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Method for preparing nitrogen-rich carbon-coated cobalt-containing compound without solvent

A cobalt compound, solvent-free technology, which is applied in the field of carbon coating material preparation, can solve the problems of difficult product separation, large amount of solvent used, complicated steps, etc., and achieves the effects of overcoming the amount of solvent, simple operation and short process.

Active Publication Date: 2017-07-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects such as large amount of solvent used, cumbersome steps, and difficult product separation in the preparation method of carbon-coated materials in the prior art, the purpose of the present invention is to provide a simple and convenient operation, short cycle, and solvent-free preparation of nitrogen-rich carbon Method for coating materials containing cobalt compounds

Method used

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  • Method for preparing nitrogen-rich carbon-coated cobalt-containing compound without solvent
  • Method for preparing nitrogen-rich carbon-coated cobalt-containing compound without solvent
  • Method for preparing nitrogen-rich carbon-coated cobalt-containing compound without solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 120mg hollow nano-CoSnO 3 Mix and grind with 200mg 2-methylimidazole, place in a 100mL reaction kettle, seal, react at 200°C for 12h, after the reaction, cool, and directly calcinate at 700°C under the protection of argon, with a heating rate of 5°C per minute, About 100 mg of black solid was obtained. figure 1 It is its XRD picture, it can be observed that the cobalt-based compound coated with nitrogen-rich carbon prepared by this method and its precursor cobalt-containing compound have the same characteristic peaks, indicating that the type and crystal form of the substance before and after coating have not changed, and The diffraction peak of carbon is obviously found in it, which shows the reliability of the coating method. figure 2 It is its scanning electron microscope photo, and it can be seen that the cobalt-containing compound coated with nitrogen-rich carbon is composed of many nanocubes with a diameter of about 100nm, and a black carbon film is covered on t...

Embodiment 2

[0034] Mix and grind 150mg CoO and 500mg 2-methylimidazole, place it in a 100mL reactor and seal it at 180°C for 24h, after the reaction is completed, heat up at 10°C / min to 500°C in an argon atmosphere for 1h to obtain About 150mg of the product, the obtained nitrogen-rich carbon-coated CoO has a specific surface area of ​​268.5m 2 g -1 , greater than the specific surface area of ​​CoO (35m 2 g -1 ), the carbon content is 38%, the nitrogen content is about 12%, and the surface carbon layer thickness is about 35nm.

Embodiment 3

[0038] Mix and grind 100mg CoS and 100mg benzodimethylimidazole, put it in a 50mL reactor, seal it at 180°C for 12h, after the reaction, lower the temperature at 10°C / min to 500°C for 1h in an argon atmosphere After the reaction, about 80 mg of nitrogen-enriched carbon-coated material was obtained. The thermogravimetric results showed that the carbon content was 35%, the nitrogen content was about 10%, and the specific surface area was 367.6m 2 g -1 , the particle size is mainly distributed around 200nm, and the surface carbon layer thickness is around 3nm.

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Abstract

The invention discloses a method for preparing a nitrogen-rich carbon-coated cobalt-containing compound without a solvent. The method comprises grinding and mixing a cobalt-containing compound and a nitrogen-containing ligand, then placing the mixture in a high-pressure reactor, carrying out a reaction process at a temperature of 140 to 350 DEG C to obtain a precursor, and carbonizing the precursor at a temperature of 300 to 1000 DEG C in a protective atmosphere to obtain the nitrogen-rich carbon-coated cobalt-containing compound having a high specific surface area and a mesoporous and microporous structure. The method has simple processes, is free of a solvent, realizes a high yield and control of nitrogen content and carbon content, greatly reduces a production cost and is conducive to industrial production.

Description

technical field [0001] The invention relates to a method for preparing a nitrogen-rich carbon-coated cobalt-containing compound material, in particular to a fast and convenient preparation of nitrogen-rich carbon-coated cobalt-containing compound materials under solvent-free conditions through nitrogen-containing organic ligands and cobalt-containing compounds. The invention relates to a method for cobalt compound materials; it belongs to the technical field of preparation of carbon coating materials. Background technique [0002] Cobalt-containing compounds are very popular in the field of catalysis, energy storage, and gas storage due to their high catalytic activity, high specific energy, and potential storage and adsorption of gases. However, the presence of cobalt-containing compounds is unstable and easily soluble in catalytic reactions, and their volume expansion and easy pulverization in energy storage greatly limit the wide application of cobalt-containing compounds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/00C01B19/04
CPCC01B19/007C01G51/00C01G51/04C01G51/30C01P2002/72C01P2002/85C01P2002/88C01P2004/03C01P2004/04C01P2004/62C01P2004/80C01P2006/12
Inventor 纪效波邹国强侯红帅邱晓清
Owner CENT SOUTH UNIV
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