Silicon dioxide@metal oxide/graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof

A graphene aerogel, silica technology, applied in the direction of hybrid capacitor electrodes, etc., can solve problems such as volume expansion loss, and achieve the effects of inhibiting volume expansion, simple operation, and environmental friendliness

Active Publication Date: 2018-09-28
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the metal oxide / graphene composite material prepared in the prior art as an electrode material, the metal oxide is prone to volume expansion loss, specific capacitance and other defects. The purpose of the present invention is to provide a metal oxide coated with silicon dioxide. SiO composed of oxide particles supported in the pore structure of graphene airgel 2 @ MOx / GA composite material, the composite material achieves double-layer coating of metal oxide by silicon dioxide and graphene airgel, which greatly improves the stability of the material and can effectively prevent metal oxidation during use as a capacitor Volume expansion occurs during charging and discharging, which improves the specific capacitance and cycle stability of the capacitor

Method used

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  • Silicon dioxide@metal oxide/graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof
  • Silicon dioxide@metal oxide/graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof
  • Silicon dioxide@metal oxide/graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of graphite oxide: Add 1g of natural graphite flakes and 6g of potassium permanganate into 90mL of concentrated sulfuric acid and 10mL of phosphoric acid mixture, heat with magnetic stirring at 50°C for 12h, wait for the reaction to cool to room temperature, slowly add 200mL of ice water and stir for several minutes, Then add an appropriate amount of 30% hydrogen peroxide to reduce the remaining oxidant until the mixed solution is bright yellow and no bubbles are generated, then use 5% hydrochloric acid, ethanol, and deionized water to wash by centrifugation until neutral, and the resulting solution is dried in a vacuum oven at 60°C 12h, graphite oxide was obtained.

[0040] Take 0.32g graphite oxide in beaker A, add 130m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Take 0.08g of cobalt chloride hexahydrate in the B beaker, add 30mL of water to dissolve, then add 0.08g of tetraethyl orthosilicate, and ul...

Embodiment 2

[0047] The preparation method of graphite oxide is with embodiment 1. Take 0.32g of graphite oxide in beaker A, add 160m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Then pour the solution into a 200mL polytetrafluoroethylene reactor for hydrothermal reaction at 120°C for 12h. The product was centrifuged and washed with ethanol and deionized water, and the graphene airgel was obtained after freeze-drying.

[0048] The prepared graphene airgel was subjected to galvanostatic charge and discharge tests at a current density of 1A / g, and the results were as follows: image 3 As shown, its specific capacitance is about 200F / g.

Embodiment 3

[0050] The preparation method of graphite oxide is with embodiment 1. Take 0.32g graphite oxide in beaker A, add 130m water to dissolve it, and disperse it by ultrasonic for 4h to form graphene oxide aqueous solution. Take 0.08g of cobalt chloride hexahydrate in the B beaker, add 30mL of water to dissolve; add the mixed solution in the B beaker to the A beaker drop by drop, ultrasonically mix it evenly and put it into a 200mL polytetrafluoroethylene reactor with 120°C water Thermal reaction for 12h.

[0051] The product was centrifuged and washed with ethanol and deionized water, freeze-dried, and then placed in a tube furnace for calcination at a constant temperature of 350°C for 3 hours to obtain Co 3 o 4 / GA composites.

[0052] Prepared Co 3 o 4 / GA composites were subjected to constant current charge and discharge tests at a current density of 1A / g, and the results were as follows image 3 As shown, its specific capacitance is about 360F / g.

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Abstract

The invention discloses a silicon dioxide@metal oxide / graphene aerogel dual-loaded dual-coated composite material and preparation method and application thereof. The composite material is formed by dispersing silicon dioxide-coated metal oxide nanoparticles in a graphene aerogel-loaded hole structure. The preparation method comprises the steps of dropwise adding a solution containing a metal source and a silicon source into a graphene oxide dispersing liquid, performing hydrothermal reaction after ultrasonic mixing, and performing freezing, drying and calcination on the product obtained by hydrothermal reaction to obtain the composite material. The composite material shows favorable electrochemical performance when used as a supercapacitor electrode material; and moreover, the preparationmethod is simple, is low in cost and is friendly to environment, and the industrial production standard is satisfied.

Description

technical field [0001] The invention relates to a silica@metal oxide / graphene airgel (SiO 2 @MOx / GA) ternary composite material, specifically related to a double-loaded double-coated composite material composed of silica-coated metal oxide nanoparticles dispersed in the pore structure of graphene airgel, and its preparation method and The application as a supercapacitor electrode material belongs to the technical field of energy storage device preparation. Background technique [0002] The rapid development of economy and technology has also caused energy consumption and environmental pollution while improving our quality of life. Nowadays, people are more and more aware of the seriousness of the energy crisis and environmental pollution, so they are committed to developing efficient and pollution-free new energy sources. In order to make full use of these new energies, the research and development of energy storage devices should be developed as needed. As a green energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46
CPCH01G11/24H01G11/30H01G11/36H01G11/46Y02E60/13
Inventor 汪形艳阎晓静蔡治邦贺玥莹王优金显明戴友芝
Owner XIANGTAN UNIV
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