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Two-dimensional MOFs nanosheet derived hybrid capacitor full-electrode material

A technology for hybrid capacitors and electrode materials, applied in the directions of hybrid capacitor electrodes, hybrid capacitors, capacitors, etc., can solve the problems of increased redox activity, surface defects, easily damaged structure, low content of heteroatoms, etc., and achieves good commercial value. The effect of outstanding chemical properties and high nitrogen atom content

Active Publication Date: 2020-04-24
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nitrogen atom-modified carbon materials can increase the redox activity of the surface, increase surface defects, and improve the wettability of materials to improve electrochemical performance. Compared with the composite metal oxide / hydroxide method to improve the capacitance, the hybrid The chemicalization method has higher uniformity and better controllability, but the structure is easily damaged, the content of heteroatoms is low, and the functionality is poor

Method used

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  • Two-dimensional MOFs nanosheet derived hybrid capacitor full-electrode material
  • Two-dimensional MOFs nanosheet derived hybrid capacitor full-electrode material
  • Two-dimensional MOFs nanosheet derived hybrid capacitor full-electrode material

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Embodiment 1

[0045] Preparation of cathode materials for hybrid capacitors derived from two-dimensional MOFs nanosheets:

[0046] Prepare potassium 3-amino-1,2,4-triazole-5 carboxylate (3-amino-1,2,4-triazole-5-carboxylic acid and potassium hydroxide in a molar ratio of 1:1 ) And nickel acetate are added in a molar ratio of 3:2 to 20mL of water / ethanol mixed solvent (the volume ratio of water to ethanol is 1:1), and then added dropwise to 10mL of 0.012g / mL polyvinylpyrrolidone (PVP) aqueous solution, Among them, the mass ratio of nickel acetate to PVP is 1:3; first ultrasonic dispersion for 10 minutes, then stirring for 60 minutes, centrifugation, ethanol washing 3-5 times, ethanol washing can not only make the filter cake better dispersion, but also It is easier to dry to obtain a powder material, and the obtained powder material is not easy to bond, and dried at 80°C for 12 hours to obtain a two-dimensional MOFs nanosheet material. The scanning electron microscope (SEM) spectrum of the two...

Embodiment 2

[0054] Preparation of cathode materials for hybrid capacitors derived from two-dimensional MOFs nanosheets:

[0055] Prepare potassium 3-amino-1,2,4-triazole-5 carboxylate (3-amino-1,2,4-triazole-5-carboxylic acid and potassium hydroxide in a molar ratio of 1:1 ) And nickel acetate at a molar ratio of 2:1 to 30mL of water / ethanol mixed solvent (the volume ratio of water to ethanol is 1:1), and add dropwise to 10mL of 0.008g / mL polyvinylpyrrolidone (PVP) aqueous solution. , The mass ratio of nickel acetate to polyvinylpyrrolidone is 1:5; first ultrasonic for 30 minutes, then stirring for 60 minutes, then centrifugation, washing with ethanol 3–5 times, and drying at 60°C for 10 hours to obtain two-dimensional MOFs nanosheet materials.

[0056] Weigh 200 mg of MOFs nano-sheet material, grind it into a fine powder with an agate mortar, spread it evenly in a corundum crucible, place it in a tube furnace, and heat it up from room temperature to 850°C at a heating rate of 3°C / min, at a te...

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Abstract

The invention discloses a two-dimensional MOFs nanosheet derived hybrid capacitor full-electrode material. The full-electrode material comprises a positive electrode material and a negative electrodematerial. The positive electrode material is prepared by the following method: adding 3-amino-1, 2, 4-triazole-5 potassium carboxylate and nickel acetate into a water / ethanol mixed solvent, dropwise adding the obtained solution into a polyvinylpyrrolidone aqueous solution, performing ultrasonic dispersion, performing stirring reaction, performing centrifuging, ethanol cleaning and drying to obtaina two-dimensional MOFs nanosheet layer material, grinding the material into fine powder, and calcining the fine powder to obtain a powder sample. The negative electrode material is prepared by the following method: treating the positive electrode material with hydrochloric acid until green generated by reaction disappears, washing the material with distilled water until a suspension is colorless,and performing filtering and drying to obtain a powder material. The invention further discloses a battery-supercapacitor hybrid device made of the positive electrode material and the negative electrode material. The hybrid capacitor has the practical potential of being high in specific capacitance, excellent in coulombic efficiency, good in cycle performance and the like.

Description

Technical field [0001] The invention belongs to the technical field of battery-supercapacitor hybrid energy storage, and relates to a hybrid capacitor full electrode material derived from two-dimensional MOFs nanosheets. Background technique [0002] By the middle of the 21st century, people's demand for energy will be more than twice the current level. Faced with this severe situation, disciplines such as nanotechnology, materials, and chemistry must explore and develop new energy materials to meet the increasing demand for energy storage and conversion. Therefore, the development and research of new energy materials is the core and foundation of effective energy storage and conversion, and has now risen to an important strategy for the development of various countries. [0003] The battery-supercapacitor hybrid energy storage device generally refers to a hybrid energy storage device assembled with battery electrode material as the positive electrode and supercapacitor electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/44H01G11/24H01G11/04C01B32/205C01G53/04B22F1/00B22F9/20
CPCH01G11/30H01G11/32H01G11/44H01G11/24H01G11/04C01B32/205C01G53/04B22F9/20C01P2004/80C01P2004/03C01P2002/72C01P2002/85C01P2006/40B22F1/07B22F1/054Y02E60/13
Inventor 汪快兵吴华王子恺王徽健
Owner NANJING AGRICULTURAL UNIVERSITY
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