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Preparation method of MnO2/NiO binary composite material with core-shell structure

A composite material and hexahydrate technology, which is applied in the field of preparation of "core-shell" structure MnO2/NiO binary composite materials, can solve problems such as difficult separation, achieve low cost, improve structural stability, and increase specific surface area.

Active Publication Date: 2021-07-30
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, about the "core-shell" heterostructure MnO 2 / NiO composites are mostly deposited directly on foamed nickel, such as the MnO prepared by Yang Jinlin et al. 2 Nano-mesoporous foam grows on both sides of NiO nanosheets, forming a core-shell composite structure with NiO, MnO 2 / NiO hierarchical nanosheet array composites have some improvements in performance, but this method can only obtain a very small amount (only about 2.50 mg) of MnO 2 / NiO composite material, and attached to nickel foam, not easy to separate

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  • Preparation method of MnO2/NiO binary composite material with core-shell structure
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  • Preparation method of MnO2/NiO binary composite material with core-shell structure

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preparation example Construction

[0028] A "core-shell" structure of MnO 2 / NiO binary composite material preparation method, including hexahydrate nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), urea (CO(NH) 2 ) 2 ), polyvinylpyrrolidone (PVP) and potassium permanganate (KMnO 4 ), the preparation method comprises the following steps:

[0029](1) Preparation of pom-pom NiO: weigh PVP and Ni(NO) 3 ) 2 ·6H 2 O, added to deionized water, stirred to dissolve, ultrasonicated for 10-20 minutes to make it evenly dispersed, weighed CO (NH 2 ) 2 , add deionized water, stir to dissolve, ultrasonically disperse for 10-20 minutes, mix the two sets of solutions, ultrasonically disperse for 10-20 minutes, pour into a polytetrafluoroethylene reactor at 100-120 ℃, react for 10-14 hours, After cooling to room temperature, the product was repeatedly filtered and washed with absolute ethanol and deionized water. After washing, vacuum freeze-dried to obtain a green precursor. The green precursor was heat-treated at 275-500 °C for...

Embodiment 1

[0035] A "core-shell" structure MnO of this embodiment 2 / NiO binary composite material preparation method, including hexahydrate nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), urea (CO(NH) 2 ) 2 ), polyvinylpyrrolidone (PVP) and potassium permanganate (KMnO 4 ), the preparation method comprises the following steps:

[0036] (1) Preparation of pom-pom NiO: weigh 0.75 g of PVP and 1.80 g of Ni (NO 3 ) 2 ·6H 2 O, added to 40 ml of deionized water, stirred to dissolve, ultrasonicated for 10 minutes to make it evenly dispersed, weighed 0.90 g of CO (NH 2 ) 2 , add 30 ml of deionized water, stir to dissolve, ultrasonically disperse for 10 minutes, mix the two sets of solutions, and ultrasonically disperse for 10 minutes, pour into a polytetrafluoroethylene reactor at 100 °C, react for 12 hours, cool to room temperature, and use Absolute ethanol and deionized water were repeatedly filtered and washed, washed and then vacuum freeze-dried to obtain a green precursor. The green precur...

Embodiment 2

[0040] A "core-shell" structure MnO of this embodiment 2 / NiO binary composite material preparation method, including hexahydrate nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O), urea (CO(NH) 2 ) 2 ), polyvinylpyrrolidone (PVP) and potassium permanganate (KMnO 4 ), the preparation method comprises the following steps:

[0041] (1) Preparation of pom-pom NiO: weigh 1.50 g of PVP and 0.90 g of Ni (NO 3 ) 2 ·6H 2 O, added to 40 ml of deionized water, stirred to dissolve, ultrasonicated for 10 minutes to make it evenly dispersed, weighed 0.90 g of CO (NH 2 ) 2 , add 30 ml of deionized water, stir to dissolve, ultrasonically disperse for 10 minutes, mix the two sets of solutions, and ultrasonically disperse for 10 minutes, pour into a polytetrafluoroethylene reactor at 100 °C, react for 12 hours, cool to room temperature, and use Absolute ethanol and deionized water were repeatedly filtered and washed, washed and then vacuum freeze-dried to obtain a green precursor. The green precur...

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Abstract

The invention relates to the technical field of energy storage, in particular to a preparation method of a MnO2 / NiO binary composite material with a core-shell structure. The preparation method comprises preparation of pompon NiO. The preparation process of the pompon NiO comprises the steps of weighing a proper amount of polyvinylpyrrolidone and nickel nitrate hexahydrate, adding the polyvinylpyrrolidone and the nickel nitrate hexahydrate into deionized water, weighing urea which is in a certain proportion with the nickel nitrate hexahydrate, adding deionized water, respectively stirring and dissolving, carrying out ultrasonic treatment, mixing two groups of solutions, carrying out ultrasonic dispersion, pouring into a polytetrafluoroethylene reaction kettle at the temperature of 100-120 DEG C, reacting for 10-14 hours, cooling to room temperature, repeatedly carrying out suction filtration and washing on a product by using absolute ethyl alcohol and deionized water, carrying out vacuum freeze drying after cleaning to obtain a green precursor, and carrying out heat treatment on the green precursor in an air atmosphere at the temperature of 275-500 DEG C for 2-10 hours to obtain black pompon NiO. The MnO2 / NiO binary composite electrode with the core-shell structure has relatively high specific capacitance in an alkaline electrolyte, and the specific capacitance reaches 627 F / g under the current density of 0.5 A / g.

Description

technical field [0001] The invention belongs to the technical field of nano-composite materials and energy storage materials, and in particular relates to a "core-shell" structure MnO 2 / NiO binary composite material preparation method. Background technique [0002] Supercapacitors combine the advantages of traditional capacitors and ordinary rechargeable batteries, including high power density, fast charge and discharge, and long life, while maintaining stable performance and no pollution to the environment. According to the energy storage mechanism, supercapacitors can be divided into electric double layer capacitors and pseudocapacitors. Electrode materials are the key to affecting the application performance of supercapacitors. Electric double-layer supercapacitors often use carbon materials as electrode materials, and pseudocapacitors often use conductive polymers, transition metal oxides, etc. as electrode materials. Numerous studies have shown that MnO 2 As a typi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G45/02H01G11/46H01G11/24H01G11/86
CPCC01G53/04C01G45/02H01G11/46H01G11/24H01G11/86C01P2004/84C01P2006/40C01P2004/32C01P2004/01Y02E60/13
Inventor 侯朝霞王晓慧李思瑶王凯潘秀梅王书哲刘英昊
Owner SHENYANG UNIV