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Manganese spinel nano material as well as preparation method and application of manganese spinel nano material

A nano-material and spinel technology, applied in the field of nano-material preparation, can solve the problems of increasing energy consumption and cost, harsh preparation process, etc., and achieve the effect of less energy consumption, high electrocatalytic efficiency, and improved electrocatalytic activity

Active Publication Date: 2011-06-01
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the synthesis temperature of these nanomaterials is lower than that of the traditional high-temperature solid-state method, it is still inevitable to use heating means and the entire preparation process is harsh, which greatly increases energy consumption and cost issues.

Method used

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  • Manganese spinel nano material as well as preparation method and application of manganese spinel nano material
  • Manganese spinel nano material as well as preparation method and application of manganese spinel nano material
  • Manganese spinel nano material as well as preparation method and application of manganese spinel nano material

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Embodiment

[0031] 1) Amorphous MnO 2 Preparation of nanoparticles

[0032] First accurately prepare 0.04M KMnO 4 and 0.06M MnCl 2 solution. Then the KMnO was mixed under magnetic stirring 4 The solution is quickly added to the MnCl 2 In the solution, stirring was continued for 30 minutes, and finally centrifuged, and the product was washed three times with deionized water and absolute ethanol respectively, and dried under vacuum at 80° C. for 4 hours.

[0033] According to the MnO prepared by the method described in 1) 2 The XRD pattern of nanoparticles is shown in figure 1 As shown, the diffraction peaks are obviously broadened, showing amorphous MnO 2 feature.

[0034] 2) Tetragonal phase Co x mn 3-x o 4 Preparation of nanoparticles

[0035] Accurately weigh 0.1mmolCoCl 2 ·6H 2 O and MnO 2 Nanoparticles, so that the molar ratio of Co:Mn is 1:2. CoCl 2 ·6H 2 O was dissolved in 15 mL of water, and then the MnO 2 Added to the above CoCl 2 In the solution, ultrasonicall...

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Abstract

The invention provides a manganese spinel nano material which comprises CoxMn(3-x)O4, MgMn2O4 and Mn3O4 nano particles as well as ZnMn2O4 hollow nano spheres, hollow micron spheres or nano pieces. The preparation method is as follows: MnO2 is reduced through a reducing agent at room temperature so as to prepare the manganese spinel nano material. The material can form a three-electrode system used for testing the redox property of the material, namely, in the three-electrode system, nano material is used as a working electrode, a Pt sheet is used as a counter electrode, saturated potassium chloride Ag / AgCl is used as a reference electrode and KOH solution is used as electrolyte. The invention has the advantages that the reaction process is carried out at room temperature, and energy source consumption is less; the nano material has a big specific surface area, and is capable of increasing the contact of active substance with oxygen and electrolyte; and the nano material as an electro-catalyst has high electro-catalysis efficiency, and has important value and actual significance in the fields of spinel oxide nano material preparation, electro-catalysis of metal air batteries and fuel cell and the like.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a kind of manganese series spinel nanomaterials and its preparation method and application. Background technique [0002] Manganese spinel is a kind of manganese-containing oxides, the chemical formula is A x mn 3-x o 4 (0≤x≤2, A is a metal), is an important inorganic functional material. Due to the large number of manganese valence states, cheap price, non-toxic and environmental protection, manganese spinel is widely used in the fields of cathode catalysts for fuel cells and air batteries, gas-sensitive materials, heat-sensitive materials, magnetic materials, and battery materials. [0003] In recent years, with the continuous development of nanotechnology, manganese-based spinel nanomaterials have attracted the attention of many researchers as a new type of high-efficiency electrochemical catalyst. At present, the synthesis techniques of manganese-based spinel nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505C01G45/12H01M4/1391B82Y25/00B82Y40/00
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 陈军王洪波程方益陶占良
Owner NANKAI UNIV
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