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Electrochemical preparation method for two-dimensional molybdenum disulfide and tungsten disulfide nanosheet

A molybdenum disulfide and tungsten disulfide technology is applied in the fields of electrocatalytic hydrogen evolution and lithium ion energy storage batteries, which can solve the problems of low resource storage, high price of precious metal materials, restricting the development of electrocatalytic hydrogen production, etc., and achieve high yield Effect

Inactive Publication Date: 2016-11-09
ANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydrogen reacts with oxygen to generate water, which does not pollute the environment. It is a clean energy source and can also be used in chemical production processes such as ammonia synthesis, which can effectively reduce pollution. Electrochemical catalytic hydrogen production is currently a hydrogen production method. The main method, but precious metal materials represented by platinum-based metals are expensive, and the resource storage is very small, which limits the development of electrocatalytic hydrogen production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of two-dimensional molybdenum disulfide materials

[0017] Mix metal silver powder and molybdenum disulfide with a mass ratio of 1:1, grind in a mortar for one hour, take 5 grams of them to form a disc with a diameter of 15 mm, and then dry it 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 is electrochemically stripped at room temperature with a DC constant voltage of 5.0V. After the electrochemical stripping is completed, the black electrolyte is filtered and treated with 20% concentrated nitric acid for 3 times. , remove the Ag particles therein, wash with water for 3 times, dissolve the solid powder filtered out by suction again into isopropanol solvent, treat it ultrasonically for about 15 minutes, and centrifuge for 5 minutes at a ...

Embodiment 2

[0020] Mix metal copper powder with a mass ratio of 2:1 and tungsten disulfide thoroughly, grind it in a mortar for one hour, take 2 grams of it to form a disc with a diameter of 12mm, and then dry it under 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 C, the tungsten disulfide was electrochemically stripped at a DC constant voltage of 8.0V. After the electrochemical stripping was completed, the black electrolyte was filtered and treated with 10% nitric acid for 3 times to remove the Cu particles. After washing with water for 3 times, the solid powder filtered out by suction was dissolved in isopropanol solvent again, ultrasonically treated for about 15 minutes, centrifuged at 2000 rpm for 5 minutes, and then the upper layer solution was again heated at 10000 Centrifu...

Embodiment 3

[0022] Fully mix metal copper powder and molybdenum disulfide with a mass ratio of 1:2, grind in a mortar for one hour, take 1.5 grams of it to form a disc with a diameter of 12 mm, and then dry it 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 filtered and treated with 8% nitric acid for 3 times to remove the Cu particles. After washing with water for 3 times, the solid powder filtered out by suction was dissolved in nitrogen nitrogen-dimethylformamide solvent again, ultrasonically treated for about 15 minutes, centrifuged at 3000 rpm for 5 minutes, and then again The solution in the upper layer was ...

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PUM

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Abstract

Molybdenum disulfide or tungsten disulfide is good in catalytic hydrogen evolution activity, lithium storage performance, thermal stability and chemical stability. In order to increase the utilization rate of the molybdenum disulfide or the tungsten disulfide and improve the catalytic hydrogen evolution catalytic activity and the lithium storage specific capacity, sulfide needs to be prepared into a monomolecular layer or polymolecular layer two-dimensional material. An electrochemical method is adopted, a molybdenum disulfide (or tungsten disulfide)-metal composite material serves as an anode, graphite or a platinum electrode serves as a cathode, sulfate serves as an electrolyte, and thus two-dimensional molybdenum disulfide or tungsten disulfide with the thickness being 1-20 nm is successfully stripped out. By means of the two-dimensional sulfide, the electrocatalytic hydrogen evolution activity is good, and the lithium storage performance is excellent.

Description

technical field [0001] The invention relates to the field of electrocatalytic hydrogen evolution and lithium ion energy storage batteries, in particular to a molybdenum disulfide or tungsten disulfide two-dimensional material prepared by an electrochemical method with high electrocatalytic hydrogen evolution activity and lithium storage performance. Background technique [0002] Hydrogen reacts with oxygen to generate water, which does not pollute the environment. It is a clean energy source and can also be used in chemical production processes such as ammonia synthesis, which can effectively reduce pollution. Electrochemical catalytic hydrogen production is currently a hydrogen production method. 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 electrocatalytic hydrogen evolution act...

Claims

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Application Information

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IPC IPC(8): C25B1/00B82Y40/00
CPCB82Y40/00C25B1/00
Inventor 武卫明张长松郑勇阎冬田大勇殷美丽侯绍刚
Owner ANYANG INST OF TECH
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