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Method of preparing nitrogen and sulfur co-doped activated carbon for supercapacitor

A supercapacitor, double doping technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of difficult control, uncontrollable, violent reaction, etc., and achieve the effects of simple operation, improved yield, and wide source of raw materials

Active Publication Date: 2018-05-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Document 3 (Journal of Power Source, 331:373-381.) utilizes sodium thiosulfate as a dopant, and in the pyrolysis process, sodium thiosulfate is used both as a dopant and as an explosive to prepare nitrogen-sulfur double-doped Heteroporous flake carbon, but the reaction is violent and difficult to control, and the ratio of the molar ratio of nitrogen to sulfur is a fixed value of 3.649, and the amount of nitrogen and sulfur is also uncontrollable

Method used

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  • Method of preparing nitrogen and sulfur co-doped activated carbon for supercapacitor
  • Method of preparing nitrogen and sulfur co-doped activated carbon for supercapacitor
  • Method of preparing nitrogen and sulfur co-doped activated carbon for supercapacitor

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Effect test

Embodiment 1

[0035] A preparation method of nitrogen-sulfur double-doped activated carbon for supercapacitors, the specific steps are as follows:

[0036] (1) Soak the walnut shell powder in the sulfuric acid-urea solution for 48 hours, take it out and dry it in vacuum at 60°C for 12 hours to obtain the dry product. When soaking, just ensure that the walnut shell powder can be completely submerged, wherein the sulfuric acid-urea solution has a mass concentration of 10 % sulfuric acid solution and urea solution with a mass concentration of 10% are mixed in a volume ratio of 2:3;

[0037] (2) Pre-oxidize the dried product at 250° C. for 1 h to obtain the pre-oxidized product;

[0038] (3) Place the pre-oxidized product in a tube furnace, and carbonize it in a nitrogen atmosphere at 600° C. for 2 hours to obtain a carbonized product;

[0039] (4) Mix the carbonized product with a mass ratio of 3:1 and potassium hydroxide, place it in a tube furnace, and activate it in a nitrogen atmosphere a...

Embodiment 2～6

[0046] A preparation method of nitrogen-sulfur double-doped activated carbon for supercapacitor, basically the same as embodiment 1, the difference is that the sulfuric acid-urea solution is a sulfuric acid solution with a mass concentration of 10% and a urea solution with a mass concentration of 10% in different volumes After the preparation, the same method as in Example 1 was used to test the specific capacitance of nitrogen-sulfur double-doped activated carbon for supercapacitors. The volume ratio of the sulfuric acid solution with a mass concentration of 10% and the urea solution with a mass concentration of 10% in different embodiments, the yield of nitrogen-sulfur double-doped activated carbon for supercapacitors that are finally made, the ratio of the molar ratio of nitrogen and sulfur And the specific capacitance is shown in the table below:

[0047]

[0048] As can be seen from the data in the table, when the selected raw materials are the same, nitrogen-sulfur do...

Embodiment 7

[0050] A preparation method of nitrogen-sulfur double-doped activated carbon for supercapacitors, the specific steps are as follows:

[0051] (1) Soak the chestnut shell powder in sulfuric acid-urea solution for 48 hours, then take it out and vacuum dry it at 60°C for 12 hours to obtain the dry product. When soaking, it is enough to ensure that the chestnut shell powder can be completely submerged, wherein the sulfuric acid-urea solution has a mass concentration of 10 % sulfuric acid solution and urea solution with a mass concentration of 10% are mixed in a volume ratio of 2:3;

[0052] (2) Pre-oxidize the dried product at 250° C. for 1 h to obtain the pre-oxidized product;

[0053] (3) Place the pre-oxidized product in a tube furnace, and carbonize it in a nitrogen atmosphere at 600° C. for 2 hours to obtain a carbonized product;

[0054] (4) Mix the carbonized product with a mass ratio of 3:1 and potassium hydroxide, place it in a tube furnace, and activate it in a nitrogen...

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Abstract

The invention relates to a method of preparing nitrogen and sulfur co-doped activated carbon for a supercapacitor. The method comprises specific steps: (1) biomass cellulose and / or lignin powder are / is subjected to soaking treatment in a sulphuric acid-urea solution, and after drying, a dried product is obtained; (2) the dried product is subjected to preoxidation for 1 h under 250 DEG C to obtaina preoxidation product; (3) the preoxidation product is placed in a tube furnace and is subjected to carbonization for 2 h in an inert atmosphere under 600 DEG C to obtain a carbonization product; (4)the carbonization product and potassium hydroxide are mixed and are then placed in the tube furnace for activation for 1 h in the inert atmosphere under 800 DEG C to obtain an activation product; and(5) the activation product is placed in a hydrochloric acid solution for being stirred for 24 h, deionized water is then used for cleaning to neutrality, vacuum drying for 12 h under 60 DEG C is carried out, and thus, the nitrogen and sulfur co-doped activated carbon for the supercapacitor can be obtained. The method is simple and convenient to operate, the nitrogen and sulfur element doping proportion is easy to regulate, the yield of the prepared activated carbon is high, and when the activated carbon is used as a capacitor electrode material, the specific capacitance is high.

Description

technical field [0001] The invention belongs to the field of preparation of electrode materials for supercapacitors, and relates to a method for preparing activated carbon double-doped with nitrogen and sulfur for supercapacitors. Background technique [0002] As a new type of electrochemical energy conversion and energy storage device, supercapacitor has been widely used in commercial and industrial fields due to its high power density, wide operating temperature range and long cycle life. As the core component of supercapacitors, electrode materials play an important role in the performance of supercapacitors. Electrode materials for supercapacitors can be classified into transition metal oxide materials, conductive polymer materials, and carbon materials. Compared with carbon materials, transition metal oxide materials are expensive, and the cycle performance of conductive polymer materials is unstable, while carbon materials have the advantages of good electrical conduc...

Claims

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Application Information

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IPC IPC(8): H01G11/34H01G11/44H01G11/30
CPCH01G11/30H01G11/34H01G11/44Y02E60/13
Inventor 吴琪琳姜可茂冉敏苏晗
Owner DONGHUA UNIV
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