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Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst

A core-shell structure and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, structural parts, etc., can solve the problems that the preparation process needs to be further simplified, the size range of metal particles is large, and it is unfavorable for large-scale preparation. Achieve the effects of low raw material prices, inhibit growth and agglomeration, and facilitate large-scale production

Inactive Publication Date: 2019-08-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst has a large range of metal particle sizes in the preparation process, and the process is complicated, which is not conducive to large-scale preparation.
[0006] In summary, the M-N-C catalyst has good catalytic performance for ORR, but the preparation process needs to be further simplified

Method used

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  • Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst
  • Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst
  • Co@NC high-dispersion core-shell structure catalyst, and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: Co@NC 1:104 -C-800(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamine, 1:104 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamide, C is glucose, the mass ratio of NC to C is 15:1, 800 means the pyrolysis temperature is 800°C)

[0042] 0.05g Co(NO 3 )·6H 2 O, 1.5g of dicyandiamide and 0.1g of glucose were dissolved in 20ml of deionized water to obtain solution A; stirred in an oil bath at 80°C for 3 hours to fully dissolve and mix uniformly to obtain solution B; put the uniformly mixed solution in an air drying oven Dry at 80°C for 12 hours to obtain the catalyst precursor; place the dried precursor in a mortar, grind it evenly, place it in a quartz boat, and place it under nitrogen protection at 30°C for min -1 The temperature was programmed to 800 °C for 2 h, and Co@NC was obtained after natural cooling. 1:104 -C-800 catalyst.

Embodiment 2

[0043] Example 2: Co@NC 1:104 -C-700 (Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamine, 1:104 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamide, C is glucose, the mass ratio of NC to C is 15:1, 700 means the pyrolysis temperature is 700°C)

[0044] 0.05g Co(NO 3 )·6H 2 O, 1.5g of dicyandiamide and 0.1g of glucose were dissolved in 20ml of deionized water to obtain solution A; stirred in an oil bath at 100°C for 0.5h to fully dissolve and mix uniformly to obtain solution B; the uniformly mixed solution was dried in the air Dry in the box at 80°C for 12h to obtain the catalyst precursor; place the dried precursor in a mortar, grind it evenly, place it in a quartz boat, and place it under the protection of nitrogen at 15°C for min -1 The temperature was programmed to 700°C for 45 hours, and Co@NC was obtained after natural cooling. 1:104 -C-700 catalyst.

Embodiment 3

[0045] Example 3: Co@NC 200:7 -C-900 (Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamine, 200:7 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamide, C is glucose, the mass ratio of NC to C is 1:30, 900 means the pyrolysis temperature is 900°C)

[0046] 0.05g Co(NO 3 )·6H 2 O, 1.5g of dicyandiamide and 0.1g of glucose were dissolved in 20ml of deionized water to obtain solution A; stirred in an oil bath at 80°C for 25 hours to fully dissolve and mix uniformly to obtain solution B; dry the uniformly mixed solution in an inert atmosphere Dry in the box at 80°C for 12h to obtain the catalyst precursor; place the dried precursor in a mortar, grind it evenly, place it in a quartz boat, and place it under the protection of nitrogen at 15°C for min -1 The temperature was programmed to 900°C for 0.5h, and Co@NC was obtained after natural cooling. 1:104 -C-900 catalyst.

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Abstract

The invention discloses a Co@NC high-dispersion core-shell structure catalyst, and a preparation method and an application of the catalyst, and belongs to the technical field of energy source materials and electrochemistry. The preparation method of the catalyst comprises the steps of taking glucose as a C source, taking cyanoguanidine as a C-N source, taking Co(No3).6H2O as a Co source, and performing high temperature calcination. The cyanoguanidine performs high temperature decomposition to generate two-dimensional flaky g-C3N4; the glucose performs high temperature decomposition to generatea carbon intermediate and a metal species which are inserted into flakes of g-C3N4; and Co nanoparticles coated by an N-C layer in the catalyst are uniformly dispersed on a graphene carbon layer. Thecatalyst can serve as a cathode oxygen reduction electrocatalyst of a metal-air battery and a fuel battery. The catalyst is cheap and easy obtaining in raw material, and simple in preparation technology; amplification production is facilitated; in-situ decomposition of the cyanoguanidine provides rich N doped active sites for the catalyst; rich mesoporous structures are formed; the activity of the catalyst is improved; a channel is provided for transfer and transport of reaction participation substances in an ORR process; a mass transfer demand of a reaction process is met; and the catalyst is good in stability and high in methanol resistance.

Description

technical field [0001] The invention belongs to the technical field of energy materials and electrochemistry, and relates to a cathode oxygen reduction reaction electrocatalyst, in particular to a Co@NC highly dispersed core-shell structure catalyst, a preparation method and an application thereof. Background technique [0002] In recent years, fuel cells have attracted extensive attention from scholars at home and abroad because of their advantages such as economical efficiency and environmental protection. However, the cathode oxygen reduction reaction (ORR) of fuel cells suffers from a slow kinetic process. Pt-based catalysts are currently the best and most widely used fuel cell ORR catalysts, but Pt-based electrocatalysts are poor in stability and high in price, which limits the large-scale commercial use of fuel cells, so the development of catalysts with high catalytic activity and stability , corrosion-resistant, and low-cost catalysts have important practical signif...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B01J27/24B82Y30/00B82Y40/00
CPCH01M4/8825H01M4/9041H01M4/9083B82Y30/00B82Y40/00B01J27/24B01J35/396Y02E60/50
Inventor 李光兰杨贝贝徐晓存曹硕
Owner DALIAN UNIV OF TECH
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