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Layered two-dimensional material interlayer-confined metal or metal compound composite material as well as preparation method and application thereof

A metal compound, two-dimensional material technology, applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology for materials and surface science, etc. active effect

Active Publication Date: 2018-09-28
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that reducing the thickness of molybdenum disulfide can expose more molybdenum disulfide edge sites with hydrogen evolution activity, thereby greatly improving the catalytic activity of molybdenum disulfide; but for alkaline electrolytes with more industrial application prospects Hydrogen evolution reaction, molybdenum disulfide is difficult to dissociate water into hydrogen, which limits its application in alkaline electrolyte hydrogen evolution

Method used

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  • Layered two-dimensional material interlayer-confined metal or metal compound composite material as well as preparation method and application thereof
  • Layered two-dimensional material interlayer-confined metal or metal compound composite material as well as preparation method and application thereof
  • Layered two-dimensional material interlayer-confined metal or metal compound composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069]Two-dimensional molybdenum disulfide (1 g) was dispersed in n-butyllithium cyclohexane solution (2.0 M, 15 mL) for lithiation (48 h) under the protection of argon, and cyclohexane was used alternately to dilute the lithiated molybdenum sulfide product and High-speed (5000rpm) centrifugation (30min) three times respectively, and the bottom sediment was taken and dried naturally under the protection of argon. Followed by dry lithiated molybdenum disulfide: CoCl 2 ·6H 2 The ratio of O: THF is 100mg: 2.56g: 18mL, mix and seal in a hydrothermal reaction kettle, the pH of the reaction kettle system is 9.88, control the hydrothermal temperature to 80°C, and the holding time to 48 hours, and naturally cool to room temperature after the reaction , the obtained product is a composite material of two-dimensional molybdenum disulfide confined metal hydroxide (cobalt hydroxide), which is a highly efficient electrocatalyst. The schematic diagram of this two-step synthesis is shown i...

Embodiment 2

[0079] Two-dimensional molybdenum disulfide (1 g) was dispersed in n-butyllithium cyclohexane solution (2.0 M, 15 mL) for lithiation (72 h) under the protection of argon, and cyclohexane was used alternately to dilute the lithiated molybdenum sulfide product and High-speed (8000rpm) centrifugation (20min) three times respectively, and the bottom sediment was taken and dried naturally under the protection of argon. Followed by dry lithiated molybdenum disulfide: CoCl 2 ·6H 2 The ratio of O: tetrahydrofuran is 100mg: 0.256g: 18mL mixed and sealed in a hydrothermal reactor, the pH value of the reactor system is 8.5, the controlled hydrothermal temperature is 80°C, and the holding time is 24 hours. After the reaction is completed, it is naturally cooled to At room temperature, the obtained product is a composite material of two-dimensional molybdenum disulfide confined metal hydroxide (cobalt hydroxide). The schematic diagram of the two-step synthesis is as figure 1 shown.

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Embodiment 3

[0082] Two-dimensional molybdenum disulfide (0.5g) was dispersed in n-butyllithium cyclohexane solution (2.0M, 15mL) for lithiation (72h) under the protection of argon, and cyclohexane was used alternately to dilute the lithiated molybdenum sulfide product and Centrifuge at high speed (8000rpm) (20min) three times respectively, and take the bottom sediment and dry it naturally under the protection of argon. Followed by dry lithiated molybdenum disulfide:NiCl 2 ·6H 2 O: The ratio of tetrahydrofuran is 100mg: 0.274g: 18mL is mixed and sealed in a hydrothermal reactor, the pH value of the reactor system is 10, the controlled hydrothermal temperature is 80°C, and the holding time is 48 hours. After the reaction is completed, it is naturally cooled to At room temperature, the obtained product is a composite material of two-dimensional molybdenum disulfide confined metal hydroxide (nickel hydroxide), which is a highly efficient electrocatalyst. The schematic diagram of this two-st...

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Abstract

The invention discloses a layered two-dimensional material interlayer-confined metal or metal compound composite material as well as a preparation method and application thereof. The composite material comprises a layered two-dimensional material and a metal or metal compound confined among layers of the layered two-dimensional material. The method comprises the following steps: 1) performing lithiation treatment on the layered two-dimensional material to obtain a lithiated layered two-dimensional material; and 2) mixing the dried lithiated layered two-dimensional material, a metal salt and asolvent, performing sealing in a reaction kettle, and performing a hydrothermal reaction to obtain the layered two-dimensional material interlayer-confined metal or metal compound composite material.The preparation method disclosed by the invention can realize controllable preparation of a series of two-dimensional material interlayer-confined metal and metal compound composite materials; and theprepared composite material, especially a two-dimensional molybdenum disulfide interlayer-confined metal hydroxide composite material has the advantages of high electrocatalytic activity and good stability when being used as a hydrogen evolution catalyst, and has application prospects in the field of production of hydrogen by electrolysis of water.

Description

technical field [0001] The invention belongs to the field of composite material preparation and hydrogen production catalysts, and relates to a composite material of a layered two-dimensional material interlayer confinement metal or a metal compound, its preparation method and application, in particular to a two-dimensional molybdenum disulfide interlayer confinement A composite material of a domain metal hydroxide, a preparation method thereof, and an application thereof as a high-efficiency hydrogen evolution electrocatalyst for the hydrogen evolution reaction of electrolyzed water. Background technique [0002] At present, the excessive use of fossil energy by humans has led to increasingly prominent environmental and energy problems. Using electrochemical catalysis to decompose water to produce hydrogen is an effective method for renewable energy conversion, and it is also the safest and most effective technology that is expected to solve the current energy crisis. Howev...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J37/10B01J37/30B82Y30/00B82Y40/00C25B11/06C25B1/04
CPCC25B1/04B82Y30/00B82Y40/00B01J27/0515B01J37/10B01J37/30C25B11/091B01J35/33Y02E60/36
Inventor 刘碧录罗雨婷
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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