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Two-dimensional mofs nanosheet-derived full-electrode materials for hybrid capacitors

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: 2021-05-18
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 full-electrode materials for hybrid capacitors
  • Two-dimensional mofs nanosheet-derived full-electrode materials for hybrid capacitors
  • Two-dimensional mofs nanosheet-derived full-electrode materials for hybrid capacitors

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Effect test

Embodiment 1

[0045] Preparation of hybrid capacitor cathode materials 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 at a molar ratio of 1:1 ) and nickel acetate in a molar ratio of 3:2 were added to 20mL of water / ethanol mixed solvent (the volume ratio of water to ethanol was 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 reaction for 60 minutes, centrifugation, ethanol cleaning 3-5 times, not only can the filter cake be better dispersed by ethanol washing, but also It is easier to dry to obtain powder materials, and the obtained powder materials are not easy to bond. Dry at 80°C for 12 hours to obtain two-dimensional MOFs nanosheet materials. The scanning electron microscope (SEM) map of the two-...

Embodiment 2

[0054] Preparation of hybrid capacitor cathode materials 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 at a molar ratio of 1:1 ) and nickel acetate at a molar ratio of 2:1 were added to 30mL of water / ethanol mixed solvent (the volume ratio of water to ethanol was 1:1), and added dropwise to 10mL of 0.008g / mL polyvinylpyrrolidone (PVP) aqueous solution, wherein , the mass ratio of nickel acetate to polyvinylpyrrolidone is 1:5; first ultrasonic for 30 minutes, then stirred for 60 minutes, then centrifuged, washed with ethanol for 3–5 times, and dried at 60°C for 10 hours to obtain a two-dimensional MOFs nanosheet material.

[0056] Weigh 200 mg of MOFs nanosheet material, grind it into fine powder with an agate mortar, spread it evenly in a corundum crucible, place it in a tube furnace, and raise the temperature from room temperature to 850 °C at a he...

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Abstract

The invention discloses a hybrid capacitor full electrode material derived from two-dimensional MOFs nanosheets, including a positive electrode material and a negative electrode material; the positive electrode material is prepared by the following method: 3-amino-1,2,4-triazole-5 carboxylic acid Potassium and nickel acetate are added to a water / ethanol mixed solvent, added dropwise to an aqueous solution of polyvinylpyrrolidone, ultrasonically dispersed, then stirred for reaction, centrifuged, washed with ethanol, and dried to obtain a two-dimensional MOFs nanosheet material, which is ground into a fine powder , calcined to obtain a powder sample; the negative electrode material is prepared by the following method: treat the positive electrode material with hydrochloric acid until the green color produced by the reaction disappears, wash with distilled water until the suspension is colorless, filter, and dry to obtain the powder material. The invention also discloses a battery-supercapacitor hybrid device made of positive and negative electrode materials. The hybrid capacitor exhibits high specific capacitance, excellent coulombic efficiency, good cycle performance and other practical potentials.

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 more than double the current level. In the face of this severe situation, nano, materials, chemistry and other disciplines 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 become an important strategy for the development of various countries. [0003] A battery-supercapacitor hybrid energy storage device generally refers to a hybrid energy storage device assembled with a battery-type electrode material as the positive electrode and a supercapacitor electrod...

Claims

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Application Information

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Patent Type & Authority Patents(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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