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Nickel sulfide nanosheet/carbon quantum dot composite material and preparation method and application thereof

A technology of carbon quantum dots and composite materials, which is applied in the field of nickel sulfide nanosheets/carbon quantum dot composite materials, to achieve the effects of low production cost, simple control, and improved rate performance and cycle performance

Active Publication Date: 2019-04-16
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are very limited research reports on the electrochemical performance of NiS / CQD composites prepared by a simple and feasible method.

Method used

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  • Nickel sulfide nanosheet/carbon quantum dot composite material and preparation method and application thereof
  • Nickel sulfide nanosheet/carbon quantum dot composite material and preparation method and application thereof
  • Nickel sulfide nanosheet/carbon quantum dot composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. At room temperature, foam nickel (size: 1*4cm 2 ) into a beaker, followed by ultrasonication with acetone, 0.5mol / L hydrochloric acid, distilled water, and dehydrated ethanol for 20 minutes, dried and weighed for later use;

[0035] 2. Add 5mmol of nickel nitrate and 10mmol of hexamethylenetetramine into 35mL of deionized water and stir for 10min to obtain a mixed solution;

[0036] 3. Put nickel foam (size: 1*4cm 2 ) after immersing in the mixed solution obtained in step 2, ultrasonically for 30 minutes, take out the magnet, and then transfer the above mixed solution and nickel foam to a polytetrafluoroethylene reactor; the reactor is sealed and placed in a blast drying oven, and the reaction condition is 100°C , the reaction time is 10 hours;

[0037] 4. After stopping the reaction and cooling down naturally, take out the sample in the reactor, wash it with a large amount of water, transfer 30mL of 0.1mol / L sodium sulfide solution and nickel foam to the polytetra...

Embodiment 2

[0040] 1. At room temperature, foam nickel (size: 1*4cm 2 ) into a beaker, followed by ultrasonication with acetone, 0.5mol / L hydrochloric acid, distilled water, and absolute ethanol for 20 minutes, dried and weighed for later use;

[0041] 2. Add 5 mmol of nickel nitrate and 10 mmol of hexamethylenetetramine to 35 mL of 1 mg / mL carbon quantum dot mixed solution and stir for 10 minutes to obtain a carbon quantum dot / nickel hydroxide mixture precursor solution;

[0042] 3. Put nickel foam (size: 1*4cm 2 ) after immersing in the carbon quantum dot / nickel hydroxide mixture precursor solution obtained in step 2, ultrasonically for 30 minutes, the magneton was taken out, and then the above-mentioned mixed solution and nickel foam were transferred to a polytetrafluoroethylene reactor; the reactor was sealed and placed in Blast drying oven, react at 100°C for 10 hours;

[0043] 4. After stopping the reaction and cooling down naturally, take out the sample in the reactor, wash it wi...

Embodiment 3

[0047] 1. At room temperature, foam nickel (size: 1*4cm 2 ) into a beaker, followed by ultrasonication with acetone, 0.5mol / L hydrochloric acid, distilled water, and absolute ethanol for 20 minutes, dried and weighed for later use;

[0048] 2. Add 5 mmol of nickel chloride and 10 mmol of hexamethylenetetramine to 35 mL of 1.5 mg / mL carbon quantum dot mixed solution and stir for 10 minutes to obtain a carbon quantum dot / nickel hydroxide mixture precursor solution;

[0049] 3. Put nickel foam (size: 1*4cm 2 ) after immersing in the carbon quantum dot / nickel hydroxide mixture precursor solution obtained in step 2, ultrasonically for 30 minutes, the magneton was taken out, and then the above-mentioned mixed solution and nickel foam were transferred to a polytetrafluoroethylene reactor; the reactor was sealed and placed in Blast drying oven, react at 120°C for 8 hours;

[0050] 4. After stopping the reaction and cooling down naturally, take out the sample in the reactor, wash it ...

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Abstract

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a nickel sulfide nanosheet / carbon quantum dot composite material and a preparation method and application thereof. The composite material is prepared by the following steps: ultrasonically dispersing carbon quantum dots in an aqueous solution; adding soluble nickel salt and hexamethylenetetramine to obtain a carbon quantum dot / nickel hydroxide mixture precursor solution, enabling the precursor solution to grow on the surface of the foamed nickel at the temperature of 90-120 DEG C, mixing the carbon quantum dot / nickel hydroxide mixture with the sodium sulfide solution, performing hydrothermal reaction at the temperature of 100-140 DEG C, washing with water, and drying to obtain the composite material. The preparation method has the characteristics of simple preparation process, stable process, easiness in operation, low cost, no pollution and the like. The nickel sulfide nanosheet / carbon quantum dot composite material has a unique honeycomb nanosheet structure, which is beneficial to effective infiltration of an electrolyte, can enable the electrolyte to be in full contact with active substances, improves the electrochemical performance of the material, and can be used as a supercapacitor electrode material.

Description

technical field [0001] The invention belongs to the technical field of supercapacitor electrode materials, and more specifically relates to a nickel sulfide nanosheet / carbon quantum dot composite material and its preparation and application. Background technique [0002] As a promising energy storage device, supercapacitors have attracted extensive attention from many researchers in recent years. The electrode material commonly used in supercapacitors-carbon-based double-layer capacitor materials, due to its relatively low specific capacity, its application development is limited and it is difficult to meet the growing demand for electrical energy storage devices. In general, oxides or sulfides containing transition metals have higher specific capacities. Among them, nickel sulfide has been widely studied as an electrode material in high-performance supercapacitors, lithium-ion batteries and solar cells because of its advantages of low price, easy preparation, low toxicity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/86B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36H01G11/86Y02E60/13
Inventor 孙志鹏方路峻吴方丹余锦超史晓艳邵涟漪
Owner GUANGDONG UNIV OF TECH
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