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Preparation method of nitrogen and carbon doped cobalt molybdenum sulfide counter electrode catalyst with adjustable yolk-shell structure

A cobalt molybdenum sulfide, shell structure technology, applied in physical/chemical process catalysts, chemical instruments and methods, circuits, etc., can solve the problems of shedding DSSC battery circuits, poor adhesion of carbon materials, and decreased battery efficiency, etc. Effects of stability, enhanced specific surface area, and excellent electrocatalytic performance

Active Publication Date: 2019-12-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has certain defects: first, because the carbon material is black, opaque and opaque, the light entering the battery is blocked, and the efficiency of the battery is greatly reduced; The electrical circuit of the DSSC battery is short-circuited due to the detachment of the conductive glass

Method used

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  • Preparation method of nitrogen and carbon doped cobalt molybdenum sulfide counter electrode catalyst with adjustable yolk-shell structure
  • Preparation method of nitrogen and carbon doped cobalt molybdenum sulfide counter electrode catalyst with adjustable yolk-shell structure
  • Preparation method of nitrogen and carbon doped cobalt molybdenum sulfide counter electrode catalyst with adjustable yolk-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Dissolve 4.5 g of cobalt nitrate hexahydrate and 4.5 g of 2-methylimidazole in 450 mL of methanol respectively. After the two solutions are completely dissolved, mix the two solutions uniformly, stir for 10 min and then stand for 24 h, centrifuge and dry to obtain purple ZIF-67 polyhedron. Dissolve 45 mg of ammonium molybdate and 300 µL of 20% ammonium sulfide solution in 5 mL of water, add 20 µL of ammonia, and in an oil bath at 50 ℃ for 0.5 h to obtain an ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution and stir at room temperature for 0.5 h. After centrifugation, washing and drying, a purple black cobalt molybdenum sulfide coated ZIF-67 intermediate ZIF-67 is obtained. @Co-MoS 2 . Add 100 mg ZIF-67@Co-MoS 2 After the intermediate and 200 mg sulfur powder are ground and mixed uniformly, they are placed in a porcelain boat and heated to 300 ℃ in a tube furnace for 1.5 h at a he...

Embodiment 2

[0034] Dissolve 4.64 g of cobalt nitrate hexahydrate in 464 mL of methanol, and dissolve 5.24 g of 2-methylimidazole in 524 mL of methanol. After the two solutions are completely dissolved, mix the two solutions uniformly, stir for 10 minutes and then stand for 24 hours, centrifuge Dry to obtain purple ZIF-67 polyhedron. Dissolve 70 mg of ammonium molybdate and 500 µL of 20% ammonium sulfide solution in 7.8 mL of water, add 36 µL of ammonia, and in an oil bath at 60 ℃ for 0.5 h to obtain an ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution and stir at room temperature for 0.5 h. After centrifugation, washing and drying, a purple black cobalt molybdenum sulfide coated ZIF-67 intermediate ZIF-67 is obtained. @Co-MoS 2 . Add 100 mg of the above ZIF-67@Co-MoS 2 After the intermediate and 200 mg sulfur powder are ground and mixed uniformly, they are placed in a porcelain boat and heated to 3...

Embodiment 3

[0036] Dissolve 4.64 g of cobalt nitrate hexahydrate in 464 mL of methanol, dissolve 5.24 g of 2-methylimidazole in 524 mL of methanol, mix the two solutions uniformly after they are completely dissolved, stir for 10 minutes and then stand for 24 hours, centrifuge Dry to obtain purple ZIF-67 polyhedron. Dissolve 140 mg of ammonium molybdate and 1077 µL of 20% ammonium sulfide solution in 15.6 mL of water, add 83 µL of ammonia, and in an oil bath at 60 ℃ for 0.5 h to obtain an ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution and stir at room temperature for 1 h. After centrifugation, washing and drying, a purple-black cobalt-molybdenum sulfide coated ZIF-67 intermediate ZIF-67 is obtained. @Co-MoS 2 . Add 100 mg of the above ZIF-67@Co-MoS 2 After the intermediate and 200 mg sulfur powder are ground and mixed uniformly, they are placed in a porcelain boat and heated to 400 ℃ in a tube fu...

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Abstract

The invention discloses a preparation method of a nitrogen and carbon-doped cobalt molybdenum sulfide NC-CoS2@Co-MoS2 catalyst with an adjustable yolk-shell structure. The preparation method comprisesthe following steps: dissolving ammonium sulfide and ammonium molybdate in water, adding ammonia water, carrying out an oil bath reaction, adding the obtained solution to a ZIF-67 polyhedral dispersion, performing mixing, and then performing stirring to obtain an intermediate ZIF-67@Co-MoS2; and further carrying out high-temperature vulcanization on the intermediate to obtain the NC-CoS2@Co-MoS2catalyst with the yolk-shell structure. The shell thickness, the core size and the yolk-shell spacing are controlled by regulating the specific reaction time and the reaction mass ratio to form the catalyst with different morphological structures in order to achieve different catalytic effects. The prepared catalyst has the advantages of high specific surface area, high porosity and good electro-catalytic performance, and is used for a dye-sensitized solar cell to achieve a photoelectric conversion efficiency of 9.38%.

Description

Technical field [0001] The invention belongs to the field of material preparation, and specifically relates to a nitrogen-carbon doped cobalt-molybdenum sulfide catalyst NC-CoS with a controllable egg yolk-shell structure 2 @Co-MoS 2 The preparation method. Background technique [0002] Based on the excessive development and excessive consumption of fossil energy in the last century, the environment has gradually deteriorated, and the development of a green energy conversion device has become a hot topic in recent decades. Among all renewable clean energy sources, solar energy has the greatest potential. Solar energy is universal, and it can be used anywhere in the world that can be irradiated by sunlight; and the use of solar energy will not cause any secondary pollution, which makes it one of the most environmentally-friendly energy sources available today. Efficient use of solar energy can completely change the existing energy use methods, and allow our society to enter a new...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10H01G9/20
CPCB01J27/24H01G9/2022B01J35/33B01J35/61Y02E10/542
Inventor 钱兴杨家辉
Owner FUZHOU UNIV
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