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A kind of preparation method of α-mno2 nanowire

A technology of aqueous solution and potassium permanganate, applied in the direction of nanotechnology, manganese oxide/manganese hydroxide, etc., can solve the problems of complicated operation and high cost, and achieve good repeatability

Active Publication Date: 2018-06-29
MATERIAL & IND TECH RES INST BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the α-MnO in the prior art 2 The preparation method of nanowires has the problems of complex operation, need for additional additives, and high cost. To provide a low-cost α-MnO with simple operation and no need for additional additives 2 Preparation method of nanowire

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  • A kind of preparation method of α-mno2 nanowire
  • A kind of preparation method of α-mno2 nanowire
  • A kind of preparation method of α-mno2 nanowire

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preparation example Construction

[0019] The present invention provides a kind of α-MnO 2 A method for preparing nanowires, the method comprising:

[0020] (1) Add manganese sulfate aqueous solution to potassium permanganate aqueous solution and mix;

[0021] (2) Under the condition of hydrothermal reaction, the mixed solution obtained by mixing is subjected to hydrothermal reaction;

[0022] Wherein, the concentration of the manganese sulfate aqueous solution is 0.5-2mol / L, and the concentration of the potassium permanganate aqueous solution is 0.5-2mol / L;

[0023] The conditions of the hydrothermal reaction include: the temperature is 120-180°C, and the time is 12-24h.

[0024] According to the present invention, although the concentration of the manganese sulfate aqueous solution is 0.5-2mol / L, the concentration of the potassium permanganate aqueous solution is 0.5-2mol / L and can be used in the step (1) of the present invention, in order to obtain the The appearance and properties of α-MnO are more suita...

Embodiment 1

[0037] This embodiment is used to illustrate the α-MnO of the present invention 2 Methods of preparing nanowires.

[0038] (1) At a stirring speed of 300 rpm, add 150 mL of 1 mol / L manganese sulfate aqueous solution into 150 mL of 1 mol / L potassium permanganate aqueous solution, and continue stirring for 40 min after the addition to obtain a mixture of the two;

[0039](2) Pour the above mixed solution into a reaction kettle with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 140°C for 24 hours, then filter the product after the hydrothermal reaction, and use water to , absolute ethanol for washing, and then dry the obtained solid at 80°C for 24h, and grind the dried solid (the grinding speed is 2800rpm, and the time is 5min); thereby obtaining α-MnO with a diameter of 30nm and a length of 10μm 2 Nanowires. The resulting MnO was determined by measuring the nanowire XRD pattern 2 Nanowires as α-MnO 2 Nanowires. Its SEM pattern is as figure 1 shown.

Embodiment 2

[0041] This embodiment is used to illustrate the α-MnO of the present invention 2 Methods of preparing nanowires.

[0042] (1) At a stirring speed of 300rpm, add 150mL of 1.2mol / L manganese sulfate aqueous solution to 150mL of 1.2mol / L potassium permanganate aqueous solution, and continue stirring for 40min after the addition to obtain a mixture of the two ;

[0043] (2) Pour the above mixed solution into a reaction kettle with a polytetrafluoroethylene liner, conduct a hydrothermal reaction at 140°C for 24 hours, then filter the product after the hydrothermal reaction, and use water to , absolute ethanol for washing, and then dry the obtained solid at 80°C for 24h, and grind the dried solid (the grinding speed is 2500rpm, and the time is 10min); thereby obtaining α-MnO with a diameter of 25nm and a length of 10μm 2 Nanowires. The resulting MnO was determined by measuring the nanowire XRD pattern 2 Nanowires as α-MnO 2 Nanowires.

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Abstract

The invention relates to the field of gas diffusion electrodes and discloses a preparation method of alpha-MnO2 nanolines. The preparation method comprises the following steps: (1) adding manganese-sulfate aqueous solution into potassium-permanganate aqueous solution to carry out mixing; (2) under the condition of hydrothermal reaction, carrying out hydrothermal reaction on mixed liquid obtained by mixing, wherein the concentration of the manganese-sulfate aqueous solution is 0.5-2mol / L, and the concentration of the potassium-permanganate aqueous solution is 0.5-2mol / L; and the conditions of hydrothermal reaction are as follows: the temperature is 120-180 DEG C, and the time is 12-24 hours. The preparation method disclosed by the invention has the advantages that under the condition without adopting additional additives, the alpha-MnO2 nanolines are prepared in a low-cost and simple manner only on the basis of adopting manganese sulfate and potassium permanganate as materials.

Description

technical field [0001] The invention relates to the field of gas diffusion electrodes, in particular to an α-MnO 2 Methods of preparing nanowires. Background technique [0002] Catalysts used in air diffusion electrodes mainly include platinum, silver, precious metals, metal oxides and metal chelates. A comparative analysis of various catalysts found that, compared with precious metal catalysts such as Pt, Ag and Pt alloys, and metal oxide catalysts such as perovskite oxides and spinel oxides, traditional α-MnO 2 Catalysts are still the research hotspots of air diffusion electrode catalysts because of their good catalytic activity for oxygen reduction and hydrogen peroxide decomposition, as well as the advantages of low price, easy availability, and environmental friendliness. [0003] At present, the research on the microscopic morphology of manganese dioxide mainly focuses on the preparation of one-dimensional manganese dioxide nanomaterials, that is, linear manganese di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02B82Y40/00
CPCC01G45/02C01P2002/72C01P2004/03C01P2004/16
Inventor 康启平郑树会安清华刘丹宪张彩娟
Owner MATERIAL & IND TECH RES INST BEIJING