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Porous carbon material for alkali lignin-based supercapacitor as well as preparation method and application thereof

A supercapacitor and alkali lignin technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, carbon preparation/purification, etc., can solve the problems of complex process and cost increase, achieve wide sources and reduce production costs , The effect of electrochemical cycle stability

Active Publication Date: 2017-05-31
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the process is complicated and the cost is greatly increased

Method used

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  • Porous carbon material for alkali lignin-based supercapacitor as well as preparation method and application thereof
  • Porous carbon material for alkali lignin-based supercapacitor as well as preparation method and application thereof
  • Porous carbon material for alkali lignin-based supercapacitor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After dissolving the alkali lignin in the papermaking black liquor in water, adjust the pH to 9 with mineral acid, and take the filtrate after filtration; then continue to adjust the pH to 3 with inorganic acid, filter, wash 3 times, and obtain rough purified alkali lignin after drying white.

[0025] Weigh 35 g of the crudely purified alkali lignin and dissolve it in 870 mL of water, adjust the pH to neutral with dilute sulfuric acid, and perform suction filtration. Take the filtrate, continue to adjust the pH of the solution to 2.5 with dilute sulfuric acid, and reflux in an oil bath at 80°C for 8 hours. Filter, wash with water 3 times until neutral and dry for use. Weigh 10g alkali lignin, 10g polyether F127 and 32g Mg(CH 3 COO) 2 4H 2 O, dissolved in 550mL of tetrahydrofuran and water mixed solution with a volume ratio of 1:1, added 2mL of formaldehyde and 1.5mL of hydrochloric acid, and fully stirred evenly. The above mixed liquid was dried at 75° C. to obtain...

Embodiment 2

[0028] Take 500mL of papermaking black liquor and dilute it into 1000mL of water, adjust the pH to neutral with dilute hydrochloric acid, and perform suction filtration. Take the filtrate, continue to adjust the pH of the solution to 2, and reflux in an oil bath at 90°C for 8 hours. Filter, wash with water twice until neutral and dry to obtain alkali lignin for use. Get 10g alkali lignin, 15g polyether F127 and 42.6g Mg(CH 3 COO) 2 4H 2O, dissolved in 600mL of tetrahydrofuran and water mixed solution with a volume ratio of 1:1, added 2mL of formaldehyde and 1.3mL of hydrochloric acid, and fully stirred evenly. The above mixed liquid was dried at 70° C. to obtain a dark brown lumpy solid. Then under the protection of nitrogen, heat from room temperature to 70°C at a rate of 10°C / min, heat to 400°C at a rate of 2°C / min, and then heat from 400°C to 1000°C at a rate of 2°C / min for carbonization, and keep at 1000°C 30min, and then continue to feed nitrogen to cool to room temp...

Embodiment 3

[0031] After dissolving the alkali lignin in the papermaking black liquor in water, adjust the pH to 9 with mineral acid, and take the filtrate after filtration; then continue to adjust the pH to 3 with inorganic acid, filter, wash 3 times, and obtain rough purified alkali lignin after drying white.

[0032] Weigh 30 g of the crudely purified alkali lignin and dissolve it in 800 mL of water, adjust the pH to neutral with dilute sulfuric acid, and perform suction filtration. Take the filtrate, continue to adjust the pH of the solution to 2, and reflux in an oil bath at 80°C for 9 hours. Filter, wash with water 3 times until neutral and dry for use. Weigh 10g alkali lignin, 32g polyether F127 and 21.3g Mg(CH 3 COO) 2 4H 2 O, dissolved in 400mL of a mixed solution of tetrahydrofuran and water with a volume ratio of 4:6, added 2mL of formaldehyde and 1.34mL of hydrochloric acid, and fully stirred evenly. The above mixed liquid was dried at 70° C. to obtain a dark brown lumpy ...

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Abstract

The invention discloses a porous carbon material for an alkali lignin-based supercapacitor as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing alkali lignin coarsely purified from papermaking black liquid with a three-block polymer Pluronic Fl 27 and Mg(CH3COO)2.4H2O, and adding formaldehyde and hydrochloric acid for full and uniform stirring to obtain a mixed solution; placing the mixed solution into a drying oven for drying, so as to obtain a black brown solid; then putting the black brown solid into a tubular furnace for carbonization reaction, continuously feeding nitrogen or inert gas at the end of the reaction, and cooling to a room temperature; finally carrying out acid pickling, washing and drying to obtain the black powdered porous carbon material. The obtained material can be applied to a double-electrode-layer supercapacitor; in the carbonization process, no strong-causticity chemical substances such as strong acid and strong alkali are used, so that the loss of equipment is reduced to the maximum extent; the used raw materials are by-products in the pulp and paper making industry, so that the maximum use of resources is realized; moreover, lignin is wide in source and low in cost, so that the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method and application of a porous carbon material, in particular to a method for preparing a porous carbon material by using a renewable biomass resource lignin as a raw material through a double-template method, and the application of the material in supercapacitors. Background technique [0002] Lignin is the second most abundant renewable resource in nature, second only to cellulose, and is also the most abundant aromatic polymer in nature. However, at present, lignin, as a by-product of the pulp and paper industry, has not been effectively utilized and has caused certain environmental pollution. Lignin molecules contain a large amount of phenylpropane structure, and the carbon content exceeds 60%. It is not only rich in content, wide in source, but also low in cost, so it is one of the most promising ideal precursors for the preparation of carbon materials. With the increasing depletion of energy and resou...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01G11/44H01G11/34H01G11/86
CPCY02E60/13H01G11/44C01P2006/12C01P2006/14C01P2006/17C01P2006/40H01G11/34H01G11/86
Inventor 刘军利宋曜光孙康许伟
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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