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Molybdenum disulfide/carbon composite hydrogen evolution electro-catalyst and preparation method thereof

A technology of molybdenum disulfide and carbon composite materials, which is applied in the field of electrocatalytic hydrogen evolution, can solve the problems of reducing the number of active sites and electrocatalytic activity, limiting charge transfer and kinetics, and poor conductivity of molybdenum disulfide, achieving uniform size, The effect of regular shape and low cost

Pending Publication Date: 2018-08-24
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two problems to be solved when molybdenum disulfide is used in the field of electrocatalysis: on the one hand, due to the existence of van der Waals force, the serious aggregation between the layers leads to a great reduction in the number of active sites and the electrocatalytic activity.
On the other hand, the semiconductor molybdenum disulfide is poorly conductive, thus limiting the charge transfer and kinetics during the reaction

Method used

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  • Molybdenum disulfide/carbon composite hydrogen evolution electro-catalyst and preparation method thereof
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  • Molybdenum disulfide/carbon composite hydrogen evolution electro-catalyst and preparation method thereof

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Embodiment 1

[0024] (1) Preparation of carbon: Dissolve 0.40 g of zinc acetate and 50 g of dimethylimidazole in 200 mL of deionized water respectively, mix the above two solutions and stir at room temperature for 1 h, separate the solid, and obtain the metal organic framework material ZIF -8. Gained ZIF-8 powder was loaded into a porcelain boat, and then transferred to a temperature-programmed tube furnace. Under the protection of argon, the o C / min heat up to 750 o C and keep warm for 3 h. After naturally cooling to room temperature, a black powder was obtained, which was washed with 35% HCl, deionized water, and dried to obtain a carbon material.

[0025] (2) Preparation of molybdenum disulfide / carbon composites by hydrothermal method: Dissolve 150 mg sodium molybdate tetrahydrate and 310 mg thiourea in 25 mL deionized water, pour the solution into a 50 mL reaction kettle, and then add 10 mg of carbon prepared in step (1), mix well, and seal. at 180 o C hydrothermal reaction for 48 ...

Embodiment 2

[0027] (1) Carbon preparation: 1.20 g of zinc sulfate and 16 g of dimethylimidazole were dissolved in 200 mL of deionized water, respectively, and the above two solutions were mixed and stirred at room temperature for 1 h to prepare the metal organic framework material ZIF-8. Gained ZIF-8 powder was loaded into a porcelain boat, and then transferred to a temperature-programmed tube furnace. Under the protection of argon, the o C / min heating up to 850 o C and keep warm for 0.5 h. After naturally cooling to room temperature, a black powder was obtained, which was washed with 35% HCl, deionized water, and dried to obtain a carbon material.

[0028] (2) Preparation of molybdenum disulfide / carbon composites by hydrothermal method: Dissolve 150 mg sodium molybdate tetrahydrate and 310 mg thiourea in 25 mL deionized water, pour the solution into a 50 mL reaction kettle, and then add 25 mg of carbon prepared in step (1), mix well, and seal. at 200 o C hydrothermal reaction for 24 ...

Embodiment 3

[0030] (1) Carbon preparation: 0.72 g of zinc nitrate and 30 g of dimethylimidazole were dissolved in 200 mL of deionized water, respectively, and the above two solutions were mixed and stirred at room temperature for 1 h to prepare the metal organic framework material ZIF-8. Gained ZIF-8 powder was loaded into a porcelain boat, and then transferred to a temperature-programmed tube furnace. Under the protection of argon, the o C / min heating up to 800 o C and keep warm for 1 h. After naturally cooling to room temperature, a black powder was obtained, which was washed with 35% HCl, deionized water, and dried to obtain a carbon material.

[0031] (2) Preparation of molybdenum disulfide / carbon composites by hydrothermal method: Dissolve 150 mg sodium molybdate tetrahydrate and 310 mg thiourea in 25 mL deionized water, pour the solution into a 50 mL reaction kettle, and then add 50 mg of carbon prepared in step (1), mix well, and seal. at 200 o C hydrothermal reaction for 24 h,...

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Abstract

The invention discloses a molybdenum disulfide / carbon composite hydrogen evolution electro-catalyst and a preparation method thereof, and belongs to the field of electro-catalysis hydrogen evolution.The preparation method comprises the following specific steps that (1) carbon is prepared, specifically, deionized water serves as solvent, a mixed solution of zinc salt and dimethylimidazole is prepared, a metal organic framework material ZIF-8 is prepared, and a carbon material is prepared after high-temperature calcination; and (2) a molybdenum disulfide / carbon composite material is prepared through a hydrothermal method, specifically, deionized water serves as solvent, a mixed solution of sodium molybdate tetrahydrate and thiourea is prepared, the carbon material and the mixed solution ofsodium molybdate tetrahydrate and thiourea are put into a reaction kettle to be subjected to a hydrothermal reaction, and the molybdenum disulfide / carbon composite material is obtained. When the prepared material is used for an electro-catalysis hydrogen evolution reaction, the high catalytic activity and stability are shown, the preparation method is easy to operate, the cost is low, repeatability is high, and the application prospects are broad.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic hydrogen evolution, and in particular relates to a molybdenum disulfide / carbon composite material and a preparation method thereof. Background technique [0002] With the increasing global energy crisis and environmental pollution, electrolysis of water to produce hydrogen is one of the effective ways to replace traditional fossil fuels. Platinum group metals are commonly used electrocatalytic materials for the hydrogen evolution reaction, but their high cost and extremely low reserves greatly limit their wide application. In view of this, non-platinum electrocatalysts such as transition metal dichalcogenides, cobalt compounds, and macrocyclic compounds have been used to electrocatalyze the hydrogen evolution reaction. These materials not only exhibit catalytic activity close to that of platinum metal, but also have abundant reserves, but they are still far from practical application. I...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/12C25B1/04
CPCC25B1/04C25B11/075C25B11/043Y02E60/36
Inventor 周虎冯建慧袁爱华
Owner JIANGSU UNIV OF SCI & TECH
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