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
4 Cites 31 Cited by

AI-Extracted 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...
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Method used

Fig. 3 (a) is the nitrogen adsorption-desorption curve that embodiment 1 makes sample, as can be seen from Fig. 3 (a): when relative pressure P/PO is 0.4, hysteresis loop (adsorption type IV) occurs, This explanation catalyzer is mesoporous material, and specific surface area is 352m2g-1; Fig. 3 (b) is the apert...
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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.

Application Domain

Material nanotechnologyPhysical/chemical process catalysts +1

Technology Topic

Cvd grapheneDecomposition +20

Image

  • 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(7)
  • Comparison scheme(1)

Example Embodiment

[0041] Example 1: Co@NC 1:104 -C-800(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 1:104 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamine, C is glucose, the mass ratio of NC to C is 15:1, 800 means the pyrolysis temperature is 800℃)
[0042] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamide and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 3h at 80℃ in an oil bath to fully dissolve and mix uniformly to obtain solution B; place the evenly mixed solution in an air drying oven Dry at 80℃ for 12h to obtain the catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under the protection of nitrogen for 30℃ min -1 Program the temperature to 800℃, calcinate for 2h, and get Co@NC after natural cooling 1:104 -C-800 catalyst.

Example Embodiment

[0043] Example 2: Co@NC 1:104 -C-700(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 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℃)
[0044] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamine and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 0.5h in an oil bath at 100°C to fully dissolve and mix uniformly to obtain solution B; dry the evenly mixed solution in the air Dry in a box at 80℃ for 12 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under nitrogen protection at 15℃ min -1 The temperature is increased to 700℃ and calcined for 45h, and Co@NC is obtained after natural cooling 1:104 -C-700 catalyst.

Example Embodiment

[0045] Example 3: Co@NC 200:7 -C-900(Co refers to Co(NO 3 )·6H 2 O, NC is dicyandiamide, 200:7 is Co(NO 3 )·6H 2 The molar ratio of O to dicyandiamine, C is glucose, the mass ratio of NC to C is 1:30, 900 means the pyrolysis temperature is 900℃)
[0046] Add 0.05g Co(NO 3 )·6H 2 O, 1.5g dicyandiamine and 0.1g glucose are dissolved in 20ml deionized water to obtain solution A; stir for 25h at 80°C in an oil bath to fully dissolve and mix uniformly to obtain solution B; dry the uniformly mixed solution in an inert atmosphere Dry in a box at 80℃ for 12 hours to obtain a catalyst precursor; place the dried precursor in a mortar, grind evenly and place it in a quartz boat, under nitrogen protection at 15℃ min -1 Program the temperature to 900℃, calcinate for 0.5h, and get Co@NC after natural cooling 1:104 -C-900 catalyst.

PUM

PropertyMeasurementUnit
Aperture2.0 ~ 30.0nm
Diameter10.0nm
Specific surface area352.0m²/g

Description & Claims & Application Information

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