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Sulfur-doped molybdenum selenide/graphene-graphene nanoribbon airgel and its preparation

A graphene nanoribbon, graphene technology, applied in electrical components, electrochemical generators, structural parts, etc., can solve the problems of insufficient exposure of electrochemical active sites, affecting catalytic properties and energy storage cycle stability. , to achieve the effect of enhancing electron transport kinetics, improving electrochemical reaction, and curbing self-aggregation

Inactive Publication Date: 2018-10-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure molybdenum selenide is easy to agglomerate, and the electrochemical active sites cannot be fully exposed, which seriously affects its catalytic properties and cycle stability of energy storage.

Method used

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  • Sulfur-doped molybdenum selenide/graphene-graphene nanoribbon airgel and its preparation

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Experimental program
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Effect test

Embodiment 1

[0040] A preparation method of sulfur-doped molybdenum selenide / graphene-graphene nanoribbon airgel, the specific steps are:

[0041] (1) disperse 200mg graphene oxide in 100ml deionized water, obtain the graphene oxide dispersion liquid that the concentration of stable dispersion is 2mg / ml by ultrasonic;

[0042] (2) The graphene oxide nanoribbon aqueous dispersion liquid that the concentration of 3ml is 2mg / ml is dripped in the graphene oxide liquid of 3ml, stirs for a period of time, forms the mixed dispersion of uniform graphene oxide and graphene oxide nanoribbon liquid;

[0043] (3) Freeze the mixed dispersion of graphene oxide and graphene oxide nanobelts into a solid in liquid nitrogen, then freeze-dry in a freeze dryer (the temperature of the freeze dryer is between -30 and -55°C) for 48h , and then calcined and reduced at a temperature of 900°C for 2 hours to obtain a graphene-graphene nanoribbon hybrid aerogel;

[0044] (4) Dissolve 20mg of selenium powder in 10ml...

Embodiment 2

[0049] Change the volume of the graphene oxide nanoribbon in Example 1 to 4ml, and the volume of graphene oxide to 2ml, and the rest are the same as in Example 1. The composite material finally obtained is denoted as S-MoSe 2 @GGNR-2.

Embodiment 3

[0051] Change the quality of the selenium powder in Example 1 to 40mg, and the rest are the same as in Example 1. The composite material finally obtained is denoted as S-MoSe 2 @GGNR-3.

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Abstract

The invention provides a preparation method of sulfur-doped molybdenum selenide / graphene-graphene nanoribbon aerogel. The method is characterized by comprising the following steps of (1) carrying out freeze drying and burning on a mixed dispersion liquid of a graphene oxide and a graphene oxide nanoribbon to obtain graphene-graphene nanoribbon hybrid aerogel; (2) dispersing selenium powder into hydrazine hydrate, mixing the obtained selenium powder dispersion liquid with a sodium molybdate water solution to obtain a mixed liquid, immersing the graphene-graphene nanoribbon hybrid aerogel obtained in the step 1 into the mixed liquid, adding an N,N-dimethyl formamide solvent and obtaining a molybdenum selenide / graphene-graphene nanoribbon aerogel composite material through solvothermal reaction; and (3) burning the molybdenum selenide / graphene-graphene nanoribbon aerogel composite material obtained in the step (2) and powdered sulfur to obtain the sulfur-doped molybdenum selenide / graphene-graphene nanoribbon aerogel. The prepared sulfur-doped molybdenum selenide / graphene-graphene nanoribbon aerogel composite material has the advantages of being stable in structure, large in specific surface area, good in electrical conductivity, adjustable in aperture and the like.

Description

technical field [0001] The invention belongs to the technical field of transition metal chalcogenide-carbon nanomaterials, and in particular relates to a sulfur-doped molybdenum selenide / graphene-graphene nanoribbon airgel composite material and a preparation method thereof. Background technique [0002] Graphene is made of sp 2 Monolithic graphite with carbon atoms arranged hexagonally has a high internal carrier mobility (200000cm 2 V -1 the s -1 ), high light transmittance (~97.7%), good thermal conductivity (~5000Wm -1 K -1 ) and theoretical specific surface area (2630m 2 g -1 ) and excellent mechanical strength. Graphene nanoribbon is a ribbon-shaped graphene. As a quasi-one-dimensional carbon-based nanomaterial, it also inherits the outstanding physical and chemical properties of graphene. In addition, the large aspect ratio and special edge effect of graphene nanoribbons make its properties more flexible and adjustable. Therefore, these special properties mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525H01G11/50
CPCH01G11/50H01M4/364H01M10/0525Y02E60/10
Inventor 刘天西孙振樊玮左立增顾华昊张由芳
Owner DONGHUA UNIV
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