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Mesoporous trimanganese tetraoxide and preparation method thereof

A technology of manganese tetroxide and manganese tetroxide material, applied in the field of nanomaterials, can solve the problems of high energy consumption, complicated preparation process and high production cost, and achieve the effects of high safety, easy availability of raw materials and low cost

Active Publication Date: 2016-08-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both the roasting method and the hydrothermal method need to be carried out under high temperature or high pressure, and the preparation process is complicated, the energy consumption is large, and the production cost is high, so it is not an ideal method for low-cost large-scale production

Method used

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  • Mesoporous trimanganese tetraoxide and preparation method thereof
  • Mesoporous trimanganese tetraoxide and preparation method thereof
  • Mesoporous trimanganese tetraoxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] At room temperature, mix 200 mL of 0.0056 mol / L mannitol aqueous solution with 40 mL of 0.187 mol / L potassium permanganate aqueous solution, stir or sonicate until the purple color of the solution disappears;

[0029] Then add 0.35 mL hydrazine hydrate (50%) while stirring, and react for a period of time (0.2~3 h);

[0030] Filter, wash (with deionized water, alcohol) 3 to 5 times, and dry at 80°C to obtain trimanganese tetraoxide.

[0031] Electrochemical performance test:

[0032] Using the trimanganese tetraoxide sample prepared in this example as the active material, acetylene black (AB) as the conductive agent, and polytetrafluoroethylene (PTFE) as the binder, Mn 3 o 4 : AB: PTFE (mass ratio) = 8: 1.5: 0.5, making electrode materials for supercapacitors. The specific steps are as follows: the active material, acetylene black and PTFE are mixed and fully ground, then N-methyl-2-pyrrolidone (NMP) is added dropwise, ground into a paste, evenly coated on a stainless...

Embodiment 2

[0042] At room temperature, mix 200 mL of 0.0041 mol / L mannitol aqueous solution with 40 mL of 0.187 mol / L potassium permanganate aqueous solution;

[0043] All the other steps are the same as in Example 1.

[0044] figure 1 2 curves in the XRD spectrum of the sample obtained in this example.

[0045] image 3 2 curves in the example are the nitrogen adsorption, desorption isotherm curve and pore size distribution figure of the sample prepared in this example;

[0046] 2 in Table 1 is the specific surface area, pore diameter and specific capacitance value of the sample prepared in this example.

[0047] Through the above analysis and calculation, it is known that the morphology and structure of the sample obtained in this example are basically the same as in Example 1, the difference is that the specific surface area and pore diameter of the sample obtained in this example are respectively 128 m2 / g and 19.3 nm. As a supercapacitor electrode material: its specific capacita...

Embodiment 3

[0049] At room temperature, mix 200 mL of 0.0049 mol / L mannitol aqueous solution with 40 mL of 0.187 mol / L potassium permanganate aqueous solution;

[0050] All the other steps are the same as in Example 1.

[0051] figure 1 The 3 curve among is the XRD pattern of samples obtained in this example.

[0052] image 3 3 curves in this example are the nitrogen adsorption, desorption isotherm curve figure and pore size distribution figure of the sample made in this example;

[0053] 3 in Table 1 is the specific surface area, pore diameter and specific capacitance value of the sample prepared in this example.

[0054] Through the above analysis and calculation, it is known that the morphology and structure of the sample obtained in this example are basically the same as in Example 1, the difference is that the specific surface area and pore diameter of the sample obtained in this example are respectively 112 m 2 / g and 22.2 nm. As a supercapacitor electrode material: its specif...

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Abstract

The invention relates to mesoporous trimanganese tetraoxide and a preparation method thereof. The preparation method includes: mixing a potassium permanganate solution in a certain molar concentration ratio with a mannitol solution, stirring until purple fades away, adding a reducing agent, stirring for reaction, filtering, washing and drying to obtain the mesoporous trimanganese tetraoxide. The mesoporous trimanganese tetraoxide which is similar to sponge morphologically and structurally has advantages of large specific surface area, narrow pore size distribution and the like and is applicable to fields of supercapacitors, batteries, catalysis and sewage treatment. The mesoporous trimanganese tetraoxide has excellent comprehensive electrochemical performances when serving as a super electrode material, wherein a specific capacity in an aqueous electrolyte is 190-250F / g, excellent rate performance is achieved (the retention rate being 60-70% at a charging-discharging rate of 50mv / s), and high cycle stability is realized (the retention rate being higher than 99% in charging and discharging for 2000 times at 2A / g). In addition, compared with a traditional preparation method, the method has advantages of easiness in raw material acquisition, high yield, short production cycle, low equipment requirement and the like, thereby being easy for industrialization.

Description

technical field [0001] The invention relates to a mesoporous trimanganese tetraoxide and a preparation method thereof, specifically a three-dimensional network structure mesoporous trimanganese tetraoxide and a preparation method thereof, belonging to the technical field of nanomaterials. technical background [0002] In recent years, porous materials with novel structures and good properties have been greatly developed in the fields of energy, chemical engineering, construction, and medical treatment due to their low density, large specific surface area, and high pore volume. application. [0003] Trimanganese tetroxide is a tetragonal crystal of spinel. Because of its wide resources, low price and environmental friendliness, it has been widely used in many fields: such as catalysis, biosensing, lithium batteries, supercapacitors, etc. With the development of electronic technology and biotechnology, the porous material of trimanganese tetraoxide has more and more important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
CPCC01G45/02C01P2002/72C01P2004/03C01P2006/12C01P2006/16C01P2006/40
Inventor 余丽丽李爽范骏李荣兵赵景泰
Owner SHANGHAI UNIV
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