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Alginate-based porous carbon as well as preparation method and application thereof

An alginate and porous carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as low efficiency, uneven product structure distribution, incomplete reaction, etc., and achieve rich resources and pore capacitance characteristics. Excellent, easy-to-use results

Active Publication Date: 2020-05-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method directly treats seaweed with metal cations, and seaweed is a raw material with relatively complex components. This treatment method has problems such as incomplete reaction, low efficiency, and uneven distribution of the product structure.

Method used

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  • Alginate-based porous carbon as well as preparation method and application thereof
  • Alginate-based porous carbon as well as preparation method and application thereof
  • Alginate-based porous carbon as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example relates to a method for preparing a calcium-modified soluble alginate-based porous carbon precursor, including the following steps:

[0062] Step 1: Dissolve 50g of sodium alginate in 3000ml of deionized water, and stir thoroughly with an electric mixer to obtain an aqueous solution of sodium alginate.

[0063] In step 2, 36 g of calcium lactate was dissolved in 1000 ml of deionized water, and after manual stirring, an aqueous solution of calcium lactate was obtained.

[0064] Step 3: In a constant temperature water bath at 50°C, under the conditions of electrically stirring the solution obtained in Step 1 at a rate of 2000 r / min, slowly add the solution obtained in Step 2 into the solution in Step 1, keep stirring electrically and heat for 6 hours;

[0065] In step 4, the product obtained in step 3 is fully dried and crushed, and then sieved with an 80-mesh sieve to obtain a calcium-modified soluble alginate-based porous carbon precursor for supercapacitor...

Embodiment 2

[0067] This example relates to a method for preparing a calcium-modified soluble alginate-based porous carbon precursor, including the following steps:

[0068] Step 1: Dissolve 50g of sodium alginate in 3000ml of deionized water, and stir thoroughly with an electric mixer to obtain an aqueous solution of sodium alginate.

[0069] In step 2, 18 g of calcium lactate was dissolved in 1000 ml of deionized water, and after manual stirring, an aqueous solution of calcium lactate was obtained.

[0070] Step 3, under the conditions of electric stirring the solution obtained in step 1 in a constant temperature water bath at 50°C at a rate of 2000 r / min, slowly add the solution obtained in step 2 into the solution in step 1, keep electric stirring and heat for 6 hours;

[0071] In step 4, the product obtained in step 3 is fully dried and crushed, and then sieved with an 80-mesh sieve to obtain a calcium-modified soluble alginate-based porous carbon precursor for supercapacitors.

Embodiment 3

[0073] This example relates to a method for preparing a calcium-modified soluble alginate-based porous carbon precursor, including the following steps:

[0074] Step 1: Dissolve 50g of sodium alginate in 3000ml of deionized water, and stir thoroughly with an electric mixer to obtain an aqueous solution of sodium alginate.

[0075] In step 2, 6 g of calcium lactate was dissolved in 1000 ml of deionized water, and after manual stirring, an aqueous solution of calcium lactate was obtained.

[0076] Step 3, under the conditions of electric stirring the solution obtained in step 1 in a constant temperature water bath at 50°C at a rate of 2000 r / min, slowly add the solution obtained in step 2 into the solution in step 1, keep electric stirring and heat for 6 hours;

[0077] In step 4, the product obtained in step 3 is fully dried and crushed, and then sieved with an 80-mesh sieve to obtain a calcium-modified soluble alginate-based porous carbon precursor for supercapacitors.

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Abstract

The invention relates to alginate-based porous carbon as well as a preparation method and application thereof. The preparation method comprises the following specific steps: putting alginate or a calcium-modified alginate precursor into a tubular furnace, introducing protective gas into the tubular furnace, heating to carry out carbonization; washing and drying the carbonization product, impregnating the carbonization product in a chemical activator solution; after impregnation, heating the carbonization product to activate the carbonization product in a protective atmosphere, and after activation, washing to obtain the alginate-based porous carbon. The obtained porous carbon is uniform and consistent in morphology, rich in pores, large in specific surface area and reasonable in micro-pore, mesopore and macro-pore distribution. A super capacitor electrode prepared by the porous carbon is excellent in performance and good in cycling stability.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials and electrochemical capacitors, and in particular relates to an alginate-based porous carbon and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Carbon-based supercapacitors have broad application prospects in various energy storage devices due to their ultra-long cycle life, fast charge-discharge process, good rate characteristics, high energy density and power density. When porous carbon is used as an electrode material for a supercapacitor, it mainly uses the electric double layer for charging and discharging. The larger the effective ...

Claims

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Application Information

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IPC IPC(8): C01B32/342C01B32/348C01B32/324H01G11/24H01G11/34H01G11/44
CPCC01B32/342C01B32/348C01B32/324H01G11/24H01G11/34H01G11/44Y02E60/13
Inventor 韩奎华李明齐建荟牛胜利王梅梅滕召才赵建立
Owner SHANDONG UNIV
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