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Preparation method and application of nitrogen-doped porous carbon-coated cobalt nanoparticle composite material

A nitrogen-doped porous carbon and composite material technology, applied in the field of electrochemical energy, can solve the problems of loss of active sites, weak interaction between atoms, etc., to improve stability, improve oxygen reduction performance, and protect from corrosion Effect

Active Publication Date: 2019-07-19
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the weak interaction between atoms in the general precursor calcination process, carbon exists purely as a carrier function, and the incorporation of nitrogen is also less, which will lose a part of the active sites.

Method used

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  • Preparation method and application of nitrogen-doped porous carbon-coated cobalt nanoparticle composite material
  • Preparation method and application of nitrogen-doped porous carbon-coated cobalt nanoparticle composite material

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Embodiment 1

[0044] The preparation steps of the composite material of nitrogen-doped porous carbon-coated cobalt nanoparticles in this embodiment are as follows:

[0045]1. Use an electronic balance to weigh 1.245g of cobalt acetate tetrahydrate and dissolve it in 100mL of deionized water, and stir for 30min to form a transparent solution;

[0046] 2. Weigh 4.2g of dicyandiamide and add it to the solution in the above step 1, heat to 80°C at the same time, and stir until the dicyandiamine is completely dissolved to form a transparent solution;

[0047] 3. Weigh 10.5g of citric acid monohydrate, dissolve in the solution of the above step 2, and continue to stir for 6h;

[0048] 4. Evaporate the solution prepared in the above step 3 to dryness at 120°C;

[0049] 5. Put the solid obtained in step 4 into a tube furnace, and burn it at 900°C for 5 hours in a high-purity nitrogen atmosphere to obtain a black powder sample, which is a composite material of nitrogen-doped porous carbon-coated co...

Embodiment 2

[0055] The preparation steps of the composite material of nitrogen-doped porous carbon-coated cobalt nanoparticles in this embodiment are as follows:

[0056] 1. Use an electronic balance to weigh 1.245g of cobalt acetate tetrahydrate and dissolve it in 100mL of deionized water, and stir for 30min to form a transparent solution;

[0057] 2. Weigh 8.4g of dicyandiamine and add it to the solution in the above step 1, heat to 80°C at the same time, and stir until the dicyandiamine is completely dissolved to form a transparent solution;

[0058] 3. Weigh 10.5g of citric acid monohydrate, dissolve in the solution of the above step 2, and continue to stir for 6h;

[0059] 4. Evaporate the solution prepared in the above step 3 to dryness at 120°C;

[0060] 5. Put the solid obtained in step 4 into a tube furnace, and burn it at 900°C for 5 hours in a high-purity nitrogen atmosphere to obtain a black powder sample, which is a composite material of nitrogen-doped porous carbon-coated c...

Embodiment 3

[0063] The preparation steps of the composite material of nitrogen-doped porous carbon-coated cobalt nanoparticles in this embodiment are as follows:

[0064] 1. Use an electronic balance to weigh 1.245g of cobalt acetate tetrahydrate and dissolve it in 100mL of deionized water, and stir for 30min to form a transparent solution;

[0065] 2. Weigh 4.2g of dicyandiamide and add it to the solution in the above step 1, heat to 80°C at the same time, and stir until the dicyandiamine is completely dissolved to form a transparent solution;

[0066] 3. Weigh 10.5g of citric acid monohydrate, dissolve in the solution of the above step 2, and continue to stir for 6h;

[0067] 4. Evaporate the solution prepared in the above step 3 to dryness at 120°C;

[0068] 5. Put the solid obtained in step 4 into a tube furnace, and burn it at 800° C. for 5 hours under a high-purity nitrogen atmosphere to obtain a black powder sample, which is a composite material of nitrogen-doped porous carbon-coa...

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Abstract

The invention provides a preparation method and application of a nitrogen-doped porous carbon-coated cobalt nanoparticle composite material. The preparation method comprises the following steps: uniformly dispersing a carbon source precursor, a nitrogen source precursor and soluble salt of transition metal ions in a solvent according to a ratio, then performing drying to obtain a solid powder precursor, and calcining the solid powder precursor in a protective atmosphere to obtain black powder, namely the composite material. The composite material has efficient oxygen reduction catalysis performances and can be applied to proton exchange membrane fuel cells, alkaline fuel cells and metal-air batteries. The catalyst has the advantages that a pore structure is generated in the heat treatmentprocess and is uniformly dispersed; the carbon source, the nitrogen source and the metal source interact with one another to stabilize active elements and effectively improve the catalytic activity. Compared with a catalyst with commercial carbon as a carbon source, the prepared composite material has better oxygen reduction catalytic activity and is an efficient non-noble metal oxygen reduction catalyst.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, and in particular relates to a preparation method and application of a composite material of nitrogen-doped porous carbon-coated cobalt nanoparticles. Background technique [0002] At present, the world is facing the shortage of fossil energy and increasingly severe environmental problems, and energy development is related to the development of economy and society. In order to solve the problems of energy crisis and environmental pollution, it is necessary to develop sustainable green energy and optimize the energy structure , to improve energy efficiency. [0003] Fuel cells and metal-air batteries have the advantages of clean and pollution-free, high energy density, and high conversion efficiency, which have attracted widespread attention and have great development potential. However, the kinetics of the oxygen reduction reaction in this type of battery is slow, and the application of eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083Y02E60/50
Inventor 章俊良夏国锋李琳李晓琳沈水云杨琨冯奇闫晓晖柯长春
Owner SHANGHAI JIAO TONG UNIV
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