Carbon quantum dot-CoFe type Prussian blue nanocomposite material as well as preparation method and application thereof

A nanocomposite material, Prussian blue-like technology, applied in the preparation/purification of carbon, manufacturing of hybrid/electric double layer capacitors, and compounding cyanide, etc., can solve the problem of poor rate performance of Prussian blue-like compounds, limiting the application of supercapacitors, Unsatisfactory rate performance and other issues, to achieve the effect of improving fast charge and discharge and cycle life, improving electronic conductivity, and high rate performance

Active Publication Date: 2020-04-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the poor conductivity of electrons in the particles of Prussian blue-like compounds and between particles leads to poor rate performance of Prussian blue-like compounds, which limits their application in supercapacitors.
In the patent CN101546650A, the supercapacitor electrode material Prussian blue derivative Co was prepared by chemical coprecipitation method 2 [Fe(CN) 6 ], which has low specific capacity and unsatisfactory rate performance

Method used

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  • Carbon quantum dot-CoFe type Prussian blue nanocomposite material as well as preparation method and application thereof
  • Carbon quantum dot-CoFe type Prussian blue nanocomposite material as well as preparation method and application thereof
  • Carbon quantum dot-CoFe type Prussian blue nanocomposite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take by weighing 2g potassium citrate and be dissolved in 20mL deionized water and be mixed with potassium citrate solution, transfer in the hydrothermal synthesizer, heat 180 degrees Celsius, the time obtains carbon quantum dot solution in 3 hours; Then take by weighing 0.146g cobalt nitrate hexahydrate ( 0.5mmol) was dissolved in the carbon quantum dot solution to prepare a carbon quantum dot-cobalt nitrate mixed solution, and the concentration of cobalt nitrate hexahydrate was 0.025mol / L; then weighed 0.099g potassium ferricyanide (0.3mmol) and dissolved it in 20mL Potassium ferricyanide solution was prepared in deionized water; under stirring, the potassium ferricyanide solution was slowly added dropwise to the carbon quantum dot-cobalt nitrate mixed solution, the stirring was stopped, and the room temperature was left to age for 24 hours; the sample was filtered, and the deionized Washed three times with deionized water and dried at 90°. from figure 1 with figur...

Embodiment 2

[0038] Take by weighing 4g potassium citrate and be dissolved in 20mL deionized water and be mixed with potassium citrate solution, transfer in the hydrothermal synthesizer, heat 200 degrees Celsius, the time obtains carbon quantum dot solution in 5 hours; Then take by weighing 0.175g cobalt nitrate hexahydrate ( 0.6mmol) is dissolved in carbon quantum dot solution and is mixed with carbon quantum dot-cobalt nitrate mixed solution, and the concentration of cobalt nitrate hexahydrate is 0.03mol / L; Then weigh 0.132g potassium ferricyanide (0.4mmol) and dissolve in 20mL Potassium ferricyanide solution was prepared in deionized water; under stirring, the potassium ferricyanide solution was slowly added dropwise to the carbon quantum dot-cobalt nitrate mixed solution, the stirring was stopped, and the room temperature was left to age for 18 hours; the sample was filtered, and the deionized Washed 5 times with deionized water and dried at 60°C. from Figure 5 with Image 6 A carbo...

Embodiment 3

[0042] Take by weighing 6g potassium citrate and be dissolved in 20mL deionized water and be mixed with potassium citrate solution, transfer in the hydrothermal synthesizer, heat 190 degrees Celsius, the time obtains carbon quantum dot solution in 6 hours; Then take by weighing 0.291g cobalt nitrate hexahydrate ( 1mmol) is dissolved in carbon quantum dot solution and is mixed with carbon quantum dot-cobalt nitrate mixed solution, and the concentration of cobalt nitrate hexahydrate is 0.05mol / L; Then weigh 0.165g potassium ferricyanide (0.5mmol) and dissolve in 20mL to Potassium ferricyanide solution was prepared in deionized water; under stirring, the potassium ferricyanide solution was slowly added dropwise into the carbon quantum dot-cobalt nitrate mixed solution, the stirring was stopped, and it was aged at room temperature for 24 hours; the sample was filtered and deionized using Wash 4 times with water and dry at 70°. from Figure 9 with Figure 10 A carbon quantum dot-...

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Abstract

The invention relates to a carbon quantum dot-CoFe Prussian blue nanocomposite material as well as a preparation method and application thereof, and belongs to the technical field of electrode material preparation. The preparation method is a two-step synthesis method and comprises the steps: firstly, taking potassium citrate as a carbon source of carbon quantum dots, controlling the dosage of potassium citrate, hydrothermal synthesis temperature, hydrothermal synthesis time and other reaction conditions, and preparing a carbon quantum dot solution through a hydrothermal synthesis method; thentaking carbon quantum dots, inorganic cobalt salt and potassium ferricyanide as reaction raw materials, preparing the carbon quantum dot-CoFe Prussian blue composite material with good dispersity byadopting a liquid-phase coprecipitation reaction method, and enabling the size of nanospheres to be about 200-400 nm. When the carbon quantum dot-CoFe Prussian blue composite material prepared by themethod is used as an electrode material, the capacity of a supercapacitor is improved, the rapid charging and discharging capacity of the supercapacitor is greatly improved, and the supercapacitor hasexcellent rate capability and long cycle service life.

Description

technical field [0001] The invention relates to a carbon quantum dot-CoFe-like Prussian blue nanocomposite material and a preparation method and application thereof, belonging to the technical field of electrode material preparation. Background technique [0002] Carbon quantum dots are composed of dispersed spherical carbon particles with extremely small size (below 10nm), and have good application prospects in many fields such as medical imaging technology, environmental monitoring, chemical analysis, etc., but their application in supercapacitor electrode materials Fields are rarely looked at. Prussian blue, formerly known as Berlin blue, is a dark blue pigment whose structure is formed by the coordination between Fe(II) and Fe(III) and cyano group (-CN-). Without breaking the overall crystal structure, changing its chemical composition, ferrous ions and ferric ions can be replaced by different other transition metals to generate a series of new compounds called Prussian...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01C3/11C01C3/12H01G11/24H01G11/30H01G11/32H01G11/86
CPCC01C3/11C01C3/12C01P2002/72C01P2004/03C01P2004/62C01P2004/80C01P2006/40C01B32/05H01G11/24H01G11/30H01G11/32H01G11/86Y02E60/13
Inventor 刘伟宋朝霞赵忠夫刘贵昌
Owner DALIAN UNIV OF TECH
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