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Preparation method for nickel-oxide/ reduced-graphene-oxide nanosheet composite materials

A nano-composite material, graphite nano-sheet technology, applied in the field of composite materials, can solve problems such as low specific capacitance

Inactive Publication Date: 2014-03-12
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the one-sidedness of the electrochemical performance of a single electrode material can no longer meet the demand. The supercapacitor electrode material obtained by compounding by certain means has excellent electrochemical performance, good conductivity, and high stability, and has broad application prospects and commercial uses.
[0003] Although NiO has good redox properties and a large theoretical specific capacitance (2584F / g at a potential window of 0.5V), due to the constraints of its crystal structure and electrical conductivity, the specific capacitance that appears in the actual application process much lower than its theoretical specific capacitance

Method used

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  • Preparation method for nickel-oxide/ reduced-graphene-oxide nanosheet composite materials
  • Preparation method for nickel-oxide/ reduced-graphene-oxide nanosheet composite materials
  • Preparation method for nickel-oxide/ reduced-graphene-oxide nanosheet composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of CNGO: Take 46mL of concentrated sulfuric acid with a mass fraction of 98% in a 250mL beaker, and use an ice-water bath to lower the temperature below 4°C. Stir vigorously and add 1g of multi-walled carbon nanotubes at the same time, and wait until it is in an ice-water bath Stir vigorously for 0.5 h; add 0.5 g of sodium nitrate and 4 g of potassium permanganate to the above mixture, and stir vigorously in an ice-water bath for 1 h, then take out the beaker, react vigorously at room temperature for 3 h, then slowly add 92 mL of distilled water dropwise, and wait for Return to room temperature, add 180mL distilled water again, add 15mL 30% H2O after 10min 2 o 2; Stand still for 24 hours, the obtained product is suction filtered, washed with hydrochloric acid solution with a mass fraction of 30%, and then washed with distilled water for 4 to 5 times, then added water / ethanol (7:3v / v), centrifuged at 5000rpm, and the supernatant was taken solution, dilute...

Embodiment 2

[0035] 1, the preparation of CNGO: with embodiment 1.

[0036] 2. Preparation of NiO / rCNGO: 40 mL of CNGO dispersion liquid, other same as Example 1.

[0037] 3. Preparation of capacitance electrodes: same as in Example 1.

[0038] 4. Electrochemical performance test

[0039] (1) Charge and discharge test: the test method is the same as in Example 1. Test results: the specific capacitance value is 928F / g ( Figure 7 c).

[0040] (2) Cycle life test: The test method is the same as in Example 1. Test results: After 3000 cycles, the specific capacitance is still 57% of the initial value.

Embodiment 3

[0042] 1, the preparation of CNGO: with embodiment 1.

[0043] 2. Preparation of NiO / rCNGO: 60 mL of CNGO dispersion liquid, other same as Example 1.

[0044] 3. Preparation of capacitance electrodes: same as in Example 1.

[0045] 4. Electrochemical performance test

[0046] (1) Charge and discharge test: the test method is the same as in Example 1. Test results: the specific capacitance value is 1010F / g ( Figure 7 d).

[0047] (2) Cycle life test: The test method is the same as in Example 1. Test results: After 3000 cycles, the specific capacitance is still 68% of the initial value ( Figure 8 ).

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Abstract

The invention provides a preparation method for nickel-oxide / reduced-graphene-oxide nanosheet composite materials. The preparation method includes using multiwalled carbon nanotubes as raw materials and adopting the Hummer method to obtain graphene-oxide nanosheets with lamellar structures and easy to disperse through oxidation; ultrasonically dispersing the grapheme oxide nanosheets and Ni (NO3)2 6H2O in ethyl-alcohol solvent to perform solvent thermal reaction at the temperature of 140-180 DEG C for 10-12 hours; after the temperature is cooled to room temperature, filtering, washing with water and absolute ethyl alcohol and drying in vacuum to obtain precursor composite materials; preforming thermal treatment on the precursor composite materials under air atmosphere and at the temperature of 200-250 DEG C for 3-5 hours to obtain the nickel-oxide / reduced-graphene-oxide nanosheet composite materials. The composite materials prepared by the method integrate the characteristics of NiO and rCNGO, and are enabled to have better electrochemistry performance as compared with homogenous materials through synergistic effects among components, thereby being capable of serving as electrode materials of super capacitors.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a method for preparing a composite material nickel oxide / reduced graphene oxide nanosheet composite material NiO / rCNGO for supercapacitors. technical background [0002] With the development and utilization of clean energy, energy storage is particularly important, and it is imminent to develop a new type of energy storage device. Supercapacitor is a new type of energy storage / conversion device, which is widely used in portable electronic products, hybrid electric vehicles and large industrial equipment etc. Electrode material is the most critical factor determining the electrochemical performance of supercapacitors. However, the one-sidedness of the electrochemical performance of a single electrode material can no longer meet the demand. The supercapacitor electrode material obtained by compounding by certain means has excellent electrochemical performance, good cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/36H01G11/86
Inventor 胡中爱贾鹏飞李晓婷李志敏李丽张子瑜杨玉英
Owner NORTHWEST NORMAL UNIVERSITY
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