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

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

Active Publication Date: 2020-08-11
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 an adjustable egg yolk-shell structure nitrogen-carbon doped cobalt-molybdenum sulfide counter electrode catalyst
  • Preparation method of an adjustable egg yolk-shell structure nitrogen-carbon doped cobalt-molybdenum sulfide counter electrode catalyst
  • Preparation method of an adjustable egg yolk-shell structure nitrogen-carbon doped cobalt-molybdenum sulfide counter electrode catalyst

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 complete dissolution, mix the two solutions evenly, stir for 10 min, let stand for 24 h, and centrifuge 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 water, and place in an oil bath at 50 °C for 0.5 h to obtain ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution, stir at room temperature for 0.5 h, centrifuge, wash and dry to obtain the intermediate ZIF-67 of ZIF-67 coated with cobalt and molybdenum sulfide @Co-MoS 2 . Then 100 mg ZIF-67@Co-MoS 2 After the intermediate was ground and mixed with 200 mg sulfur powder, it was placed in a porcelain boat, heated to 300 °C in a tube furnace, kept for 1.5 h, and the heating rate was 1.5 °C / min. Heterocobalt mol...

Embodiment 2

[0034] Dissolve 4.64 g of cobalt nitrate hexahydrate in 464 mL of methanol, and 5.24 g of 2-methylimidazole in 524 mL of methanol. After complete dissolution, mix the two solutions evenly, stir for 10 min, let stand for 24 h, and centrifuge to dry The purple ZIF-67 polyhedron was obtained. 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 water, and place in an oil bath at 60 °C for 0.5 h to obtain ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution, stir at room temperature for 0.5 h, centrifuge, wash and dry to obtain the intermediate ZIF-67 of ZIF-67 coated with cobalt and molybdenum sulfide @Co-MoS 2 . Then 100 mg of the above ZIF-67@Co-MoS 2 After the intermediate was ground and mixed with 200 mg sulfur powder, it was placed in a porcelain boat, heated to 350 °C in a tube furnace, kept for 2 h, and the heating...

Embodiment 3

[0036] Dissolve 4.64 g of cobalt nitrate hexahydrate in 464 mL of methanol, and 5.24 g of 2-methylimidazole in 524 mL of methanol. After complete dissolution, mix the two solutions evenly, stir for 10 min, let stand for 24 h, and centrifuge to dry The purple ZIF-67 polyhedron was obtained. 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 water, and place in an oil bath at 60 °C for 0.5 h to obtain ammonium thiomolybdate solution. Disperse 300 mg of ZIF-67 polyhedron in 100 mL of absolute ethanol, mix with ammonium thiomolybdate solution, stir at room temperature for 1 h, centrifuge, wash and dry to obtain the intermediate ZIF-67 of ZIF-67 coated with cobalt and molybdenum sulfide @Co-MoS 2 . Then 100 mg of the above ZIF-67@Co-MoS 2 After the intermediate was ground and mixed with 200 mg of sulfur powder, it was placed in a porcelain boat, heated to 400 °C in a tube furnace, kept for 2 h, and the hea...

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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, in particular to a nitrogen-carbon-doped cobalt-molybdenum sulfide catalyst NC-CoS with an adjustable egg yolk-shell structure 2 @Co-MoS 2 method of preparation. Background technique [0002] Based on the over-exploitation and over-consumption of fossil energy in the last century and the gradual deterioration of the environment, 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 utilization potential. Solar energy is universal, and it can be used in any place in the world that can be exposed to sunlight; and the use of solar energy will not cause any secondary pollution, which also makes it one of the most environmentally friendly available energy sources today. Efficient use of solar energy can completely change the existing way of energy utilization, allowing our society to e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10H01G9/20
CPCB01J27/24B01J35/0033B01J35/1004H01G9/2022Y02E10/542
Inventor 钱兴杨家辉
Owner FUZHOU UNIV
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