Preparation method, catalyst and preparation method of molybdenum disulfide/carbon composite material

A technology of molybdenum disulfide and composite materials, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of limited electron transfer electrochemical kinetic performance, poor conductivity of molybdenum disulfide, and reduced activity site and other issues, to achieve the effect of cheap raw materials, low cost, and easy availability of raw materials

Inactive Publication Date: 2020-12-22
ZHENGZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two disadvantages that limit the practical application of molybdenum disulfide: (1) the interaction of van der Waals forces between molybdenum disulfide layers will inevitably lead to stacking, reducing the active sites and reducing the catalytic activity; (2) The poor electrical conductivity of MoS is due to the lateral transfer of electrons along the layered structure of MoS2 nanosheets, limiting the efficient electron transfer and the associated electrochemical kinetics

Method used

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  • Preparation method, catalyst and preparation method of molybdenum disulfide/carbon composite material
  • Preparation method, catalyst and preparation method of molybdenum disulfide/carbon composite material
  • Preparation method, catalyst and preparation method of molybdenum disulfide/carbon composite material

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preparation example Construction

[0026] In order to prepare the composite material of the sandwich structure, one of the ways that the applicant thinks of is to use a single layer of molybdenum disulfide nanosheets and graphene nanosheets to composite. However, the exfoliation and recombination of molybdenum disulfide and graphite need to consume a lot of time. , thus hampering the synthesis of sandwich-structured MoS2-graphene composites. For this reason, the inventor has redesigned its preparation method, and the preparation method of the molybdenum disulfide-graphitized carbon composite material according to another exemplary embodiment of the present invention includes carrying out water treatment on a sulfur-containing reducing agent, molybdate and ascorbic acid. Thermal synthesis reaction; roast the product of hydrothermal synthesis reaction to obtain molybdenum disulfide-graphitized carbon composite material. In an exemplary embodiment, the preparation method of the molybdenum disulfide-graphitized car...

example 1

[0038]Weigh 3mmol sodium molybdate and add it to two 50ml reaction kettles with 30ml deionized water, then add 18mmol thiourea and 6mmol ascorbic acid respectively, stir at room temperature for 30min, then put the reaction kettle into an oven at 230°C for heating After 24 hours, filter and wash to obtain molybdenum disulfide nanomaterials intercalated with organic matter, and then bake at 800°C for 2 hours to obtain molybdenum disulfide-carbon composites with a "sandwich" structure, such as figure 1 The X-ray diffraction pattern shows the generation of organic intercalation molybdenum disulfide and molybdenum disulfide-graphitized carbon composites, and the (002) plane is 0.98nm due to the interlayer spacing of graphitized carbon.

example 2

[0040] Weigh 3mmol of sodium molybdate and add it to a 50ml reactor with 30ml of deionized water, then add 18mmol of thiourea and 25mmol of ascorbic acid, stir at room temperature for 30min, then put the reactor into a 210°C oven and heat for 40 hours. Molybdenum disulfide nanomaterials including organic matter intercalation are obtained by filtering and washing, and then calcined at 700° C. for 3 hours to obtain molybdenum disulfide-carbon composite materials. Such as figure 2 The characteristic peaks of the (002) plane and (004) plane shown in the X-ray diffraction diagram of the graph prove that the interlayer spacing of the molybdenum disulfide-graphitized nanocarbon composite is 0.98nm.

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Abstract

The invention provides a preparation method for molybdenum disulfide / graphitized carbon composite material, a catalyst and a preparation method thereof. The preparation method for molybdenum disulfide / graphitized carbon composite material comprises the following steps: performing a hydrothermal synthesis reaction on a sulfur-containing reducing agent, molybdate and ascorbic acid; sintering a product of the hydrothermal synthesis reaction to obtain the molybdenum disulfide / graphitized carbon composite material. The catalyst is prepared from the molybdenum disulfide / graphitized carbon compositematerial, the molybdenum disulfide / graphitized carbon composite material is prepared from molybdenum disulfide being of a layer structure and graphitized carbon inserted into adjacent layers of the layer structure. According to the preparation method for the catalyst applied to electrochemical hydrogen evolution, the prepared molybdenum disulfide / carbon composite material, is taken as the catalyst. The preparation method has the advantages of readily-available raw material, simple synthesis process, capability of preparing the molybdenum disulfide / carbon composite material which has high conductivity and catalytic property.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a molybdenum disulfide-graphitized carbon composite material suitable for use as an electrochemical hydrogen evolution cathode catalyst and a preparation method thereof. Background technique [0002] With the excessive dependence on fossil energy, the limitations of the energy structure have become increasingly prominent, and problems such as energy crisis and environmental pollution have become increasingly serious. Hydrogen energy is one of the most promising energy technologies at present, which can meet a large amount of energy demand and alleviate environmental pollution due to the consumption of fossil fuels (eg, natural gas, coal, and oil). Electrochemical hydrogen evolution reaction (HER), 2H + +2e - →H 2 , will be one of the methods for efficient and sustainable hydrogen production. A key challenge in producing hydrogen using electrochemical catalytic te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051C25B1/04C25B11/06
CPCB01J27/051C25B1/04C25B11/04Y02E60/36
Inventor 马炜李焕冉韩一帆
Owner ZHENGZHOU UNIV
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