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A kind of nickel cobalt oxide graphene composite material and its application and preparation method

A composite material and graphene technology, applied in capacitors, circuits, electrolytic capacitors, etc., can solve the problems of large particle size and poor conductivity of nickel cobaltate, and achieve the effects of small size, improved capacitance performance, and easy large-scale production.

Inactive Publication Date: 2016-08-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of poor electrical conductivity and large particle size of nickel cobaltate existing in the prior art, the present invention provides a nickel cobaltate-graphene composite material and a preparation method thereof, whose typical structural feature is nickel cobaltate nanometer The wires are uniformly grown on a single-layer graphene sheet, which is a nanocomposite material with a quasi-two-dimensional structure

Method used

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  • A kind of nickel cobalt oxide graphene composite material and its application and preparation method
  • A kind of nickel cobalt oxide graphene composite material and its application and preparation method
  • A kind of nickel cobalt oxide graphene composite material and its application and preparation method

Examples

Experimental program
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Embodiment 1

[0029] (1) Preparation of graphite oxide. Graphite oxide is prepared by oxidizing graphite with strong oxidants such as nitric acid and sulfuric acid;

[0030] (2) Take 0.3g graphite oxide and add 100mL deionized water to ultrasonic for 2.5h to prepare graphene oxide solution;

[0031] (3) Add 10ml 0.002mol / L cobalt chloride aqueous solution and 10mL 0.001mol / L nickel chloride aqueous solution to (2), and stir for 0.5h;

[0032] (4) Dissolve 2g of sodium hydroxide in 10mL of deionized water and stir for 1h;

[0033] (5) Mix and stir the system obtained in (3) and (4) for 2 hours, then transfer to a high-temperature reactor, and react at 160°C for 12 hours;

[0034] (6) The product obtained in (5) was filtered, washed, vacuum-dried at 60°C for 18 hours, and then heat-treated in a tube furnace at 350°C for 3 hours to obtain a nickel cobaltate nanowire-graphene composite material.

[0035] figure 1 It is the X-ray diffraction (XRD) pattern of the obtained nickel cobaltate nan...

Embodiment 2

[0037] (1) Same as Step 1 in Example 1;

[0038] (2) Take 0.5g graphite oxide and add 100mL deionized water to ultrasonic for 2h to prepare graphene oxide solution;

[0039] (3) Add 10ml 0.002mol / L cobalt nitrate aqueous solution and 10mL 0.001mol / L nickel nitrate aqueous solution to (2), and stir for 0.5h;

[0040] (4) Dissolve 5g of ammonium bicarbonate in 10mL of deionized water and stir for 1h;

[0041] (5) Mix and stir the system obtained in (3) and (4) for 2 hours, then transfer to a high-temperature reactor, and react at 200°C for 8 hours;

[0042] (6) The product obtained in (5) was filtered, washed, vacuum-dried at 80°C for 12 hours, and then heat-treated in a tube furnace at 500°C for 2 hours to obtain a nickel cobaltate nanowire-graphene composite material.

[0043] Characterized by XRD, the obtained product is nickel cobaltate with spinel structure (JCPDS 20-0781), without NiO and Co 3 o 4 impurity peaks. In the transmission electron microscope (TEM) photo, th...

Embodiment 3

[0045] (1) Same as Step 1 in Example 1;

[0046] (2) Take 0.1g graphite oxide and add 100mL deionized water to ultrasonic for 0.5h to prepare graphene oxide solution;

[0047] (3) Add 20ml 0.001mol / L cobalt acetate aqueous solution and 20mL 0.0005mol / L nickel acetate aqueous solution to (2), stir for 1h;

[0048] (4) Dissolve 10g of sodium carbonate in 10mL of deionized water and stir for 1 hour;

[0049] (5) Mix and stir the system obtained in (3) and (4) for 2 hours, then transfer to a high-temperature reactor, and react at 120°C for 24 hours;

[0050] (6) The product obtained in (5) was filtered, washed, vacuum-dried at 100°C for 10 hours, and then heat-treated in a tube furnace at 200°C for 6 hours to obtain a nickel cobaltate nanowire-graphene composite material.

[0051] Characterized by XRD, the obtained product is nickel cobaltate with spinel structure (JCPDS 20-0781), without NiO and Co 3 o 4 impurity peaks. In the transmission electron microscope (TEM) photo, th...

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Abstract

The invention relates to a nickel cobaltate-graphene composite material and a preparation method thereof. The composite material comprises graphene and nickel cobaltate, wherein nickel cobaltate nanowires are uniformly grown on a graphene sheet, the wire length of the nickel cobaltate nanowires is 50-300nm, and the wire width is 5-30nm. The preparation method comprises the following steps of: taking a graphene oxide water solution and a cobalt salt and nickel salt water solution which are dispersed in an ultrasonic manner, mixing, further adding a precipitator, uniformly stirring and mixing, transferring into a high-temperature reaction kettle, performing hydro-thermal reaction for a certain period of time, filtering, washing and drying an obtained product, and further performing thermal treatment so as to obtain the nickel cobaltate nanowire-graphene composite material. The nickel cobaltate nanowire-graphene composite material prepared by the method disclosed by the invention has the advantages of high single-electrode capacitance and good cycle performance, and is suitable for being used as an electrode material of a super-capacitor.

Description

technical field [0001] The invention relates to a nickel cobaltate-graphene composite material and a preparation method thereof. Background technique [0002] With the development of social economy, people pay more and more attention to green energy and ecological environment. As a new type of energy storage device, supercapacitors are increasingly valued. Compared with various energy storage devices widely used at present, the charge storage capacity of supercapacitors is much higher than that of physical capacitors, and the charging and discharging speed and efficiency are better than primary or secondary batteries. In addition, supercapacitors also have the characteristics of no pollution to the environment, long cycle life, wide operating temperature range, and high safety. At present, carbon materials, metal oxides and conductive polymers can all be used as supercapacitor electrode materials, among which metal oxides have attracted much attention due to their high cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 何光裕王林陈海群纪俊玲席海涛孙小强汪信
Owner CHANGZHOU UNIV
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