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Method for synthesizing alpha-MnO2 micrometre hollow sphere and nanocluster

A technology of nano-clusters and hollow spheres, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of long reaction time, and achieve the effect of mild reaction conditions and simple process

Inactive Publication Date: 2009-02-25
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xie's group is using potassium persulfate to oxidize manganese sulfate to prepare α-MnO 2 Catalysts are used in the process of micron hollow spheres, and the reaction time is longer (1-2 days)

Method used

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  • Method for synthesizing alpha-MnO2 micrometre hollow sphere and nanocluster
  • Method for synthesizing alpha-MnO2 micrometre hollow sphere and nanocluster
  • Method for synthesizing alpha-MnO2 micrometre hollow sphere and nanocluster

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 99.5% potassium persulfate according to the stoichiometric ratio of 1:1, which is analytically pure; 99% manganese sulfate monohydrate, which is analytically pure; add the above raw materials into the hydrothermal reaction kettle, add deionized water and stir fully to make dissolve it; measure 2 mL of concentrated sulfuric acid with a mass fraction of 95-98% and add it to a hydrothermal reaction kettle. At the beginning of the reaction, the concentration of sulfuric acid was 1mol / L, and the concentration of potassium persulfate and manganese sulfate was 0.05mol / L. The hydrothermal reaction vessel was placed in an oven at a constant temperature of 110° C. for 6 h, and then cooled to room temperature naturally. After the reaction product was centrifuged and washed 5 times with deionized water and absolute ethanol, it was checked that it did not contain SO 4 2- After drying at 60°C in the air atmosphere, the obtained product is α-MnO 2 micron hollow spheres. figu...

Embodiment 2

[0024] Weigh 99.5% potassium persulfate according to the stoichiometric ratio of 1:1, which is analytically pure; 99% manganese sulfate monohydrate, which is analytically pure; add the above raw materials into the hydrothermal reaction kettle, add deionized water and stir fully to make dissolve it; measure 2 mL of concentrated sulfuric acid with a mass fraction of 95-98% and add it to a hydrothermal reaction kettle. At the beginning of the reaction, the concentration of sulfuric acid was 1mol / L, and the concentration of potassium persulfate and manganese sulfate was 0.05mol / L. The hydrothermal reaction vessel was placed in an oven at a constant temperature of 110°C for an hour and then naturally cooled to room temperature. After the reaction product was centrifuged and washed 5 times with deionized water and absolute ethanol, it was checked that it did not contain SO 4 2- After drying at 60°C in the air atmosphere, the obtained product is α-MnO 2 micron hollow spheres.

Embodiment 3

[0026] Weigh 99.5% potassium persulfate according to the stoichiometric ratio of 1:1, which is analytically pure; 99% manganese sulfate monohydrate, which is analytically pure; add the above raw materials into the hydrothermal reaction kettle, add deionized water and stir fully to make dissolve it; measure 2 mL of concentrated sulfuric acid with a mass fraction of 95-98% and add it to a hydrothermal reaction kettle. At the beginning of the reaction, the concentration of sulfuric acid was 1mol / L, and the concentration of potassium persulfate and manganese sulfate was 0.05mol / L. The hydrothermal reaction kettle was placed in an oven at a constant temperature of 110°C for 12 hours, and then cooled to room temperature naturally. After the reaction product was centrifuged and washed 5 times with deionized water and absolute ethanol, it was checked that it did not contain SO 4 2- After drying at 60°C in the air atmosphere, the obtained product is α-MnO 2 micron hollow spheres.

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Abstract

The invention relates to a method for synthesizing alpha-Mn02 micron hollow spheres and nano-clusters, which comprises the following steps: potassium persulfate, manganese sulfate and concentrated sulfuric acid are added to a hydrothermal reaction kettle, added with deionized water and fully stirred to obtain a mixture, hydrothermal reaction is carried out on the mixture at the temperature of 110-140 DEG C for 1-2h, then the mixture naturally cools to room temperature. The obtained product is washed and dried to obtain the alpha-MnO2 micron hollow spheres; when aluminum nitrate is added to the raw materials, with the same steps, the obtained product is alpha-MnO2 star-shaped nano-clusters. The method has the advantages of simple technological process, mild reaction conditions and low production cost. The manganese dioxide material is used for molecular sieves, taken as the electrode materials of zinc-manganese batteries, lithium ion secondary batteries and the electrode materials of electrochemical super capacitors, and taken as a catalyst to be used in the fields of environmental protection and catalysis.

Description

technical field [0001] The present invention relates to α-MnO 2 The preparation technology, especially relates to the preparation method of micron hollow spheres and nano clusters. Background technique [0002] Materials with hollow structures have attracted extensive attention and research in recent years, and they can be used as catalysts, drug carriers, environmental engineering and sensors. Manganese dioxide is used as an electrode material for secondary lithium-ion batteries and supercapacitors in recent years due to its environmental friendliness, simple preparation process, and cheap and easy-to-obtain raw materials. Xie's group first used AgNO 3 As a catalyst, α-MnO was prepared by oxidizing manganese sulfate with potassium persulfate at room temperature 2 Micron hollow spheres. [Z.Q.Li, Y.Ding, Y.J.Xiong, Q.Yang and Y.Xie, Chem.Commun., 2005, 918.], later prepared sea urchin-like hollow α by reducing potassium permanganate with metal copper -MnO 2 microsphere ...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 余鹏张熊王栋樑王雷马衍伟
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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