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A kind of preparation method of molybdenum or tungsten disulfide and graphene composite material

A composite material and disulfide technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of low electrical conductivity, reduced catalytic activity or utilization rate of electrode materials, etc., to achieve high yield and improve hydrogen production efficiency , the effect of reducing the potential of the polarized electrode

Inactive Publication Date: 2018-11-20
ANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of molybdenum disulfide and tungsten disulfide is very low, which reduces their catalytic activity or utilization as electrode materials, and their electrocatalytic activity or utilization can be improved by compounding materials with high conductivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of two-dimensional molybdenum disulfide / graphene composites

[0015] Graphite and molybdenum disulfide with a mass ratio of 1:1 were fully mixed, and after grinding in a mortar for one hour, 5 grams of them were dry-pressed to form a disc with a diameter of 15 mm, and then heated at 800 °C under an argon atmosphere. o C sintered for 2 hours. The composite disc was used as the anode, the platinum electrode was used as the cathode, and 1 mol L -1 Concentrated ammonium sulfate aqueous solution is used as the electrolyte, and the molybdenum disulfide and graphite are electrochemically stripped at a DC constant voltage of 5.0V at room temperature. After the electrochemical stripping is completed, the black electrolyte is suction-filtered and washed with deionized water for 3 times. , and then dissolve the filtered solid powder into isopropanol solvent, sonicate for about 15 minutes, centrifuge at 3000 rpm for 5 minutes, and then re-dissolve the upper layer solut...

Embodiment 2

[0018] Graphite powder with a mass ratio of 2:1 is fully mixed with tungsten disulfide, and after being ground in a mortar for one hour, 2 grams of it are dry-pressed to form a disc with a diameter of 12mm, and then in an argon atmosphere at 1000 o C sintered for 2 hours. The composite disc was used as the anode, the graphite electrode was used as the cathode, and 2 mol L -1 Concentration of sodium sulfate aqueous solution as electrolyte, at 50 o Under the temperature of 8.0V DC constant voltage electrochemical stripping of tungsten disulfide and graphite, after the electrochemical stripping is completed, the black electrolyte is filtered, and washed with deionized water for 3 times, and then filtered out Dissolve the solid powder in isopropanol solvent, sonicate for about 15 minutes, centrifuge at 2000 rpm for 5 minutes, then centrifuge the upper layer solution at 10000 rpm for 10 minutes, pour Remove the supernatant, wash with water three times, and freeze-dry to obtain a ...

Embodiment 3

[0020] Graphite powder with a mass ratio of 1:2 was fully mixed with molybdenum disulfide, and after grinding in a mortar for one hour, 1.5 grams of it was dry-pressed to form a disc with a diameter of 12 mm, and then heated at 800 °C under an argon atmosphere. o C sintered for 2 hours. The composite disc was used as the anode, the graphite electrode was used as the cathode, and 0.5 mol L -1 Concentration of sodium sulfate aqueous solution as electrolyte, at 40 o Molybdenum disulfide was electrochemically stripped at a DC constant voltage of 4.0V at a temperature of C. After the electrochemical stripping was completed, the black electrolyte was suction-filtered, and after being washed with water for 3 times, the solid powder that was suction-filtered was again Dissolve in nitrogen nitrogen-dimethylformamide solvent, ultrasonic treatment for about 15 minutes, centrifuge at 3000 rpm for 5 minutes, and then centrifuge the upper layer solution at 10000 rpm for 10 minutes minutes...

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Abstract

Two-dimensional molybdenum disulfide or tungsten disulphide has relatively high catalysis and hydrogen evolution activity and lithium storage performance as well as high thermal stability and chemical stability; however, the molybdenum disulfide or tungsten disulphide is low in conductivity; and the molybdenum disulfide or tungsten disulphide can obtain relatively high conductivity by compounding with graphene. An electrochemical method is adopted; a molybdenum sulfide (or tungsten sulfide)-graphite composite material is used as the positive electrode; graphite or a platinum electrode is used as a negative electrode; sulfate is used as an electrolyte; and the two-dimensional molybdenum disulfide or tungsten disulphide and graphene composite material is successfully obtained through a stripping process. The composite two-dimensional electrode material has excellent electro-catalysis hydrogen evolution activity and lithium storage performance.

Description

technical field [0001] The invention relates to the field of electrocatalytic hydrogen evolution and lithium ion energy storage batteries, in particular a composite bismuth of molybdenum disulfide or tungsten disulfide and graphene prepared by an electrochemical method with high electrocatalytic hydrogen evolution activity and lithium storage performance. dimensional material. Background technique [0002] Hydrogen is a kind of clean energy. It reacts with oxygen to form water, which does not pollute the environment. It can also be used in chemical production processes such as ammonia synthesis, which can effectively reduce pollution. Electrochemical catalytic hydrogen production is currently one of the hydrogen production methods. However, precious metal materials represented by platinum-based metals are expensive and have little resource storage, which limits the development of electrocatalytic hydrogen production. Molybdenum disulfide and tungsten disulfide have good ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62
CPCH01M4/62Y02E60/10
Inventor 武卫明阎冬张长松郭尧郑勇张楠田大勇侯绍刚
Owner ANYANG INST OF TECH
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