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A method of preparing a tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes

A technology of cobalt tetroxide and carbon nanotubes, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high cost of precious metals, limited precious metals, and low resource reserves, and achieve the effect of easy acquisition and simple preparation process

Pending Publication Date: 2018-05-15
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the water splitting process is not a spontaneous reaction and requires high potentials and electrocatalysts to increase the reaction rate, making the oxidation evolution reaction (OER) a bottleneck in the water splitting process.
[0006] However, the current high-efficiency OER catalysts mainly use noble metals such as Ru and Ir, but the cost of the above two noble metals is high and the resource reserves are extremely low, so the application of noble metals is severely limited.

Method used

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  • A method of preparing a tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes
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  • A method of preparing a tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes

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preparation example Construction

[0046] The present invention proposes a method for preparing a nitrogen-doped exfoliated carbon nanotube-supported cobalt tetroxide material, comprising the following steps:

[0047] Step S1: preparing exfoliated carbon nanotubes;

[0048] Step S2: preparing a nitrogen-doped exfoliated carbon nanotube-supported cobalt tetroxide material.

[0049] Wherein, above-mentioned step S1 comprises the following steps:

[0050] Step S11: Pour concentrated acid into a flask containing carbon nanotubes, stir and mix thoroughly to obtain a dispersion solution;

[0051] Step S12: Slowly add a strong oxidizing agent to the dispersion solution in Step S11, and stir for a certain period of time to obtain a mixture;

[0052] Step S13: heating the mixture in step S12 in a water bath for a period of time and keeping stirring;

[0053] Step S14: adding hydrogen peroxide and deionized water to the mixture in step S13 to obtain a dispersion;

[0054] Step S15: Repeatedly centrifuging and washing...

Embodiment 1

[0075] In the embodiment of the present invention, when preparing exfoliated carbon nanotubes, pour 150mL of concentrated sulfuric acid into a 500mL round bottom flask containing 1g of multi-walled carbon nanotubes, stir with a magnetic stirrer to obtain a dispersion solution, and then slowly add 6g of potassium permanganate was stirred for 30 minutes to obtain a purple-red mixture. The obtained purple-red mixture was placed in a water bath at 80°C and heated for 2 hours, and stirring was required during the heating in the water bath.

[0076] Then, 20 mL of hydrogen peroxide and ice cubes with a volume of 300 mL were slowly added to the mixture heated in a water bath to obtain a yellow solution. Then the yellow solution is centrifuged, washed with 10% hydrochloric acid and secondary water for several times and then centrifuged, and finally freeze-dried to obtain the exfoliated carbon nanotubes.

[0077]In addition, when preparing nitrogen-doped exfoliated carbon nanotubes loa...

Embodiment 2

[0079] When preparing exfoliated carbon nanotubes in the embodiment of the present invention, pour 300mL of concentrated sulfuric acid into a 500mL round-bottomed flask equipped with 2g of multi-walled carbon nanotubes, stir with a magnetic stirrer to obtain a dispersion solution, and then slowly add Add 6g of potassium permanganate, and stir for 30 minutes to obtain a purple-red mixture. Place the obtained purple-red mixture in a water bath at 80° C. for 2 hours and keep stirring, which needs to be kept stirring during the heating in the water bath.

[0080] Then slowly add 20mL of hydrogen peroxide and ice cubes with a volume of 500mL to the mixture heated in a water bath to obtain a yellow solution, then centrifuge the yellow solution, and then wash it with 10% hydrochloric acid and secondary water. centrifuged, and finally freeze-dried to obtain exfoliated carbon nanotubes.

[0081] In addition, when preparing nitrogen-doped exfoliated carbon nanotubes loaded with cobalt t...

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Abstract

A method of preparing a tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes is disclosed. The method includes subjecting carbon nanotubes to liquid-phase exfoliation witha strong oxidant and a concentrated acid to prepare exfoliated carbon nanotubes; and loading the exfoliated carbon nanotubes with tricobalt tetroxide nanoparticles through a hydrothermal reaction manner, wherein the exfoliated carbon nanotubes react with a nitrogen source and a cobalt source to obtain the tricobalt tetroxide material loaded by nitrogen-doped exfoliated carbon nanotubes. The method is simple in process, raw materials are easily available, and the method is prone to industrial production. In addition, the prepared tricobalt tetroxide material loaded by nitrogen-doped exfoliatedcarbon nanotubes has good ORR performance, excellent OER performance and a good application prospect in the field of oxygen electrocatalysis.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic functional materials, in particular to a preparation method of a nitrogen-doped exfoliated carbon nanotube-loaded tricobalt tetroxide material. Background technique [0002] Whether it is a fuel cell or a metal-air battery, there are anode and cathode reactions, in which the cathode oxygen reduction reaction (ORR) kinetics is very slow, the rate is about one thousandth of the anode reaction, and the overpotential is too high to limit the fuel. The bottleneck of battery output power and energy power. [0003] In the prior art, ORR catalysts include noble metals, such as platinum and rhodium. Platinum is considered to be one of the most active single-component electrocatalysts, but its practical application is limited due to the disadvantages of high cost, poor stability, and easy poisoning. In addition, transition metal oxides such as tricobalt tetroxide, triiron tetroxide, and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9016H01M4/9083Y02E60/50
Inventor 施志聪黄宗雄谭植元刘军刘斌
Owner GUANGDONG UNIV OF TECH
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