A kind of manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application

A manganese dioxide, porous carbon technology, applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of limited practical application and lower energy density than batteries

Active Publication Date: 2022-07-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although supercapacitors have better power density than fuel cells and lithium-ion batteries, their energy density is far lower than that of batteries, which limits its practical application.

Method used

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  • A kind of manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application
  • A kind of manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application
  • A kind of manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve thiourea and hydrochloric acid in deionized water in a molar ratio of 1:2 to prepare an acidified thiourea solution with a thiourea concentration of 0.05 mol / L;

[0028] (2) Add 0.3g of potassium nitrate and 0.02g of potassium permanganate to 50ml of sodium alginate solution with a mass concentration of 2%, stir evenly, and inject 5ml of the solution into the cylindrical mold respectively, and then drop 5ml of step (1). ) to obtain an acidified thiourea solution, and let stand for 24 hours to prepare a bulk gel;

[0029] (3) washing the bulk gel obtained in step (2) with deionized water until the washing liquid is neutral, and then freeze-drying;

[0030] (4) Carbonizing the lyophilized bulk gel in step (3) at 700° C. under nitrogen protection for 2 h to obtain manganese dioxide composite nitrogen-sulfur double-doped porous carbon.

Embodiment 2

[0032] The amount of potassium permanganate added in step (2) was 0.04 g, and the remaining steps were the same as in Example 1.

Embodiment 3

[0034] The amount of potassium permanganate added in step (2) is 0.06g, and the remaining steps are the same as in Example 1

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Abstract

The invention discloses a preparation method of manganese dioxide composite nitrogen-sulfur double-doped porous carbon. First, dissolve thiourea in a dilute acid solution to make an acidified thiourea solution, then drop the acidified thiourea solution into a mixed solution of sodium alginate, potassium nitrate and potassium permanganate, and obtain a block after cross-linking. gel. After washing, freeze-drying, and one-step carbonization at a certain temperature and nitrogen protection, the manganese dioxide composite nitrogen-sulfur double-doped porous carbon is obtained. The present invention utilizes acidified thiourea and sodium alginate molecular chains to cross-link to obtain gel, wherein thiourea can be used as nitrogen source and sulfur source at the same time, and potassium permanganate can be used as manganese source, so that carbon dioxide can be prepared in one step. Manganese-complexed nitrogen-sulfur double-doped porous carbon. By changing the concentration of potassium permanganate, the pore structure of porous carbon and the content of manganese dioxide can be regulated, and the supercapacitor using the obtained porous carbon composite as the electrode material exhibits good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and particularly relates to a manganese dioxide composite nitrogen-sulfur double-doped porous carbon and a preparation method and application thereof. Background technique [0002] Supercapacitors are new energy storage devices between traditional capacitors and chemical batteries. It follows the same basic principle as traditional capacitors, and has the characteristics of fast charging and discharging speed, high efficiency, long cycle life, high power density, safety and environmental protection, and wide operating temperature range. At the same time, its electrodes have a larger effective specific surface area and a thinner dielectric, making its specific capacitance much higher than that of traditional capacitors and greatly improving the energy density. Its excellent characteristics make it have very broad application prospects in the electronics industry, electric veh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/32H01G11/46H01G11/86
CPCH01G11/24H01G11/30H01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 赵玉来朱中正王安君肖龙强侯琳熙
Owner FUZHOU UNIV
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