Nitrogen-doped carbon microsphere loaded with cobalt nano-particles and preparation method thereof, and applications

A nitrogen-doped carbon and cobalt nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor stability and high cost, and achieve improved dispersion and short synthesis cycle. , the effect of easy availability of raw materials

Active Publication Date: 2019-09-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a nitrogen-doped carbon microsphere loaded with cobalt nanopar

Method used

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  • Nitrogen-doped carbon microsphere loaded with cobalt nano-particles and preparation method thereof, and applications
  • Nitrogen-doped carbon microsphere loaded with cobalt nano-particles and preparation method thereof, and applications
  • Nitrogen-doped carbon microsphere loaded with cobalt nano-particles and preparation method thereof, and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1) Preparation of composite precursors of phenolic resin spheres and metal-organic frameworks

[0033] Add 0.2 g of phenolic resin microspheres and 3 g of dimethylimidazole into methanol (30 ml), and ultrasonically disperse to form dispersion A. Add 0.4 g of cobalt nitrate and 0.1 g of zinc nitrate into methanol (10 ml), and disperse to form solution B. The solutions of A and B were mixed, and the reaction mixture was placed in a water bath at 70°C and continuously stirred for 1-2 hours. After centrifugation, washing and drying at 70°C, a composite precursor of phenolic resin balls and metal organic frameworks (MOFs) was obtained.

[0034] 2) Preparation of nitrogen-doped carbon microspheres loaded with cobalt nanoparticles

[0035] The composite precursor of phenolic resin spheres and metal-organic framework materials was calcined in an inert atmosphere at 800°C for 2 hours, washed with a 1:1 mixture of concentrated hydrochloric acid and water, dried at 70°C, and then...

Embodiment 2

[0039] 1) Preparation of composite precursors of phenolic resin spheres and metal-organic frameworks

[0040] Add 0.2 g of phenolic resin microspheres and 3 g of dimethylimidazole into methanol (30 ml), and ultrasonically disperse to form dispersion A. 0.4 g of cobalt nitrate was added to methanol (10 ml) and dispersed to form solution B. The solutions of A and B were mixed, and the reaction mixture was placed in a water bath at 70°C for 1 hour of continuous stirring. After centrifugation, washing and drying at 70°C, the composite precursor of phenolic resin spheres and metal organic frameworks (MOFs) was obtained.

[0041] 2) Preparation of nitrogen-doped carbon microspheres loaded with cobalt nanoparticles

[0042] The composite precursor of phenolic resin spheres and metal-organic framework materials was calcined at 800°C for 2 hours in an inert atmosphere, washed with a 1:1 mixture of concentrated hydrochloric acid and water, dried at 70°C, and then calcined at 800°C for ...

Embodiment 3

[0045] Add 0.2 g of phenolic resin microspheres and 4 g of dimethylimidazole into methanol (30 ml), and ultrasonically disperse to form dispersion A. Add 0.4 g of cobalt nitrate and 0.3 g of zinc nitrate into methanol (10 ml), and disperse to form solution B. The solutions of A and B were mixed, and the reaction mixture was placed in a water bath at 70°C and continuously stirred for 1 h. After centrifugation and washing at 70°C, the composite precursor of phenolic resin spheres and metal-organic frameworks (MOFs) was obtained.

[0046] 2) Preparation of nitrogen-doped carbon microspheres loaded with cobalt nanoparticles

[0047] The composite precursor of phenolic resin spheres and metal-organic framework materials was calcined at 900°C in an inert atmosphere for 2 hours, washed with a 1:1 mixture of concentrated hydrochloric acid and water, dried at 70°C, and then calcined at 900°C for 2 hours in an inert atmosphere. Nitrogen-doped carbon microspheres loaded with cobalt nano...

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Abstract

The present invention relates to a nitrogen-doped carbon microsphere loaded with cobalt nano-particles and a preparation method thereof. The material can be taken as an oxygen reduction reaction active electrode material. The microsphere is a yolk-shell structure microsphere with the diameter of 500-800 nm, the surface of the microsphere is uniformly loaded with nano-sized cobalt particles, and the size of each nano-sized cobalt particle is 10-80 nm. According to the microsphere, the nitrogen-doped carbon microsphere loaded with the cobalt nano-particles is prepared by adopting the method of composite carbonization of resin ball(s) and metal organic frame material(s) for the first time; the catalyst improves the dispersibility of cobalt atoms via nitrogen doping, so that catalytic site exposure is increased, and the catalytic activity rises; and the method has the advantages of simple process, short synthesis cycle and cheap and easily available raw materials.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrocatalysis, and in particular relates to nitrogen-doped carbon microspheres loaded with cobalt nanoparticles and a preparation method thereof. The material can be used as an active electrode material for oxygen reduction reaction. Background technique [0002] Nowadays, the problem of environmental pollution caused by fossil energy is becoming more and more serious, and human society has realized the importance of replacing fossil energy with renewable energy. At present, solar energy, wind energy, geothermal energy, etc. have all been developed and have abundant reserves; however, they have not been applied on a large scale. The main reason is the lack of corresponding energy storage devices with high energy density and long cycle life. This factor makes it difficult for the electricity generated by renewable energy to be applied on a large scale in vehicles and other tools that ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/06B82Y30/00
CPCH01M4/9083H01M4/9041B82Y30/00H01M12/06
Inventor 麦立强刘煜恒周亮
Owner WUHAN UNIV OF TECH
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