Three-dimensional molybdenum disulfide nanoflower-graphene composite material and application thereof

A molybdenum disulfide, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of improving catalytic activity, reducing electrical resistance, and improving electron conduction and transportation.

Active Publication Date: 2015-08-26
远科秦皇岛节能环保科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the synthesis of MoS2 nanosheets with a three-dimensional nanoflower structure perpendicular to graphene with a lattice spacing of 0.85 nm expanded to 0.85 nm via a one-step hydrothermal method has not been reported.

Method used

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  • Three-dimensional molybdenum disulfide nanoflower-graphene composite material and application thereof
  • Three-dimensional molybdenum disulfide nanoflower-graphene composite material and application thereof
  • Three-dimensional molybdenum disulfide nanoflower-graphene composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: This example prepares a three-dimensional molybdenum disulfide nanoflower-graphene composite material, which specifically includes the following steps:

[0020] (1) Add 10 mg of prepared graphene oxide powder (GO) into a reagent bottle containing 10 mL of N,N dimethylformamide, and ultrasonicate for half an hour to uniformly disperse graphene in N,N dimethylformamide formamide (DMF) to obtain a graphene oxide suspension:

[0021] (2) Weigh 20 mg of ammonium thiomolybdate with an electronic balance, and add it to the graphene oxide suspension in step 1. Sonicate for 10 minutes to dissolve;

[0022] (3) Add the solution in step 2 into a 25mL tetrafluoroethylene reactor, and react at 190°C for 15h;

[0023] (4) Add ethanol to the black product obtained from the reaction in step 3, centrifuge and wash it, repeat 5 times for 8 minutes each time, and dry it in vacuum at 60°C for 24 hours to obtain a three-dimensional molybdenum disulfide nanoflower-graphene compo...

Embodiment 2

[0025] Example 2, this example uses the three-dimensional molybdenum disulfide nanoflower-graphene composite material prepared in Example 1 to prepare a glassy carbon electrode, specifically: adding 3 mg of the dried three-dimensional molybdenum disulfide nanoflower-graphene composite material to Add 1.5mL of deionized water-ethanol mixture with a volume ratio of (3:1), and add 120uL of 5wt% Nafion solution, and obtain a suspension after ultrasonication for half an hour. Then use a pipette gun to measure 5uL of the suspension and drop-coat it on the glassy carbon electrode, and dry it naturally to obtain a molybdenum disulfide-graphene modified glassy carbon electrode.

Embodiment 3

[0026] Embodiment 3: The electrode prepared in embodiment 2 is applied to electrochemical hydrogen evolution, specifically:

[0027] Three-dimensional molybdenum disulfide nanoflower-graphene composite modified glassy carbon electrode (GCE) as working electrode (WE), saturated calomel electrode as reference electrode (RE), platinum wire as counter electrode (CE) to form three electrodes system, with 0.5M sulfuric acid as the electrolyte. Before performing the electrochemical test, a saturated nitrogen gas was passed through to remove the oxygen in the solution. And calibrate the electrode positive SCE=RHE+0.267V. image 3 For the polarization curves (Polarization curves) of the three-dimensional molybdenum disulfide nanoflower-graphene composite prepared for the present invention, it can be seen from the figure that when the overpotential is 250mV, the current density reaches 43mA / cm 2 , converted into a mass current density of 304A / g. Figure 4 The stability test curve (Du...

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Abstract

The invention discloses a preparation method for a three-dimensional molybdenum disulfide nanoflower-graphene composite material and application of the three-dimensional molybdenum disulfide nanoflower-graphene composite material as an electrochemical hydrogen evolution catalyst. According to the invention, the three-dimensional molybdenum disulfide nanoflower-graphene composite material is prepared through a one-step hydrothermal method; and the obtained composite material is used to modify a glassy carbon electrode after ultrasonic dispersion so as to obtain a three-dimensional molybdenum disulfide nanoflower-graphene composite material modified electrode. The three-dimensional molybdenum disulfide nanoflower-graphene composite material is mainly applied to electrochemical hydrogen evolution; and a linear scanning curve (polarization curve) is used to detect the catalytic activity of the synthesized molybdenum disulfide nanoflower-graphene composite material, and a cyclic voltammetry curve is employed for testing the stability of the molybdenum disulfide nanoflower-graphene composite material. According to the invention, synergism of molybdenum disulfide nanoflower and graphene in the three-dimensional molybdenum disulfide nanoflower-graphene composite material is made full use of to improve the catalytic efficiency of electrochemical hydrogen evolution and to effectively enhance the stability of the catalyst so as to allow the catalyst to be used in an acidic environment for a long time.

Description

technical field [0001] The invention belongs to the field of preparation and application of clean and sustainable new energy sources, and in particular relates to a three-dimensional molybdenum disulfide nanoflower-graphene composite material and its application. Background technique [0002] With the rapid development of the world economy, the excessive consumption of traditional energy such as oil and natural gas and the environmental problems caused by the use of traditional energy restrict the rapid and effective further development of today's society. Therefore, finding an inexhaustible green and clean energy to replace traditional energy has become the top priority to solve the energy crisis. As a renewable resource, hydrogen has the characteristics of green and pollution-free, so it can be used as an ideal new green energy to replace traditional non-renewable resources. Traditional electrochemical hydrogen evolution catalysts include platinum-based noble metal cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B82Y30/00B82Y40/00
Inventor 刘爱萍章君马赵丽
Owner 远科秦皇岛节能环保科技开发有限公司
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