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Microwave preparation method and application of graphene/molybdenum sulfide/molybdenum oxide heterostructure catalyst

A heterogeneous structure, graphene technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the unfavorable large-scale commercial production, lithium-sulfur batteries are rarely seen, and the operation steps are cumbersome And other issues

Active Publication Date: 2021-09-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, graphene / molybdenum sulfide / molybdenum oxide composites have been gradually applied in catalytic hydrogen production due to their efficient heterostructure catalytic ability, but they are rarely seen in the field of lithium-sulfur batteries.
In addition, the traditional preparation methods of graphene / molybdenum sulfide / molybdenum oxide are mainly hydrothermal synthesis and high-temperature calcination. It runs counter to the call of the government and is not conducive to large-scale commercial production in the future

Method used

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  • Microwave preparation method and application of graphene/molybdenum sulfide/molybdenum oxide heterostructure catalyst
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  • Microwave preparation method and application of graphene/molybdenum sulfide/molybdenum oxide heterostructure catalyst

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preparation example Construction

[0045] see figure 1 A microwave preparation method of a graphene / molybdenum sulfide / molybdenum oxide heterostructure catalyst of the present invention comprises the following steps:

[0046] S1. Disperse the reduced graphene oxide powder and ammonium tetrathiomolybdate powder with a mass ratio of 1: (0.5-3) in the same volume of ethanol and deionized water respectively, and then mix, stir and sonicate the two dispersions After processing, a mixed dispersion is obtained;

[0047] Among them, the reduced graphene oxide is selected from few-layer graphene prepared by chemical method;

[0048] The ratio of reduced graphene oxide to ammonium tetrathiomolybdate is 1: (0.5~3), and different MoS can be obtained 2 -MoO 2 content of composite materials.

[0049] S2. Stir and heat the mixed dispersion liquid obtained in step S1 at 60-80°C until it is dried in a solvent to obtain a precursor powder. Take the precursor powder and perform tableting treatment to obtain a precursor tablet...

Embodiment 1

[0056] (1) Take 80mg graphene and disperse it in 10ml ethanol, weigh 80mg ammonium tetrathiomolybdate and dissolve it in 10ml deionized water, then mix, stir, and sonicate the two;

[0057] (2) Stir and heat the mixed dispersion in (1) at 70°C until the solvent is completely dried, take 30mg of powder and press it into a disc with a diameter of 10mm, and the applied pressure is 2Mpa;

[0058] (3) The disc pressed in (2) was packaged in a quartz glass bottle filled with argon, and then placed in a microwave synthesizer with the power set to 750W and the time set to 100s.

Embodiment 2

[0060] (1) Take by weighing 100mg graphene and disperse in 15ml ethanol, take by weighing 120mg ammonium tetrathiomolybdate and dissolve in 15ml deionized water, then mix, stir, ultrasonic;

[0061] (2) Stir and heat the mixed dispersion in (1) at 70°C until the solvent is completely dried, take 50mg of powder and press it into a disc with a diameter of 12mm, and the applied pressure is 2Mpa;

[0062] (3) The disc pressed in (2) was packaged in a quartz glass bottle filled with argon, and then placed in a microwave synthesizer with the power set to 800W and the time set to 120s.

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Abstract

The invention discloses a microwave preparation method and application of a graphene / molybdenum sulfide / molybdenum oxide heterostructure catalyst. The method comprises: respectively dispersing reduced graphene oxide powder and ammonium tetrathiomolybdate powder in ethanol and deionized water with the same volume to obtain corresponding dispersion liquids, mixing the two dispersion liquids, and performing stirring and ultrasonic treatment to obtain a mixed dispersion liquid; stirring, heating and drying the mixed dispersion liquid to obtain precursor powder, and then tabletting the precursor powder to obtain precursor tablets; and carrying out microwave radiation treatment on the precursor tablet, wherein the ammonium tetrathiomolybdate of the precursor tablet is decomposed and subjected to an in-situ reaction with the graphene oxygen-containing functional group to generate a molybdenum sulfide-molybdenum oxide heterostructure on the graphene sheet layer so as to obtain the graphene / molybdenum sulfide / molybdenum oxide heterostructure catalyst. Compared with a hydrothermal synthesis method or a high-temperature calcination method which is long in time consumption, high in energy consumption and high in danger, the method is simple and rapid in preparation process and high in safety coefficient.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a microwave preparation method and application of a graphene / molybdenum sulfide / molybdenum oxide heterostructure catalyst. Background technique [0002] As an environmentally friendly, low-cost, and high-energy-density second-generation lithium-sulfur battery energy storage system, lithium-sulfur batteries have attracted much attention in academia and industry. However, under the influence of factors such as polysulfide dissolution, lithium dendrite growth, and the flammability of traditional electrolytes, the current road to commercial application of lithium-sulfur batteries is relatively bumpy. In particular, the shuttle effect caused by soluble polysulfides and the slow liquid-solid conversion kinetics make the capacity of lithium-sulfur batteries decay rapidly, and the cycle life is difficult to meet the requirements of practical applications. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/34H01M4/62H01M10/052H01M50/431
CPCB01J27/051B01J37/346H01M4/628H01M10/052H01M50/431H01M2004/028Y02E60/10Y02E60/36
Inventor 韩晓刚丛智成智孙周婷赵斌
Owner XI AN JIAOTONG UNIV
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