Preparation method of manganous manganic oxide/nitrogen-doped carbon nanotube composite material

A technology of manganese tetroxide and nitrogen-doped carbon, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor conductivity, poor stability, low catalytic performance, etc., and achieve superior performance and good ORR performance. Effect

Active Publication Date: 2018-07-13
GUANGDONG UNIV OF TECH
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Problems solved by technology

Among them, platinum is considered to be one of the most active single-component electrocatalysts, but its high cost, poor stability, and easy poisoning limit its wide application.
Transition metal oxides such as tricobalt tetroxide, triferrous oxide, cuprous oxide, etc. have poor catalytic performance due to poor conductivity

Method used

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  • Preparation method of manganous manganic oxide/nitrogen-doped carbon nanotube composite material
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  • Preparation method of manganous manganic oxide/nitrogen-doped carbon nanotube composite material

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preparation example Construction

[0050] The present invention proposes a preparation method of trimanganese tetraoxide / nitrogen-doped carbon nanotube composite material, which specifically includes the following steps:

[0051] S1: Preparation of oxidized exfoliated carbon nanotubes;

[0052] S2: preparing the exfoliated carbon nanotubes in step S1 into a certain concentration of exfoliated carbon nanotube dispersion, and then adding a certain amount of concentrated ammonia water to make the dispersion solution into an alkaline dispersion solution with alkalinity;

[0053] S3: Make the manganese salt into a certain concentration of manganese salt solution, and add the manganese salt solution and nitrogen source to the alkaline dispersion solution in step S2, after stirring for a certain period of time, put the alkaline dispersion solution into a constant temperature ultrasonic The reactor device reacts for a certain period of time to obtain a dispersed solution;

[0054] S4: The dispersion solution in step S...

Embodiment 1

[0082]Pour 100 mL of concentrated sulfuric acid into a 500 mL round bottom flask, then add 1 g of multi-walled carbon nanotubes, and stir with a magnetic stirrer to obtain an acidic dispersion solution.

[0083] Then, 100 mL of concentrated sulfuric acid was added to the flask and stirred, and 3 g of potassium permanganate was slowly added to the dispersion, and stirred for 30 min to obtain a purple-red mixture.

[0084] Place the above-mentioned purple-red mixture in a water bath at 80°C for 2 hours and keep stirring, then slowly add 20 mL of hydrogen peroxide and ice cubes with a volume of 300 mL to the mixture to obtain a yellow dispersion solution; the above-mentioned yellow solution was centrifuged, Washing with 10% hydrochloric acid and secondary water for several times, centrifuging, and finally freeze-drying to obtain exfoliated carbon nanotubes.

[0085] After adding 50mL of 1mg / mL aqueous dispersion of exfoliated carbon nanotubes into a 100mL glass bottle, add 2mL of...

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Abstract

The invention discloses a preparation method of a manganous manganic oxide / nitrogen-doped carbon nanotube composite material. The preparation method specifically comprises the steps of configuring stripped carbon nanotubes into a striped carbon nanotube dispersion solution of a certain concentration; next, adding a certain amount of stronger ammonia water to change the dispersion solution into analkali dispersion solution; preparing a manganese salt into a manganese salt solution of a certain concentration, adding the manganese salt solution and a nitrogen source into the alkali dispersion solution, performing stirring for a certain time, and putting the alkali dispersion solution into an ultrasonic reactor at a constant temperature to be reacted for a certain time to obtain a dispersionsolution; and finally, performing repeated suction filtration and washing on the dispersion solution for multiple times, and then carrying out vacuum drying to obtain the manganous manganic oxide / nitrogen-doped carbon nanotube composite material. By virtue of the technical scheme, the preparation method and process of a transitional metal oxide can be further optimized.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic functional materials, in particular to a preparation method of trimanganese tetraoxide / nitrogen-doped carbon nanotube composite material. Background technique [0002] Both fuel cells and metal-air batteries contain anode reactions and cathode reactions, and the kinetics of the cathode oxygen reduction reaction (ORR) is very slow, with a rate of about one-thousandth of the anode reaction, so too high an overpotential is a limitation. The bottleneck of fuel cell output power and energy efficiency. [0003] Commonly used ORR catalysts mainly include noble metals, such as platinum and rhodium. Among them, platinum is considered to be one of the most active single-component electrocatalysts, but its high cost, poor stability, and easy poisoning limit its wide application. Transition metal oxides such as tricobalt tetroxide, triiron tetroxide, cuprous oxide, etc. have poor catalytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90
CPCH01M4/8647H01M4/9016H01M4/9083Y02E60/50
Inventor 施志聪黄宗雄古谢放刘军樊青录
Owner GUANGDONG UNIV OF TECH
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