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Preparation method of foamed nickel-graphene three-dimensional porous electrode by direct immersion reaction

A technology of three-dimensional porous nickel foam, which is applied in the manufacture of electrodes, battery electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of limited process quality controllability, complex preparation process and high temperature environment, and increased material production cost. Achieve low cost, improve reaction speed and product characteristics, and increase specific surface area

Active Publication Date: 2017-01-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of foamed nickel-graphene three-dimensional porous electrode by direct immersion reaction
  • Preparation method of foamed nickel-graphene three-dimensional porous electrode by direct immersion reaction
  • Preparation method of foamed nickel-graphene three-dimensional porous electrode by direct immersion reaction

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Effect test

Embodiment 1

[0025] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for about 5 minutes and then dry it place;

[0026] Next, the oxidation exfoliation method (Hummers method) is preferably used to prepare a graphene oxide aqueous solution with a mass concentration of 0.5 mg / mL to 10 mg / mL. The specific process is as follows: take 1 g of natural flake graphite powder, mix it with 23 mL of concentrated sulfuric acid and 0.5 The sodium nitrate of 2g was stirred and mixed under ice-bath conditions, then slowly added 3g potassium permanganate to the solution, after stirring for 2 hours, the temperature was raised to 35 degrees, after continuing to stir for 2 hours, slowly added 46mL of deionized water, Then the temperature was further raised to 95 degrees and maintained for 30 minutes, then about 100mL of deionized water was added to the solution, the temperat...

Embodiment 2

[0030] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for 5 minutes and then dry it ;

[0031]Next, it is preferred to use the oxidation exfoliation 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 foamed nickel after cleaning and let it stand for reaction, wherein the overall system The reaction temperature is controlled at 80°C, and the soaking time is 2 hours. During this process, the nickel foam as the substrate directly reduces graphene oxide during soaking, and deposits and grows graphene on the surface of the nickel foam. After the reaction, take it out Foam nickel, and wash the surface with deionized water to form a three-dimensional porous nickel foam-graphene product.

Embodiment 3

[0033] First cut the nickel foam into a size such as 1cm (length) X 1cm (width) X 1mm (height), then clean it with glacial acetic acid, acetone and ethanol, then wash it with deionized water for 5 minutes and then dry it ;

[0034] Next, preferably adopt oxidation exfoliation method (Hummers method) to prepare graphene oxide aqueous solution, and its key parameter is adjusted to mass concentration 5mg / mL, then the foamed nickel after cleaning is directly soaked wherein standstill reaction, wherein the whole system The reaction temperature was controlled at 30°C, and the soaking time was 6 hours. During this process, the nickel foam as the substrate directly reduced graphene oxide during soaking, and deposited and grew graphene on the surface of the nickel foam. After the reaction, the foam was taken out Nickel, and the surface is cleaned with deionized water to form a foamed nickel-graphene product with a three-dimensional porous structure.

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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 preparation of composite electrode materials, and more specifically relates to a method for preparing a foamed nickel-graphene three-dimensional porous electrode of a direct soaking reaction type. Background technique [0002] Graphene is a new type of carbon material composed of a single layer of carbon atoms tightly 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 structure of graphene makes it easy to agglomerate, which directly reduces its specific surface area and limits the practical application of graphene materials. However, assembling two-dimensional structure graphene materials into three-dimensional macroscopic porous structures is the most important way to re...

Claims

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Application Information

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Patent Type & Authority Patents(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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