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Molybdenum selenide/graphene/carbon nanotube composite material and preparation method thereof

A technology for acidifying carbon nanotubes and carbon nanotubes, applied in electrodes, electrical components, electrolysis processes, etc., can solve the problems affecting catalytic properties and energy storage cycle stability, electrochemical active sites cannot be fully exposed, molybdenum selenide problems such as ease of use, to achieve the effect of effective and fast preparation method, ingenious experimental design, and simple preparation process

Inactive Publication Date: 2016-10-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum selenide is widely used in the fields of electrochemical hydrogen evolution and lithium-ion batteries, but pure molybdenum selenide is easy to agglomerate, so that its electrochemical active sites cannot be fully exposed, which seriously affects its catalytic properties and energy storage. cycle stability

Method used

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  • Molybdenum selenide/graphene/carbon nanotube composite material and preparation method thereof
  • Molybdenum selenide/graphene/carbon nanotube composite material and preparation method thereof
  • Molybdenum selenide/graphene/carbon nanotube composite material and preparation method thereof

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Experimental program
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Embodiment 1

[0037] Embodiment 1, the present embodiment comprises the following steps:

[0038] (1) Ultrasonic dispersion of graphite oxide and acidified carbon nanotubes in water to obtain a concentration of 8mg mL respectively -1 and 4mg mL -1 For the dispersion liquid, mix its water dispersion liquid at a volume ratio of 1:1, and stir to make it evenly mixed;

[0039](2) Quenching the obtained graphene oxide / carbon nanotube mixed dispersion with liquid nitrogen and freeze-drying to obtain graphene oxide / acidified carbon nanotube aerogel;

[0040] (3) The graphene oxide / acidified carbon nanotube airgel was carbonized at high temperature in high-purity nitrogen, the high-temperature carbonization temperature was 800 °C, and the high-temperature carbonization time was 2 h, and the graphene / carbon nanotube airgel was prepared;

[0041] (4) Dissolve 15 mg of selenium powder in 5 mL of hydrazine hydrate, heat and stir for a period of time to disperse it evenly;

[0042] (5) Add 23.0 mg so...

Embodiment 2

[0045] Embodiment 2, change the quality of the selenium powder in embodiment 1 into 30 mg, the quality of sodium molybdate becomes 46.0 mg, all the other are the same as embodiment 1, the composite material finally obtained is denoted as MoSe 2 -GCA-2.

Embodiment 3

[0046] Embodiment 3, the quality of the selenium powder in embodiment 1 is changed into 45 mg, the quality of sodium molybdate becomes 69.0 mg, all the other are the same as embodiment 1, the composite material finally obtained is denoted as MoSe 2 -GCA-3.

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Abstract

The invention belongs to the technical field of transition metal chalcogenide-carbon materials, and particularly discloses a molybdenum selenide / graphene / carbon nanotube composite material and a preparation method thereof. The method comprises the preparation processes of: quenching a graphene oxide-acidified carbon nanotube aqueous dispersion by liquid nitrogen and carrying out freeze drying to prepare graphene oxide / acidified carbon nanotube aerogel; preparing graphene / carbon nanotube aerogel through a high-temperature carbonization method; and then carrying out in-situ growth of a vertically oriented molybdenum selenide nanosheet on the graphene / carbon nanotube aerogel through a one-step solvothermal method. The prepared graphene / carbon nanotube aerogel has the advantages of stable chemical property, high specific surface area, good conductivity, excellent mechanical property and the like; the molybdenum selenide nanosheet evenly grows on the graphene / carbon nanotube aerogel; a unique three-dimensional porous structure and high specific surface area of the graphene / carbon nanotube aerogel are fully utilized; and the composite material disclosed by the invention can be taken as an ideal high-performance electrocatalytic material and an electrode material for new energy devices of a lithium-ion battery, a solar battery and the like.

Description

technical field [0001] The invention belongs to the technical field of transition metal chalcogenide-carbon materials, and in particular relates to a molybdenum selenide / graphene / carbon nanotube composite material and a preparation method thereof. Background technique [0002] Graphene / carbon nanotube airgel has excellent physical and chemical properties, such as high electrical conductivity, excellent mechanical properties, high specific surface area and good chemical stability, etc. It can be used in catalyst supports, polymer nanocomposites, It is widely used in the fields of flexible substrate materials for energy conversion and storage devices. Quenching with liquid nitrogen and freeze-drying is a simple and effective technique to prepare graphene-like aerogels. Through the rapid crystallization of ice crystals at ultra-low temperatures and subsequent sublimation, graphene oxide will be induced by van der Waals forces to self-assemble into coils. - A three-dimensional ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583C01B31/02C25B11/06H01L31/0224
CPCC25B11/04H01L31/0224H01M4/362H01M4/5815H01M4/583Y02E60/10
Inventor 刘天西郜伟施贻琴樊玮鲁恒毅左立增黄云鹏
Owner FUDAN UNIV
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