Preparation and application of laminated structure cobalt and aluminum double hydroxide-reduction and oxidation graphene composite materials

A double hydroxide, lamellar structure technology, applied in the field of composite materials, can solve problems such as instability, and achieve the effects of easy operation, excellent rate performance, and high electrochemical capacitance behavior

Inactive Publication Date: 2013-05-08
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among transition metal hydroxides, Co(OH) 2 It has a high theoretical specific capacitance. In nature, cobalt hydroxide mainly exists in two crystal forms: and ,but Unstable, easily converted to , therefore, the researchers used other metal ions to partially replace the cobalt ions in cobalt hydroxide through the method of isomorphic replacement to improve stability

Method used

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  • Preparation and application of laminated structure cobalt and aluminum double hydroxide-reduction and oxidation graphene composite materials
  • Preparation and application of laminated structure cobalt and aluminum double hydroxide-reduction and oxidation graphene composite materials
  • Preparation and application of laminated structure cobalt and aluminum double hydroxide-reduction and oxidation graphene composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of graphene oxide GO

[0047] a. Take 92mL of concentrated sulfuric acid and place it in an ice-water bath to lower the temperature to 0-5°C, slowly add 4g of natural graphite and 2g of anhydrous sodium nitrate, and continue stirring for 30 minutes.

[0048] b. Add 13 g of potassium permanganate to the above mixed solution, maintain the ice bath for 1 h, take the device out of the ice bath, stir at room temperature for 3 h, and add 180 mL of water dropwise, and stir for 20 min.

[0049] c. Continue to add 560mL water to the mixed solution, and then add 50mL 30% hydrogen peroxide drop by drop. When the static supernatant is colorless, remove the supernatant, then add 560mL water, adjust the pH to 7 with KOH, and remove the supernatant after standing still for 24 hours liquid, filtered, washed with water and ethanol, and dried under vacuum at 60 °C for 24 h to obtain GO.

[0050] (2) Preparation of cobalt aluminum double hydroxide-reduced graphene oxide c...

Embodiment 2

[0062] Step (2) In the preparation of the cobalt-aluminum double hydroxide-reduced graphene oxide composite material with a lamellar structure, 30mg of graphene oxide GO was dissolved in 60mL of water, and ultrasonically dispersed for 2 hours to form a bright yellow solution. Others were the same as those in the examples 1 is exactly the same.

[0063] In the composite material, the mass percentages of cobalt aluminum double hydroxide and reduced graphene oxide are 1.47% and 98.53%.

[0064] The specific capacitance of the electrode material is 795F / g, the energy density is 27.6Wh / kg, and the power density is 250W / kg.

Embodiment 3

[0066] Step (2) In the preparation of the cobalt-aluminum double hydroxide-reduced graphene oxide composite material with a sheet structure, 40 mg of graphene oxide GO was dissolved in 80 mL of water, and ultrasonically dispersed for 2 hours to form a bright yellow solution. Others are identical to Example 1.

[0067] In the composite material, the mass percentages of cobalt aluminum double hydroxide and reduced graphene oxide are 1.87% and 98.13%.

[0068] The specific capacitance of the electrode material is 830.4F / g, the energy density is 28.8Wh / kg, and the power density is 250W / kg.

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Abstract

The invention provides a preparation method of laminated structure cobalt and aluminum double hydroxide-reduction and oxidation graphene composite materials, and belongs to the technical field of composite materials. The method comprises that firstly Co (NO3)2 and AL (NO3)2 are dissolved in water to form mixed solutions; then oxidized graphene is in fully ultrasonic dispersion in the water to form luminous yellow solutions, and the luminous yellow solutions are added to the mixed solutions to be mixed for 20-30 hours; then hexamethylene tetramine is added to a system for backflow of 12-24 hours at the temperature of 100-160 DEG C; and after reaction is completed, the composite materials are gained through filtration, washing and drying. The composite materials prepared through the preparation method simultaneously have an electrical double-layer capacitor of RGO and cobalt and aluminum double hydroxide pseudo-capacitance energy storage characteristics, and thus show high electrochemistry capacitance behaviors, excellent rate capability and good circulatory stability performance, have high energy density and high power density, and can serve as electrode materials of supercapacitors.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a preparation method of a cobalt aluminum double hydroxide-reduced graphene oxide composite material with a lamellar structure, and the invention also relates to the cobalt aluminum double hydroxide-reduced graphene oxide composite Application of materials in the preparation of supercapacitor electrodes. Background technique [0002] Energy and environmental issues are two major problems that human beings need to solve urgently. Today, with the depletion of fossil energy, increasingly serious environmental pollution and global warming, it is particularly urgent to seek renewable green energy to replace traditional fossil energy and to seek harmony between man and the environment. As a new type of energy storage device, supercapacitor (also known as electrochemical capacitor) occupies an important position in the new energy system due to its many advantages such as high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCY02E60/13
Inventor 吴红英鲁爱莲胡中爱胡英瑛徐欢
Owner NORTHWEST NORMAL UNIVERSITY
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