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Transition metal nanoparticle catalyst coated with graphitized carbon layer and preparation method of transition metal nanoparticle catalyst

A nanoparticle and transition metal technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of poor catalytic activity and efficiency, low catalyst loading, poor cycle durability, etc. problems, to achieve the effect of abundant reserves, small particle size and low cost

Active Publication Date: 2021-09-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of low catalyst loading, poor catalytic activity and efficiency, and poor cycle durability of zinc-air batteries in the prior art, the present invention proposes the use of a graphitized carbon layer-coated transition metal nanoparticle catalyst to solve the problem Difficulties in the practical application of zinc-air batteries

Method used

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  • Transition metal nanoparticle catalyst coated with graphitized carbon layer and preparation method of transition metal nanoparticle catalyst
  • Transition metal nanoparticle catalyst coated with graphitized carbon layer and preparation method of transition metal nanoparticle catalyst
  • Transition metal nanoparticle catalyst coated with graphitized carbon layer and preparation method of transition metal nanoparticle catalyst

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Embodiment 1

[0048] Firstly, a cobalt-iron hydroxide array supported on graphene is prepared, and 0.5 g of cobalt sulfate and 0.25 g of ferrous sulfate are dispersed in 100 ml of water and dissolved evenly. Then add 10 milliliters of 1 mg / ml uniformly dispersed graphene aqueous dispersion, stir at a constant speed for 30 minutes, then add 5 milliliters of ammonia water dropwise as a precipitating agent, continue to stir for 30 minutes and then centrifuge to obtain the hydroxide loaded on the graphene. Cobalt iron nanosheet arrays.

[0049] Then the above-mentioned cobalt-iron hydroxide array loaded on the graphene substrate is dispersed in 40 milliliters of water and 40 milliliters of ethanol mixed solution, stirred evenly until there is no obvious precipitation, and then 80 milligrams of trishydroxymethylaminomethane is used as the initiator of the polymerization reaction Dissolve in 40 ml of water and stir evenly, add the above mixed solution, and stir at a constant speed for 30 minutes....

Embodiment 2

[0067] A catalyst in which nitrogen-doped graphitized carbon layer-coated transition metal nanoparticles was prepared in the same manner as in Example 1. The difference is that cobalt iron hydroxide is changed to cobalt hydroxide of equal mass (that is, only 0.75 g of cobalt sulfate is added in the process of preparing the hydroxide array), and the obtained catalyst is a high-loaded graphitized carbon layer coated cobalt nanometer. granular catalyst. The catalyst basically maintains a similar shape, wherein the content of metal cobalt is 41%, and the particle size of the catalyst is about 15nm.

Embodiment 3

[0069]A catalyst in which nitrogen-doped graphitized carbon layer-coated transition metal nanoparticles was prepared in the same manner as in Example 1. The difference is that cobalt iron hydroxide is changed to nickel iron hydroxide of equal quality (that is, the feed metal is changed to 0.5g nickel salt and 0.25g iron salt in the process of preparing the hydroxide array), and the resulting catalyst is a high loading Graphitized carbon layer-coated nickel-iron alloy nanoparticle catalysts. The catalyst basically maintains a similar shape, wherein the content of metal nickel and iron is 47%, and the particle size of the catalyst is about 15nm.

[0070] Example 3

[0071] A catalyst with graphitized carbon layer-coated transition metal nanoparticles was prepared in the same manner as in Example 1. The difference is that the polymer is replaced by an equal mass of polymerized phenolic resin, and the obtained catalyst is a graphitized carbon layer-coated cobalt-iron alloy nanop...

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Abstract

The invention provides a high-load graphitized carbon layer coated transition metal nanoparticle catalyst and a preparation method of the transition metal nanoparticle catalyst. The graphitized carbon layer coated transition metal nanoparticle catalyst is composed of core-shell structure nanoparticles anchored by porous carbon networks distributed on a carbon substrate, wherein the core is transition metal nanoparticles, the shell is a graphitized carbon layer, the transition metal nanoparticles are coated with the graphitized carbon layer, and the core-shell structure of the metal nanoparticles is fixed on the carbon substrate by the porous carbon network. The catalyst is obtained by using a carbon-substrate supported metal hydroxide as a metal source, coating a high-molecular polymer on the outer layer of a transition metal hydroxide through a polymerization reaction and then carrying out heat treatment. The graphitized carbon layer coated transition metal nanoparticle catalyst prepared in the invention has the advantages of high metal loading capacity, small particle size and uniform distribution. The catalyst is excellent in oxygen reduction and oxygen evolution reaction catalytic performance, and has huge potential application value in many industrial catalysts or other scientific fields.

Description

technical field [0001] The invention relates to the field of catalysts and batteries, in particular to a graphitized carbon layer-coated transition metal nanoparticle catalyst and a preparation method and application thereof. Background technique [0002] Since entering the industrialized society, the rapid increase in the consumption of fossil energy has made the existing storage exhausted within a few centuries. Therefore, it is urgent to develop sustainable energy and develop new clean energy conversion devices. As a branch type of fuel cells, aqueous rechargeable zinc-air batteries have attracted much attention in various new clean energy conversion devices due to their high theoretical energy density, abundant raw materials, environmental friendliness, safety and low cost. The zinc-air battery system uses potassium hydroxide aqueous solution with high ionic conductivity as the electrolyte. Compared with lithium-ion batteries using organic electrolytes, it has higher saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083H01M12/08B82Y30/00B82Y40/00Y02E60/50
Inventor 胡劲松唐堂万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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