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Preparation method of octahedral Mn3O4 nanoparticles

A nanoparticle and octahedron technology, which is applied in the field of synthesis of nanomaterials for chemical power sources, can solve the problems of few reports on air electrode catalysts for aluminum-air batteries, and achieve excellent oxygen reduction catalytic performance, low cost, and simple process.

Inactive Publication Date: 2014-09-17
CHANGSHA FEIBO CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, the research on manganese oxides has mostly focused on doping or supporting carbon materials to improve the conductivity, and the synthesis of manganese oxides with special morphology may have special exposed crystal faces, which may greatly promote the transfer of oxygen on the oxide surface. Adsorption of the octahedral Mn on the synthesis of specific exposed facets 3 o 4 There are few reports on catalysts for air electrodes of aluminum-air batteries

Method used

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  • Preparation method of octahedral Mn3O4 nanoparticles
  • Preparation method of octahedral Mn3O4 nanoparticles
  • Preparation method of octahedral Mn3O4 nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 0.4g of potassium permanganate for later use, accurately measure 20ml of N-N-dimethylformamide (DMF) and 50ml of deionized water, mix the two evenly, and then add potassium permanganate. After being stirred evenly, it was transferred to a high-pressure reactor with a volume of 100 ml and lined with polytetrafluoroethylene, and the reaction temperature was set at 140° C., and the reaction time was 12 hours. After the reaction was completed, it was naturally cooled to room temperature and reduced Suction filtration, washing, vacuum drying at 60°C for 24 hours, and finally grinding to obtain the product. The resulting product is characterized by XRD, and its XRD pattern is shown in figure 1 , showing that the product prepared by this example is pure phase Mn 3 o 4 . SEM observation of the product ( figure 2 ) shows that the obtained product is a regular octahedron with a particle size of 400-500nm.

[0033] The prepared target material, activated carbon, acetyl...

Embodiment 2

[0035] Weigh 0.4g of potassium permanganate for later use, accurately measure 35ml of N-N-dimethylformamide (DMF) and 35ml of deionized water, mix the two evenly, and then add potassium permanganate. After being stirred evenly, it was transferred to a high-pressure reactor with a volume of 100 ml and lined with polytetrafluoroethylene, and the reaction temperature was set at 140° C., and the reaction time was 12 hours. After the reaction was completed, it was naturally cooled to room temperature and reduced Suction filtration, washing, vacuum drying at 60°C for 24 hours, and finally grinding to obtain the product. The resulting product is characterized by XRD, and the result shows that the product prepared by this embodiment is a pure phase Mn 3 o 4 . The scanning electron microscope observation of the product shows that the obtained product is a regular octahedron with a regular shape and a particle size of 400-500nm.

Embodiment 3

[0037] Weigh 0.4g of potassium permanganate for later use, accurately measure 20ml of N-N-dimethylformamide (DMF) and 50ml of deionized water, mix the two evenly, and then add potassium permanganate. After stirring evenly, transfer it to a high-pressure reactor with a volume of 100 ml and lined with polytetrafluoroethylene, set the reaction temperature to 120 ° C, and the reaction time to be 12 hours. After the reaction is completed, naturally cool to room temperature and reduce Suction filtration, washing, vacuum drying at 60°C for 24 hours, and finally grinding to obtain the product. The resulting product is characterized by XRD, and its XRD spectrum is shown in image 3 , the results show that the main phase of the product prepared in this example is Mn 3 o 4 , the secondary phase is MnOOH. SEM observation of the product ( Figure 4) shows that the obtained product is mainly regular octahedron with a small amount of rod-like morphology.

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Abstract

The invention discloses a preparation method of octahedral Mn3O4 nanoparticles. An octahedral Mn3O4 catalyst is obtained by virtue of a one-step hydrothermal method, wherein a mixed solvent is composed of N-N-dimethylformamide (DMF) and water, and potassium permanganate is used as the raw material. The controlled synthesis of a target product can be realized through controlling the ratio of DMF to water, the hydrothermal reaction temperature and the reaction time. The preparation method disclosed by the invention has the advantages of simple process, low cost, short period and the like and is suitable for industrial production. The prepared octahedral Mn3O4 nanomaterial is regular in shape, uniform in particle distribution and excellent in oxygen reduction catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanomaterials for chemical power supplies, and in particular relates to an octahedral Mn 3 o 4 Preparation method of nanoparticles. Background technique [0002] Energy nanomaterials with specific morphology have attractive physical and chemical properties, and have always been a research hotspot. Nanomaterials with special morphology have unique nanostructures and are widely used in basic research and industrial applications, such as lithium-ion batteries, gas sensors, catalytic industry and energy storage. So far, methods for synthesizing nanomaterials with special morphology have been reported frequently. Common synthesis methods include thermal decomposition of metal precursors, sol-gel method, hydrothermal method, etc. [0003] Among transition metals, manganese oxides have always been the focus of research, and their applications include lithium-ion batteries, electrocatalysis, molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B82Y30/00
Inventor 王海燕金冠华张辉刘平胡秉华胡鸣海陈娜万浩
Owner CHANGSHA FEIBO CHEM TECH
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