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Method for synthesizing monolayer manganese dioxide nanosheet by one step

A technology of manganese dioxide and nanosheets, applied in the direction of manganese oxide/manganese hydroxide, nanotechnology, nanotechnology, etc., can solve the problem of lack of capacitance properties of single-layer manganese dioxide, it is difficult to obtain single-layer manganese dioxide nanosheets, Measured value is small and other problems, to achieve excellent oxidation-reduction performance, promote diffusion and electron transfer, the effect of mild conditions

Inactive Publication Date: 2015-01-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The manganese dioxide electrode material obtains Faraday capacitance (ie, pseudocapacitance) through a fast and reversible redox reaction. According to the Faraday principle, the theoretical capacitance value of manganese dioxide is as high as 1370F / g, but the actual measured value is much smaller than the theoretical value.
However, the positively charged TMA in the colloidal solution is adsorbed on the surface of the electronegative manganese dioxide nanosheets through electrostatic interaction, and the removal of TMA will lead to the aggregation of the monolayer manganese dioxide nanosheets, and it is difficult to obtain alkali metal ions or protons as a counterweight Ionic monolayer manganese dioxide nanosheets
However, there is no relevant report on the capacitive properties of single-layer manganese dioxide.

Method used

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  • Method for synthesizing monolayer manganese dioxide nanosheet by one step
  • Method for synthesizing monolayer manganese dioxide nanosheet by one step
  • Method for synthesizing monolayer manganese dioxide nanosheet by one step

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 3.20 mmol of sodium lauryl sulfate in 300 mL of deionized water, and adjust the pH of the solution to 3 with sulfuric acid. The mixed solution was heated at 95° C. for 15 minutes, then 3.2 mL of potassium permanganate aqueous solution with a concentration of 50 mM was added, and the heating was continued at 95° C. for 1 hour to obtain a tan single-layer manganese dioxide nanosheet colloidal solution.

[0025] After centrifuging the prepared single-layer manganese dioxide nanosheet colloidal solution at a speed of 14000 rpm for 10 minutes, the lower layer of precipitate was removed, and the precipitate was repeatedly washed with ethanol and deionized water for three times to purify the sample. The purified sample was freeze-dried at -50°C for 10 hours to obtain a single-layer manganese dioxide nanosheet solid. The nanosheets have a thickness of 0.95nm and an average width of 200nm.

[0026] Embodiment 1 performance test

[0027]Mix the single-layer manganese d...

Embodiment 2

[0034] Dissolve 0.16 mmol of sodium lauryl sulfate in 300 mL of deionized water, and adjust the pH of the solution to 3 with sulfuric acid. The mixed solution was heated at 95° C. for 30 minutes, then 3.2 mL of potassium permanganate aqueous solution with a concentration of 50 mM was added, and the heating was continued at 95° C. for 3 hours to obtain a tan single-layer manganese dioxide nanosheet colloidal solution.

[0035] After centrifuging the prepared single-layer manganese dioxide nanosheet colloidal solution at a speed of 14000 rpm for 10 minutes, the lower layer of precipitate was removed, and the precipitate was repeatedly washed with ethanol and deionized water for three times to purify the sample. The purified sample was freeze-dried at -50°C for 5 hours to obtain a single-layer manganese dioxide nanosheet solid. The nanosheets have a thickness of 0.9nm and an average width of 500nm.

Embodiment 3

[0037] Dissolve 1.60 mmol of sodium lauryl sulfate in 300 mL of deionized water, and adjust the pH of the solution to 2 with sulfuric acid. The mixed solution was heated at 95° C. for 15 minutes, then 3.2 mL of potassium permanganate aqueous solution with a concentration of 50 mM was added, and the heating was continued at 95° C. for 1 hour to obtain a tan single-layer manganese dioxide nanosheet colloidal solution.

[0038] After centrifuging the prepared single-layer manganese dioxide nanosheet colloidal solution at a speed of 14000 rpm for 10 minutes, the lower layer of precipitate was removed, and the precipitate was repeatedly washed with ethanol and deionized water for three times to purify the sample. The purified sample was freeze-dried at -50°C for 10 hours to obtain a single-layer manganese dioxide nanosheet solid. The nanosheets have a thickness of 0.7nm and an average width of 150nm.

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Abstract

The invention relates to a method for synthesizing monolayer manganese dioxide nanosheet by one step, belonging to the technical field of controllable synthesis and appearance control of transition metal oxide nano materials. According to the method, hypermanganate is subjected to in-situ reduction through one step reaction of hypermanganate in acid alkyl sulfate surfactant water solution and utilizing corresponding alcohol generated by hydrolyzing the alkyl sulfate surfactant to produce manganese dioxide. Compared with the method in which the reducing agent alcohol is directly added, according to the method, the generation speed of manganese dioxide is effectively controlled through hydrolysis of the surfactant step by step, and the surfactant is also used as a structural induction reagent, so that the monolayer manganese dioxide nanosheet is prepared by one step. The prepared monolayer manganese dioxide nanosheet has excellent electrochemical capacitive performance, and can be widely used in the fields of batteries, sensing, catalysis and the like.

Description

technical field [0001] The invention belongs to the technical field of controllable synthesis and shape control of transition metal oxide nanomaterials, and specifically relates to a method for synthesizing single-layer manganese dioxide nanosheets in one step. The prepared single-layer manganese dioxide nanosheets exhibit excellent electrochemical capacitive performance, and 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 advantages of low price, environmental friendliness, and wide source. It is an important electrode active material and a catalyst and oxidant for redox reactions. It has been widely used in recent years focus on. Manganese dioxide can exhibit good capacitive properties in a neutral aqueous electrolyte and a wide potential window, making it expected to become a pseudocapacitive electrode material with great practical an...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82Y30/00B82Y40/00
CPCC01G45/02C01P2002/72C01P2004/03C01P2004/20C01P2004/61C01P2004/62
Inventor 孙航刘镇宁许孔亮尹升燕
Owner JILIN UNIV
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