A kind of 3D porous graphene/transition metal oxide composite material and its preparation method and application

A technology of porous graphene and transition metals, which is applied in the manufacture of hybrid/electric double layer capacitors, electrochemical generators, hybrid capacitor electrodes, etc., can solve the problems of increasing costs and increasing the experimental process, so as to improve electrolysis and reduce agglomeration , the effect of rich pore structure

Active Publication Date: 2021-02-12
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Citing the two at the same time will increase the experimental process and increase costs, and introduce impurities

Method used

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  • A kind of 3D porous graphene/transition metal oxide composite material and its preparation method and application
  • A kind of 3D porous graphene/transition metal oxide composite material and its preparation method and application
  • A kind of 3D porous graphene/transition metal oxide composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of graphite oxide: Mix 180mL of concentrated sulfuric acid and 20mL of phosphoric acid in a beaker, then pour 1.5g of graphite powder into the beaker, stir magnetically for 1 hour, then weigh 9gKMnO 4 , slowly poured into a beaker, and continued magnetic stirring for 24 hours to obtain a purple-red liquid. Prepare 300mL of frozen deionized water, pour the obtained purple-red liquid into the frozen deionized water, add 15mL of H after a while 2 o 2 , the solution turns into a brighter yellow color at this time, after being fully reacted, it is centrifuged and washed to obtain graphite oxide.

[0044] Take 0.2g of graphite oxide, disperse it in 50mL of deionized water, and ultrasonicate for 2 hours to obtain solution A, during which the water temperature is controlled at 15°C. Weigh 0.04g of cobalt chloride and add to solution A and stir for 30 minutes to obtain solution B, then weigh 0.6g of sodium bicarbonate and add to solution B to obtain solution C. Po...

Embodiment 2

[0052] The preparation method of graphite oxide is with example 1. Take 0.2g of graphite oxide, disperse it in 50mL of deionized water, and ultrasonicate for 2 hours to obtain solution A, during which the water temperature is controlled at 20°C. Weigh 0.6g of sodium bicarbonate and dissolve it in solution A and stir to obtain solution B. Pour solution B into a 100mL polytetrafluoroethylene reactor and react at 110°C for 10 hours.

[0053] The product was first washed with deionized water and ethanol by centrifugation, and then dried to obtain 3D porous graphene.

[0054] SEM image of the prepared 3D porous graphene Figure 5 shown by Figure 5 A porous structure can be observed. It shows that it is feasible to use sodium bicarbonate as a pore-forming agent for the preparation of porous graphene by hydrothermal method.

Embodiment 3

[0056] The preparation method of graphite oxide is with example 1. Take 0.2g of graphite oxide, disperse it in 50mL of deionized water, and ultrasonicate for 2 hours to obtain solution A, during which the water temperature is controlled at 15°C. Weigh 0.04g of cobalt chloride and dissolve in solution A and stir to obtain solution B, then weigh 0.16g of urea and add to solution B to obtain solution C. Pour solution C into a 100mL polytetrafluoroethylene reactor, and react at 110°C for 10 hours.

[0057] The product was first washed with deionized water and ethanol by centrifugation, and then dried to obtain a 3D graphene / cobalt hydroxide composite material. The 3D graphene / cobalt hydroxide composite material was calcined at a constant temperature of 350°C for 4 hours in a tube furnace to obtain a 3D graphene / cobalt trioxide composite material.

[0058] The SEM image of the prepared graphene / cobalt tetroxide composite Figure 6 shown by Figure 6 It was found that when urea ...

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Abstract

The invention discloses a 3D porous graphene / transition metal oxide composite material and its preparation method and application. The preparation method of the composite material: after ultrasonically dispersing graphite oxide into water, then adding transition metal salt and sodium bicarbonate and stirring dissolved to obtain a mixed solution; the mixed solution is transferred into a hydrothermal reaction kettle for hydrothermal reaction, and the hydrothermal reaction product is dried and calcined under a protective atmosphere to obtain a 3D porous structure, and the original transition metal oxide 3D porous graphene / transition metal oxide composite material grown on the surface of graphene, the composite material has good electrochemical properties, can be applied to supercapacitor electrode materials or lithium ion negative electrode materials, and its preparation method is simple and cheap , Environmentally friendly and meet industrial production standards.

Description

technical field [0001] The invention relates to an energy storage device material, in particular to a 3D porous graphene / transition metal oxide composite material, a preparation method thereof, and an application as an electrode material for a supercapacitor or a lithium ion battery, belonging to the technical field of energy storage device preparation. Background technique [0002] Supercapacitors combine the physical characteristics of ordinary capacitors, and have the advantages of high power density, long cycle life and fast charge and discharge, so they have attracted much attention in the field of energy storage. Lithium-ion batteries have the advantages of high specific energy, high working voltage, and no memory effect. Especially when energy issues become mainstream hot spots in society today, supercapacitors and lithium-ion batteries play an important role in supporting new energy Another piece of sky in the field. [0003] There are two energy storage mechanisms ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/46H01G11/86H01M4/36H01M4/48H01M4/583H01M10/0525
CPCH01G11/24H01G11/32H01G11/46H01G11/86H01M4/362H01M4/48H01M4/583H01M10/0525Y02E60/10Y02E60/13
Inventor 汪形艳蔡治邦金显明阎晓静戴友芝刘林
Owner XIANGTAN UNIV
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