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Method for preparing directly soaking reaction type foamed nickel-graphene three-dimensional porous electrode

A three-dimensional porous, nickel foam technology, applied in electrode manufacturing, battery electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve problems such as limiting process quality controllability, complex preparation procedures and high temperature environments, and increasing material manufacturing costs. Achieve low cost, improve reaction speed and product characteristics, and increase specific surface area.

Active Publication Date: 2015-05-06
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, further studies have shown that the above-mentioned existing technologies all need to perform additional and tedious reduction reactions in order to change graphene oxide into graphene without exception. Whether it is chemical vapor phase method, high temperature heating or chemical reduction method in these schemes, Its expensive deposition equipment (tube furnace) and maintenance costs, as well as complex preparation procedures and high-temperature environments, will greatly limit the quality controllability of the process and significantly increase the production cost of materials, thus becoming a direct influence on graphene. Important Unfavorable Factors for Foam Commercial Development

Method used

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  • Method for preparing directly soaking reaction type foamed nickel-graphene three-dimensional porous electrode
  • Method for preparing directly soaking reaction type foamed nickel-graphene three-dimensional porous electrode
  • Method for preparing directly soaking reaction type foamed nickel-graphene three-dimensional porous electrode

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Effect test

Embodiment 1

[0025] First, the nickel foam is cut into a size of, for example, 1cm (length) X 1cm (width) X 1mm (height), then washed with glacial acetic acid, acetone and ethanol, then washed with deionized water for about 5 minutes and then dried place;

[0026] Then, preferably adopting oxidation peeling method (Hummers method) to prepare the graphene oxide aqueous solution that mass concentration is 0.5mg / mL~10mg / mL, and its concrete process is as follows: get 1g natural flake graphite powder, mix it with 23mL vitriol oil and 0.5mg / mL g of sodium nitrate was stirred and mixed in an ice bath, then slowly added 3 g of potassium permanganate to the solution, stirred for 2 hours, raised the temperature to 35 degrees, continued stirring for 2 hours, slowly added 46 mL of deionized water, Then the temperature was further raised to 95 degrees and maintained for 30 minutes, then about 100 mL of deionized water was added to the solution, the temperature was adjusted to normal temperature, 2 mL ...

Embodiment 2

[0030] First, the nickel foam is cut into a size of, for example, 1cm (length) X 1cm (width) X 1mm (height), then washed with glacial acetic acid, acetone and ethanol, then washed with deionized water for 5 minutes and then left to dry ;

[0031]Next, it is preferable to use the oxidation stripping method (Hummers method) to prepare the graphene oxide aqueous solution, and adjust its key parameters to a mass concentration of 0.5 mg / mL, and then directly soak the nickel foam after the cleaning treatment. The reaction temperature was controlled to be 80 °C, and the soaking time was 2 hours. During this process, the nickel foam as the substrate directly reduced graphene oxide during soaking, and deposited and grown graphene on the surface of the nickel foam, which was taken out after the reaction. Foam nickel, and wash the surface with deionized water to form a three-dimensional porous nickel foam-graphene product.

Embodiment 3

[0033] First, the nickel foam is cut into a size of, for example, 1cm (length) X 1cm (width) X 1mm (height), then washed with glacial acetic acid, acetone and ethanol, then washed with deionized water for 5 minutes and then left to dry ;

[0034] Next, it is preferable to use the oxidation stripping method (Hummers method) to prepare the graphene oxide aqueous solution, and adjust its key parameter to a mass concentration of 5 mg / mL, and then directly soak the nickel foam after the cleaning treatment. The reaction temperature was controlled at 30 °C, and the soaking time was 6 hours. During the process, the nickel foam as the substrate directly reduced graphene oxide during soaking, and deposited and grown graphene on the surface of the nickel foam. After the reaction, the foam was taken out. Ni, and washed the surface with deionized water to form a three-dimensional porous nickel-graphene foam product.

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Abstract

The invention discloses a method for preparing a directly soaking reaction type foamed nickel-graphene three-dimensional porous electrode. The method comprises the following steps: cleaning foamed nickel by adopting glacial acetic acid, acetone and ethanol sequentially; cleaning the foamed nickel by using deionized water, airing and standing; preparing graphene oxide aqueous solution with the mass concentration of 0.5-5mg / mL, directly soaking the foamed nickel into the solution, standing, and reacting to form the foamed nickel-graphene product of a three-dimensional porous structure, wherein the reaction temperature is controlled to be 30-80 DEG C in the soaking process, and the soaking time is 2-6 hours. According to the method, the reduction reaction can be rapidly finished by virtue of a simple and easily controlled soaking process only, direct deposited growth of graphene on the surface of the substrate is realized based on a substrate-enhanced effect of the foamed nickel, the product with the three-dimensional porous structure and high specific surface area is formed, the overall reaction rate is correspondingly and greatly improved, and the method is particularly suitable for large-scale production purposes.

Description

technical field [0001] The invention belongs to the field of composite electrode material preparation, and more particularly relates to a method for preparing a foam nickel-graphene three-dimensional porous electrode of direct soaking reaction type. Background technique [0002] Graphene is a new type of carbon material composed of single-layer carbon atoms closely packed. Its unique two-dimensional hexagonal honeycomb crystal structure endows it with excellent electrical, thermal and mechanical properties and is widely used in electrode materials. , catalyst carrier, gas adsorption, storage and separation and many other fields. However, the two-dimensional structural characteristics of graphene make it easy to agglomerate, which directly reduces its specific surface area and limits the practical application of graphene materials. an effective means of application. [0003] In the prior art, Liu Yunqi and others from the Institute of Chemistry, Chinese Academy of Sciences ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01G11/86C23C18/16
CPCC23C18/16H01G11/86H01M4/0497H01M4/1393Y02E60/10
Inventor 王帅张哲野
Owner HUAZHONG UNIV OF SCI & TECH
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