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Manganese dioxide composite nitrogen-sulfur double-doped porous carbon as well as preparation method and application thereof

A manganese dioxide and porous carbon technology, which is used in the manufacture of hybrid/electric double layer capacitors, electrodes of hybrid capacitors, etc., can solve the problems of lower energy density than batteries and limited practical applications.

Active Publication Date: 2021-05-18
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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  • Manganese dioxide composite nitrogen-sulfur double-doped porous carbon as well as preparation method and application thereof
  • Manganese dioxide composite nitrogen-sulfur double-doped porous carbon as well as preparation method and application thereof
  • Manganese dioxide composite nitrogen-sulfur double-doped porous carbon as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Dissolve thiourea and hydrochloric acid in deionized water at 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, take 5ml of the solution and inject them into cylindrical molds, and then drop 5ml into the step (1 ) to obtain an acidified thiourea solution, which was allowed to stand for 24 hours to prepare a block gel;

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

[0030] (4) The block gel after freeze-drying in step (3) was carbonized at 700°C for 2 hours under the protection of nitrogen to obtain manganese dioxide composite nitrogen-sulfur double-doped porous carbon.

Embodiment 2

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

Embodiment 3

[0034] The amount of potassium permanganate added in the step (2) is 0.06g, and all the other 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. The preparation method comprises the following steps of dissolving thiourea in a dilute acid solution firstly to prepare an acidified thiourea solution, dropwise adding the acidified thiourea solution into a mixed solution in which sodium alginate, potassium nitrate and potassium permanganate are dissolved, and cross-linking to obtain blocky gel; after washing and freeze-drying, carrying out one-step carbonization operation at a certain temperature and under the protection of nitrogen to obtain the manganese dioxide composite nitrogen-sulfur double-doped porous carbon. According to the method, the acidified thiourea and the sodium alginate molecular chains are cross-linked to obtain the gel, wherein the thiourea can serve as a nitrogen source and a sulfur source at the same time, and the potassium permanganate serves as a manganese source, and therefore the manganese dioxide composite nitrogen-sulfur double-doped porous carbon can be prepared through one-step carbonization. By changing the concentration of potassium permanganate, the pore structure of the porous carbon and the content of manganese dioxide can be regulated and controlled, and a supercapacitor taking the obtained porous carbon composite material as an electrode material shows good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a manganese dioxide composite nitrogen-sulfur double-doped porous carbon and its preparation method and application. Background technique [0002] Supercapacitors are new energy storage devices between traditional capacitors and chemical batteries. It follows the same basic principles 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 of traditional capacitors. At the same time, its electrode has a larger effective specific surface area and a thinner dielectric, making its specific capacitance much higher than that of traditional capacitors, which greatly improves the energy density. Its excellent characteristics make it have very broad application prospects in the electronics ...

Claims

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Application Information

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Patent Type & Authority Applications(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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