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Preparation method of cobaltosic oxide composite graphene three-dimensional aerogel

A technology of composite graphene and cobalt tetroxide, applied in the field of materials science, can solve the problems of poor thermal stability and low specific surface area, and achieve the effects of good thermal stability, large specific surface area and strong shape controllability

Active Publication Date: 2016-02-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned technical problems in the prior art, the invention provides a kind of preparation method of tricobalt tetroxide composite graphene three-dimensional aerogel, the preparation method of described this three-cobalt tetraoxide composite graphene three-dimensional airgel solves the problems in the prior art. The technical problems of low specific surface area and poor thermal stability of cobalt oxide composite materials

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  • Preparation method of cobaltosic oxide composite graphene three-dimensional aerogel
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  • Preparation method of cobaltosic oxide composite graphene three-dimensional aerogel

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Embodiment 1

[0029] A preparation method of tricobalt tetroxide composite graphene three-dimensional airgel, comprising the steps of:

[0030] (1), a step for preparing graphene oxide, at room temperature, 5g graphite flakes, 1gNaNO 3 Add it to a 1L beaker one by one, mix well and slowly add 250g concentrated sulfuric acid, stir for 30-40min, then add 20gKMnO at a rate of 1g / min 4 , and then continue to stir until the solution turns purple, place it for 5 days until the graphite flakes are basically oxidized completely, then add 500mL of water to dilute, and then add 20g of H2O with a volume percentage concentration of 30%. 2 o 2 aqueous solution, stirred evenly, until the solution changed from purple to yellow during the stirring process, and a large number of bubbles were generated in the process to obtain a reaction solution; the graphite flakes, NaNO 3 , concentrated sulfuric acid, KMnO 4 、H 2 o 2 The amount, calculated by mass ratio, that is, graphite flakes: NaNO 3 : concentrat...

Embodiment 2

[0037] A preparation method of tricobalt tetroxide composite graphene three-dimensional airgel, specifically comprising the steps of:

[0038] 1) A step for preparing graphene oxide, at room temperature, 5g graphite sheet, 1gNaNO 3 Add it to a 1L beaker one by one, mix well and slowly add 250g concentrated sulfuric acid, stir for 30-40min, then add 20gKMnO at a rate of 1g / min 4 , and then continue to stir until the solution turns purple, place it for 5 days until the graphite flakes are basically oxidized completely, then add 500mL of water to dilute, and then add 20g of H2O with a volume percentage concentration of 30%. 2 o 2 aqueous solution, stirred evenly, until the solution changed from purple to yellow during the stirring process, and a large number of bubbles were generated in the process to obtain a reaction solution; the graphite flakes, NaNO 3 , concentrated sulfuric acid, KMnO 4 、H 2 o 2 The amount, calculated by mass ratio, that is, graphite flakes: NaNO 3 : ...

Embodiment 3

[0045] A preparation method of tricobalt tetroxide composite graphene three-dimensional airgel, specifically comprising the steps of:

[0046] 1) A step for preparing graphene oxide, at room temperature, 5g graphite sheet, 1gNaNO 3 Add it to a 1L beaker one by one, mix well and slowly add 250g concentrated sulfuric acid, stir for 30-40min, then add 20gKMnO at a rate of 1g / min 4 , and then continue to stir until the solution turns purple, place it for 5 days until the graphite flakes are basically oxidized completely, then add 500mL of water to dilute, and then add 20g of H2O with a volume percentage concentration of 30%. 2 o 2 aqueous solution, stirred evenly, until the solution changed from purple to yellow during the stirring process, and a large number of bubbles were generated in the process to obtain a reaction solution; the graphite flakes, NaNO 3 , concentrated sulfuric acid, KMnO 4 、H 2 o 2 The amount, calculated by mass ratio, that is, graphite flakes: NaNO 3 : ...

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Abstract

The invention discloses a preparation method of a cobaltosic oxide composite graphene three-dimensional aerogel. With cobaltous acetate as a cobalt source and oxidized graphene as a base, by a hydrothermal-freezing-drying method, the cobaltosic oxide composite graphene three-dimensional aerogel is prepared by controlling hydrothermal reaction time. The cobaltosic oxide composite graphene three-dimensional aerogel obtained by the method disclosed by the invention is good in heat stability, high in crystallization degree and large in specific surface area; and cobaltosic oxide is high in morphology controllability, and is an ideal energy material. The preparation technology and required equipment of the cobaltosic oxide composite graphene three-dimensional aerogel are simple; the reaction temperature is obviously lowered; and mass production is easy to achieve.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a composite graphene three-dimensional airgel, in particular to a preparation method of a three-dimensional cobalt tetroxide composite graphene aerogel. Background technique [0002] In the 21st century, with the continuous development of society, human beings have intensified the development and utilization of natural resources, and the consumption of non-renewable energy is astonishing, and the environmental protection problems caused by it are also becoming more and more prominent. In recent years, due to the frequent crises of traditional non-renewable energy sources such as petroleum and coal, how to change the current bad energy consumption structure has become the focus of attention. etc.) is of great significance. Lithium-ion batteries are an important energy storage medium for effectively storing these discontinuous energy sources, which can convert discontinuous energy s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/587H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/52H01M4/587H01M10/0525Y02E60/10
Inventor 韩生王驰蒋建忠刘凡蔺华林余焓于飞李原婷卢德力蒋继波邱丰祝俊何忠义
Owner SHANGHAI INST OF TECH
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