High-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as preparation method and application thereof

A supercapacitor electrode, Prussian blue-like technology, applied in hybrid capacitor electrodes, nanotechnology for materials and surface science, hybrid/electric double layer capacitor manufacturing, etc., can solve the problem of less research, less than ideal rate performance, relatively Problems such as low capacity and rate performance, to achieve simple process, improve fast charge and discharge and service life, and increase capacity

Inactive Publication Date: 2017-10-17
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of Prussian blue-like compounds as cathode materials for supercapacitors has been less studied
Chen Jie et al [1] obtained Prussian blue derivatives through a simple chemical co-precipitation method and applied them to supercapacitor materials. When the current is 0.2A / g, Ni 2 [Fe(CN) 6 ] has a high specific capacity of 450F / g, but its rate performance is not ideal
co 2 [Fe(CN) 6 ] have also been synthesized, but their specific capacity and rate performance are much lower than that of Ni 2 [Fe(CN) 6 ]

Method used

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  • High-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as preparation method and application thereof
  • High-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as preparation method and application thereof
  • High-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 0.143g cobalt chloride hexahydrate (0.6mmol) and 0.294g trisodium citrate (1mmol) to dissolve in 20mL deionized water to prepare a cobalt chloride solution, then weigh 0.132g potassium ferricyanide (0.4mmol) to dissolve Prepare a potassium ferricyanide solution in 20 mL of deionized water; slowly add the potassium ferricyanide solution dropwise into the cobalt chloride solution under stirring; leave it to age at room temperature for 24 hours, collect the sample by centrifugation, and wash with deionized water 3 times, tumble dry at 60°. From figure 1 , 2 Co-Fe-like Prussian blue nanocubes with a size of about 250nm can be seen.

[0029] The comparative example of embodiment 1 (without trisodium citrate)

[0030] Weigh 0.143g cobalt chloride hexahydrate (0.6mmol) and dissolve it in 20mL deionized water to prepare cobalt chloride solution, then weigh 0.132g potassium ferricyanide (0.4mmol) and dissolve it in 20mL deionized water to prepare ferricyanide Potassium...

Embodiment 2

[0034] Weigh 0.143g cobalt chloride hexahydrate (0.6mmol) and 0.294g trisodium citrate (1mmol) and dissolve in 20mL deionized water to prepare an inorganic cobalt salt solution, then weigh 0.132g potassium ferricyanide (0.8mmol) to dissolve Prepare a potassium ferricyanide solution in 20 mL of deionized water; slowly add the potassium ferricyanide solution dropwise into the inorganic cobalt salt solution under stirring; leave it to age for 24 hours at room temperature, collect the sample by centrifugation, and wash with deionized water 3 times, tumble dry at 60°. From Figure 5 Co-Fe-like Prussian blue nanocubes with a size of about 300 nm can be seen.

[0035] Application example of embodiment 2

[0036] The Co-Fe-like Prussian blue nano-cubic electrode was prepared according to the method described in the application example of Example 2 and its performance was tested. From Figure 6 , It can be measured that the capacitance value of the Co-Fe Prussian blue nano-cubic ele...

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Abstract

The invention relates to a high-performance super-capacitor electrode material Co-Fe type prussian blue nano cube as well as a preparation method and application thereof, and belongs to the technical field of electrode material preparation. According to the preparation method, inorganic cobalt salt and potassium ferricyanide are adopted as reaction raw materials, trisodium citrate is adopted as a complexing stabilizer, a liquid-phase precipitation reaction method is implemented, reaction conditions such as the use amount and the stand aging time of potassium ferricyanide are controlled, a Co-Fe type prussian blue nano cube material with good dispersibility and large specific area is prepared, and the size of the material is about 300nm. By adopting the Co-Fe type prussian blue nano cube material provided by the invention, the capacity of an electrochemical electric container is increased, properties such as the rapid charge and discharge property and the service life of the electric container are improved, the capacitance of the electric container is as high as 447F/g in constant current charge and discharge of 5A/g in a 1mol/L sodium sulfate solution, and the good rate capability is achieved.

Description

technical field [0001] The invention relates to a high-performance supercapacitor electrode material Co-Fe-like Prussian blue nano-cube and a preparation method and application thereof, belonging to the technical field of electrode material preparation. Background technique [0002] Prussian blue is a dark blue pigment, mainly used in paint, ink, plastics and other industries as well as the coloring of cultural and educational supplies. Since in the Prussian blue unit cell, ferrous ions and ferric ions occupy two different positions, and these two positions can be replaced by different other transition metals, so the types of Prussian blue-like compounds formed are diverse. sex. Prussian blue-like compounds can be used in chemical analysis and detection, medicine and other fields. Due to the large specific surface area, high porosity, and strong ion intercalation and detachment capabilities of the Prussian blue-like, it has excellent electrochemical performance when used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/12H01G11/24H01G11/30H01G11/86B82Y30/00
CPCY02E60/13C01C3/12B82Y30/00C01P2002/72C01P2004/03C01P2004/38C01P2004/51C01P2004/62C01P2004/82C01P2006/40H01G11/24H01G11/30H01G11/86
Inventor 宋朝霞刘伟孙囡翾魏文硕周泉
Owner DALIAN NATIONALITIES UNIVERSITY
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