [0002] With the increasingly severe global problems, such as pollution and excessive consumption of petroleum resources, sustainable biorefining, as a new technology that can replace chemical refining technology, has attracted more and more attention. As a by-product of the paper industry, lignin is mainly used for combustion to provide heat, and the utilization rate is low. Therefore many studies are aimed at converting lignin by-products into high value-added products. [0003] Lignosulfonate is a by-product of acid sulfite pulping of wood. During this pulping process, sulfate (SO 3 2- ) or bisulfite (HSO 3 - ) is the main pulping agent, and the cations can be sodium, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01G11/24H01G11/44
CPCY02E60/13H01G11/24C01P2004/03C01P2006/12C01P2006/14C01P2006/40H01G11/44
Inventor 田景阳张海燕
Owner GUANGDONG UNIV OF TECH
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