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Preparation method of porous carbon-supported transition metal oxide composite material

A technology of porous carbon materials and transition metals, applied in the field of material chemistry, can solve problems such as high cost, complex process, and slow reaction rate, and achieve the effects of low cost, good material structure uniformity, and improved electrocatalytic performance

Inactive Publication Date: 2019-05-21
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It effectively overcomes the shortcomings of the prior art cathode ORR oxygen evolution reaction rate is too slow, complex process, high cost, etc.

Method used

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  • Preparation method of porous carbon-supported transition metal oxide composite material
  • Preparation method of porous carbon-supported transition metal oxide composite material
  • Preparation method of porous carbon-supported transition metal oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation process of the element-free porous carbon material loaded transition metal oxide material is as follows:

[0040] Take the mass ratio CNT:PAN:PMMA=1:0.4:15; the solute mass fraction of the dimethylamide solution is 1%, and the average particle size of PMMA is 2-20μm.

[0041] (1) Dissolve PAN completely in dimethylamide; CNT is uniformly dispersed in absolute ethanol; then the two liquids are mixed, and PMMA is added in proportion, and the ultrasonic dispersion is uniform; the organic solvent is slowly evaporated under natural conditions; finally in N 2 Under the atmosphere, the temperature was raised to 400° C. for 2 hours at 3° C. / min, and then the temperature was raised to 800° C. for 4 hours to obtain a porous carbon material.

[0042] (2) Dissolve 1.74g of cobalt nitrate hexahydrate, 0.37g of ammonium fluoride, and 1.2g of urea in 80ml of deionized water, and form a pink solution under magnetic stirring;

[0043] (3) Add 1.422g of cetyltrimethylam...

Embodiment 2

[0049] Take the mass ratio CNT:PAN:PMMA=1:0.4:15; the solute mass fraction of the dimethylamide solution is 1%, and the average particle size of PMMA is 2-20μm.

[0050] (1) Dissolve PAN completely in dimethylamide; CNT is uniformly dispersed in absolute ethanol; then the two liquids are mixed, and PMMA is added in proportion, and the ultrasonic dispersion is uniform; the organic solvent is slowly evaporated under natural conditions; finally in N 2 Under the atmosphere, the temperature was raised to 400° C. for 2 hours at 3° C. / min, and then the temperature was raised to 800° C. for 4 hours to obtain a porous carbon material.

[0051] (2) Dissolve 1.74g of cobalt nitrate hexahydrate, 0.37g of ammonium fluoride, and 1.2g of urea in 80ml of deionized water, and form a pink solution under magnetic stirring;

[0052] (3) Add cobalt nitrate hexahydrate and nickel nitrate hexahydrate into the pink solution in step (2) at a molar ratio of 1:0.05, stir magnetically to fully dissolve ...

Embodiment 3

[0058] Steps (1), (2), (4), (5), (6), (7) are the same as [Example 2],

[0059] Step (3): Add cobalt nitrate hexahydrate and nickel nitrate hexahydrate into the pink solution in step (2) at a molar ratio of 1:0.15, stir magnetically to make it fully dissolve, and the color of the solution turns dark pink.

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Abstract

The invention relates to a preparation method of a porous carbon-supported transition metal oxide composite material. A porous carbon material is firstly prepared by the following steps of completelydissolving polyacrylonitrile in dimethylamide, and uniformly dispersing carbon nanotubes in absolute ethyl alcohol; mixing the two liquids, adding PMMA in proportion and uniformly dispersing the PMMAby ultrasonic; slowly evaporating the organic solvent under natural conditions; and annealing under N2 atmosphere to obtain the porous carbon material. The preparation method of a porous carbon-supported transition metal oxide composite material comprises the following steps of dissolving cobalt nitrate hexahydrate, nickel nitrate hexahydrate, manganese chloride, ammonium fluoride, urea and cetyltrimethylammonium bromide in proportion to the deionized water, placing the obtained solution and the porous carbon material in a reaction vessel, and preparing the porous carbon-supported transition metal oxide composite material by hydrothermal reaction. The invention has the advantages of simple process, low cost, good material structure uniformity, large specific surface area and excellent electrochemical performance, and is used for preparing an oxygen reduction catalyst for a zinc-air battery cathode.

Description

technical field [0001] The invention relates to a preparation method of a porous carbon-supported transition metal oxide composite material, and specifically relates to the technical field of material chemistry. Background technique [0002] As we all know, the combustion of fossil fuels will cause serious pollution to the environment and greatly endanger human health. This is a very serious problem facing society today. Therefore, it is imperative to research and develop safe, environmentally friendly and green renewable energy. In recent years, metal-air batteries have attracted much attention due to their low operational risk, low emissions, high transport capacity, high energy density, light weight, and environmental friendliness. They are showing unprecedented great charm in modern life. [0003] As anode catalyst materials for metal-air batteries, metal oxides have the advantages of abundant reserves, high theoretical capacity, stable chemical properties, and low eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/06
Inventor 李生娟夏志伟赵文艺朱钰方
Owner UNIV OF SHANGHAI FOR SCI & TECH
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