Preparation method of monolayer manganese dioxide nano-plates

A technology of manganese dioxide and nanosheets, which is applied in the direction of manganese oxide/manganese hydroxide, electrical components, electrolytic capacitors, etc., can solve the problems of multi-layer materials and easy agglomeration, and achieve the effect of improving electrochemical performance

Inactive Publication Date: 2009-11-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, manganese dioxide nanomaterials are generally prepared by sol-gel method and electrodeposition method, and various manganese dioxide with different nanostructures can be obtained, such as nanorods, nanoflowers, etc., but the prepared materials are generally multi-layered. of, or easy reunion
There is no report on the preparation of single-layer manganese dioxide nanosheets

Method used

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  • Preparation method of monolayer manganese dioxide nano-plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Pour 100ml of 0.6M sodium hydroxide solution containing 3wt% hydrogen peroxide into 50ml of 0.3M manganese nitrate solution, stir for 30 minutes and let it stand for 5 hours, filter off the supernatant to obtain a precipitate, and wash it with deionized water.

[0026] Take 1 gram of the precipitate and put it into 100ml of 2M sodium hydroxide solution and stir for 5 minutes, then put it into an autoclave and heat it at 150° C. for 24 hours. After washing with deionized water and filtering to obtain the ordered layered structure of OH x MnO 2 .

[0027] put the obtained OH x MnO 2 Add it to 500ml of 0.1M hydrochloric acid solution and stir for 20 hours; filter the precipitate and add it to 500ml of 0.1M hydrochloric acid solution again and stir for 20 hours. Precipitate with a high-speed centrifuge to obtain H x MnO 2 .

[0028] Take 0.2 g H x MnO 2 Put into 50ml 0.2M tetrabutylammonium hydroxide solution and shake for 48 hours to obtain suspended single-shaped...

Embodiment 2

[0031] Pour 100ml of 0.6M sodium hydroxide solution containing 2wt% hydrogen peroxide into 50ml of 0.3M manganese nitrate solution, stir for 30 minutes and then let it stand for 5 hours, filter off the supernatant to obtain a precipitate, and wash it with deionized water.

[0032] Take 1 gram of the precipitate and put it into 100ml of 2M sodium hydroxide solution and stir for 5 minutes, then put it into an autoclave and heat it at 150° C. for 24 hours. After washing with deionized water and filtering to obtain the ordered layered structure of OH x MnO 2 .

[0033] put the obtained OHx MnO 2 Add it to 500ml of 0.1M hydrochloric acid solution and stir for 20 hours; filter the precipitate and add it to 500ml of 0.1M hydrochloric acid solution again and stir for 20 hours. Precipitate with a high-speed centrifuge to obtain H x MnO 2 .

[0034] Take 0.4 g H x MnO 2 Put into 50ml 0.2M tetramethylammonium hydroxide solution and shake for 48 hours to obtain suspended single-sh...

Embodiment 3

[0037] Pour 100ml of 0.6M sodium hydroxide solution containing 2wt% potassium permanganate into 50ml of 0.3M manganese nitrate solution, stir for 30 minutes and let it stand for 5 hours, filter the supernatant to obtain a precipitate, and wash it with deionized water .

[0038] Take 1 gram of the precipitate and put it into 100ml of 2M sodium hydroxide solution and stir for 5 minutes, then put it into an autoclave and heat it at 150° C. for 24 hours. After washing with deionized water and filtering to obtain the ordered layered structure of OH x MnO 2 .

[0039] put the obtained OH x MnO 2 Add it to 500ml of 0.1M hydrochloric acid solution and stir for 20 hours; filter the precipitate and add it to 500ml of 0.1M hydrochloric acid solution again and stir for 20 hours. Precipitate with a high-speed centrifuge to obtain H x MnO 2 .

[0040] Take 0.4 g H x MnO 2 Put into 50ml 0.2M tetramethylammonium hydroxide solution and shake for 48 hours to obtain suspended single-sh...

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Abstract

The invention discloses a preparation method of monolayer manganese dioxide nano-plates, including the following steps: (1) manganese nitrate is reacted with sodium hydroxide or potassium hydroxide with the existence of oxidant to produce NaxMnO2 or KxMnO2 having ordered laminated structure; (2) the NaxMnO2 or KxMnO2 having ordered laminate structure is added to sodium hydroxide aqueous solution, OHxMnO2 is obtained by hydro-thermal synthesis method, and the obtained OHxMnO2 is fully acid-cleaned to obtain HxMnO2; (3) tetrabutylammonium hydroxide or tetramethylammonium hydroxide is used for reacting with laminated HxMnO2, and the tetrabutylammonium hydroxide or tetramethylammonium hydroxide is inserted inside the laminated HxMnO2 so that the laminated HxMnO2 is dispersed into monolayer manganese dioxide nano-plates. The manganese dioxide nano-plates obtained in the invention have monolayer with the thickness of just 0.3 to 0.8 nm; and as electrode material, the chemical performance of manganese dioxide nano-plate electrode is obviously higher than that of carbon nanotube electrode.

Description

1. Technical field [0001] The invention relates to a preparation method of a transition metal oxide having a nanostructure for supercapacitor electrodes, electrochromic materials and organic electrosynthesis electrodes, in particular to a preparation method of a single-layer manganese dioxide nanosheet. 2. Background technology [0002] As a transition metal oxide, manganese dioxide has a variable oxidation state, so it has good electrochemical properties and can be widely used in batteries, supercapacitors, electrochromism, organic electrochemical synthesis and other fields. For example, manganese dioxide has good Faraday capacitance, and can replace expensive ruthenium oxide as an electrode material for electrochemical supercapacitors. Studies have shown that if each manganese atom stores or releases an electron, its capacitance value can reach 1370F / g. But the actual capacitance value is far lower than this theoretical value, which is mainly due to the dense structure of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02H01G9/042
Inventor 郑华均
Owner ZHEJIANG UNIV OF TECH
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