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A kind of preparation method of three-dimensional manganese dioxide airgel

A technology of manganese dioxide and aerogels, which is applied in chemical instruments and methods, manganese oxide/manganese hydroxide, metal/metal oxide/metal hydroxide catalysts, etc., can solve the limitation of manganese dioxide aerogels widely application, crystal form of manganese dioxide cannot be controlled, and organically modified molecules remain, so as to achieve the effects of easy scale-up experiment, improvement of poor conductivity, and improvement of electrocatalytic performance

Active Publication Date: 2020-05-05
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The airgel prepared by the above method has the disadvantages of manganese precursor and organic modification molecule residues, uncontrollable crystal form of manganese dioxide, complicated preparation method, and incapable of scale-up production, which limit the wide application of manganese dioxide airgel.

Method used

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  • A kind of preparation method of three-dimensional manganese dioxide airgel
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  • A kind of preparation method of three-dimensional manganese dioxide airgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The formula for adding manganese dioxide nanowires to the lining of a 100mL capacity hydrothermal kettle: after adding 3.38g of manganese (II), 4.69g of ammonium persulfate and 10.58g of ammonium sulfate, add 70mL of ultrapure water to dissolve, and prepare Form solution A, the molar ratio of manganese sulfate (II): ammonium persulfate: ammonium sulfate is 1:1:4. Stir solution A for 15 minutes until it becomes clear, then add 0.03 g of silver nitrate and stir vigorously to form solution B, which is a black suspension. After sealing the hydrothermal kettle where the solution B was located, it was placed in an oven to react at 140°C for 14 hours, and the hydrothermal reaction was carried out to obtain block solid C. After the hydrothermal kettle was cooled to room temperature, the solid C was taken out from the hydrothermal kettle and soaked in deionized water. During this period, the water was changed continuously. When the pH=7, freeze-dried to obtain 1.75g ​​of airgel ...

Embodiment 2

[0057] The formula for adding manganese dioxide nanowires to the lining of a 100mL capacity hydrothermal kettle: after adding 3.38g of manganese (II), 4.69g of ammonium persulfate and 10.58g of ammonium sulfate, add 70mL of ultrapure water to dissolve, and prepare Form solution A, the molar ratio of manganese sulfate (II): ammonium persulfate: ammonium sulfate is 1:1:4. Stir solution A for 15min until clear, add 0.305g AgNO 3 , after vigorous stirring, it was made into solution B, and solution B was a black suspension. After sealing the hydrothermal kettle where the solution B was located, it was placed in an oven to react at 140°C for 14 hours, and the hydrothermal reaction was carried out to obtain block solid C. After the hydrothermal kettle was cooled to room temperature, the solid C was taken out from the hydrothermal kettle and soaked in deionized water. During this period, the water was changed continuously. When the pH=7, it was freeze-dried to obtain 1.91g of airgel ...

Embodiment 3

[0062] The formula for adding manganese dioxide nanowires to the lining of a 100mL capacity hydrothermal kettle: after adding 3.38g of manganese (II), 4.69g of ammonium persulfate and 10.58g of ammonium sulfate, add 70mL of ultrapure water to dissolve, and prepare Form solution A, the molar ratio of manganese sulfate (II): ammonium persulfate: ammonium sulfate is 1:1:4. Stir solution A for 15min until clear, then add 0.68g AgNO 3 , after vigorous stirring, it was made into solution B, and solution B was a black suspension. After sealing the hydrothermal kettle where the solution B was located, it was placed in an oven to react at 140°C for 14 hours, and the hydrothermal reaction was carried out to obtain block solid C. After the hydrothermal kettle was cooled to room temperature, the solid C was taken out from the hydrothermal kettle and soaked in deionized water. During this period, the water was changed continuously. When the pH was 7, freeze-dried to obtain 2.1 g of airgel...

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Abstract

The invention provides a preparation method for a three-dimensional manganese dioxide aerogel, belonging to the field of preparation of catalysts. The three-dimensional manganese dioxide aerogel is doped with elemental silver and has a general chemical formula of Ag-MnO2, wherein the addition amount of the elemental silver, in terms of the total mass of silver doping the manganese dioxide aerogel, is greater than 0 and no more than 50% by mass. The invention further provides a preparation method for the three-dimensional manganese dioxide aerogel. The three-dimensional manganese dioxide aerogel prepared by using the preparation method has the advantages of no residues of a manganese precursor and organic modification molecules, high mechanical strength, large specific surface area and good electrical conductivity; and the preparation method is simple and easy to realize scale-up experiments, so aerogel with a greater size can be prepared and high electrocatalytic activity is obtained.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and relates to a preparation method of a three-dimensional manganese dioxide airgel. Background technique [0002] Due to its unique nanoporous structure, airgel has unique advantages in optics and mechanics, such as high porosity, high specific surface area, low density, and strong adsorption properties. With the deepening of research, the potential value of aerogels has been gradually discovered, and it is currently used in the main fields of thermal, catalysis and electronics, and can be used as heat insulation materials, lithium batteries, catalysts and catalyst carriers, etc. [0003] The traditional airgel preparation methods are sol-gel method and template-directed method. The sol-gel method can be synthesized in batches, but it is not suitable for control; the template-directed method can generate ordered structures, but it is too dependent on the structure of the template and cannot b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02H01M4/90H01M4/88B01J23/68
CPCB01J23/688B01J35/0013C01G45/02C01P2002/72C01P2004/01C01P2004/03C01P2006/12C01P2006/40H01M4/88H01M4/9016Y02E60/50
Inventor 张豪杰林超杜福平胡赏李小鹏孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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