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Method for preparing ultralight manganese dioxide aerogel

A manganese dioxide and aerogel technology, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of residual organic modified molecules, high porosity, high specific surface area, etc., and achieve the effect of simple equipment and mild conditions

Active Publication Date: 2016-01-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manganese dioxide airgel prepared by the present invention is formed by the self-assembly of δ crystal form-ultra-thin manganese dioxide nanosheets, has a definite crystal form and high purity, and solves the currently reported preparation of manganese dioxide airgel The method has the problem of manganese dioxide reactant precursor or organic modification molecules remaining; and the prepared airgel has high specific surface area, high porosity, ultra-light density (can be as low as 0.51mg / cm 3 ), much lower than the currently reported manganese dioxide aerogels, and is the first reported ultralight manganese dioxide aerogel

Method used

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  • Method for preparing ultralight manganese dioxide aerogel
  • Method for preparing ultralight manganese dioxide aerogel

Examples

Experimental program
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Embodiment 1

[0027] 1) Preparation of manganese dioxide nanosheets:

[0028] Dissolve 3.20mmol sodium lauryl sulfate in 32mL deionized water; then add 3.2mL of aqueous hydrochloric acid solution with a concentration of 100mM, 3.2mL of aqueous potassium permanganate solution with a concentration of 50mM and 281.6mL of deionized water; after mixing evenly Heated at 95°C for 3 hours to obtain dark brown precipitates of manganese dioxide nanosheets with a mass of ~12.5 mg;

[0029] 2) Preparation of ultrathin manganese dioxide nanosheet colloidal solution:

[0030] The manganese dioxide nanosheet precipitate prepared in step 1) was repeatedly washed with ethanol and deionized water for 3 times for purification, then 12.5 mL of deionized water was added to the precipitate, and the mixed solution was ultrasonicated for 30 minutes to obtain a brown supernatant. Colloidal solution of thin manganese dioxide nanosheets, the concentration is ~1.0mg / mL;

[0031] 3) Preparation of ultra-light mangane...

Embodiment 2

[0037] As in the steps of Example 1, the difference is that in step 2) of Example 1, the precipitated manganese dioxide nanosheets were rinsed repeatedly with ethanol and deionized water for 3 times, then 12.5 mL of deionized water was added, and the mixed solution was then ultrasonically In 30 minutes, a tan ultrathin manganese dioxide nanosheet colloidal solution was obtained, and the concentration was ~1mg / mL; while the volume of deionized water added in Example 2 was 25mL, and then the mixed solution was ultrasonicated for 30 minutes to obtain a tan ultrathin Colloidal solution of manganese dioxide nanosheets, the concentration is ~ 0.50mg / mL; further use the same method to prepare manganese dioxide airgel. The prepared manganese dioxide airgel is cylindrical with a volume of 3.3 cm 3 , with a mass of 1.7mg and a density of 0.51mg / cm 3 .

[0038] attached Figure 4 It is a scanning electron micrograph of the manganese dioxide airgel obtained in this example. As shown i...

Embodiment 3

[0040] As in the steps of Example 1, the difference is that in step 2) of Example 1, the precipitated manganese dioxide nanosheets were rinsed repeatedly with ethanol and deionized water for 3 times, then 12.5 mL of deionized water was added, and the mixed solution was then ultrasonically In 30 minutes, a tan ultrathin manganese dioxide nanosheet colloidal solution was obtained, and the concentration was ~1mg / mL; while the volume of deionized water added in Example 3 was 5mL, and then the mixed solution was ultrasonicated for 30 minutes to obtain a tan ultrathin Manganese dioxide nanosheet colloidal solution, the concentration is ~ 2.5mg / mL; further use the same method to prepare manganese dioxide airgel. The prepared manganese dioxide airgel is cylindrical with a volume of 3.3 cm 3 , with a mass of 8.3mg and a density of 2.5mg / cm 3 .

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Abstract

The invention belongs to the technical field of aerogel and specifically relates to a method for preparing ultralight manganese dioxide aerogel by self-assembly of ice template-mediated ultrathin nanoflakes. Beginning with preparation of an ultrathin manganese dioxide nanoflakes colloidal solution, by the utilization of self-assembly of ice crystal template effect-mediated nanoflakes during refrigeration and through the vacuum freeze-drying process, the ultralight manganese dioxide aerogel is conveniently and quickly prepared. The aerogel shows a microscopic three-dimensional porous structure, average pore size of pores is 45-60 microns, average length of a pore wall skeleton structure is 35-60 microns, and average diameter is 2.0-3.0 microns. Density of the prepared manganese dioxide aerogel can be as low as 0.51 mg / cm<3>. The manganese dioxide aerogel is ultralight (density is less than 1 mg / cm<3>) manganese dioxide aerogel reported for the first time. In addition, the aerogel has high purity and high crystallinity and can be widely applied in fields of cell, sensing, catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of manganese dioxide airgel preparation, and in particular relates to a method for preparing ultralight manganese dioxide airgel by inducing the self-assembly of ultrathin nanosheets through an ice template. The prepared ultra-light manganese dioxide airgel can be widely used in batteries, sensing, catalysis and other fields. Background technique [0002] As a transition metal oxide, manganese dioxide has variable oxidation valence, has the characteristics of abundant resources, low price, environmental friendliness, wide operating voltage window, and good electrochemical performance. It has always been the darling in the field of electrode materials. It is the most important use of manganese dioxide. In addition, manganese dioxide has ion exchange and molecular adsorption properties, and has shown broad prospects in the fields of molecular sieves and catalyst materials, and has received extensive attention...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 孙航许孔亮刘镇宁佘萍曾珊何沁容
Owner JILIN UNIV
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