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A carbon quantum dot-cofe-like Prussian blue nanocomposite material and its preparation method and application

A nanocomposite material, Prussian blue-like technology, applied in the preparation/purification of carbon, hybrid/electric double-layer capacitor manufacturing, and compounding cyanide, etc., can solve the 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: 2021-09-24
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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  • A carbon quantum dot-cofe-like Prussian blue nanocomposite material and its preparation method and application
  • A carbon quantum dot-cofe-like Prussian blue nanocomposite material and its preparation method and application
  • A carbon quantum dot-cofe-like Prussian blue nanocomposite material and its preparation method and application

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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-like Prussian blue nanocomposite material and a preparation method and application thereof, belonging to the technical field of electrode material preparation. The preparation method is a two-step synthesis method. Firstly, potassium citrate is used as the carbon source of carbon quantum dots, and the reaction conditions such as the amount of potassium citrate and the hydrothermal synthesis temperature and time are controlled, and the carbon quantum dot solution is prepared through the hydrothermal synthesis method; Then carbon quantum dots, inorganic cobalt salt and potassium ferricyanide are used as reaction raw materials, and a liquid-phase co-precipitation reaction method is used to prepare carbon quantum dots-CoFe-like Prussian blue composite materials with good dispersion. The size of the nanospheres is about 200‑400nm. When the carbon quantum dot-CoFe-like Prussian blue composite material prepared by the present invention is used as an electrode material, the capacity of the supercapacitor is improved, the fast charge and discharge capability of the supercapacitor is greatly improved, and it has excellent rate performance and long cycle 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 Patents(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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