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Co-N-C/carbon nano tube catalyst, preparation method and application thereof

A carbon nanotube and catalyst technology, which is applied in the field of Co-N-C/carbon nanotube catalyst and its preparation, can solve the problems of increasing the overall cost of the catalyst, increasing the cost of the catalyst, and complicated preparation costs, etc., and achieves excellent electrocatalytic performance for oxygen reduction, The effect of low equipment requirements and simple preparation method

Inactive Publication Date: 2018-10-16
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the traditional preparation method is complex and the reaction conditions are relatively harsh, especially carbon materials must be used as precursors, and the preparation of carbon materials is complicated and the cost is not low, which will greatly increase the overall cost of the catalyst
Taking precursor carbon nanotubes as an example, chemical vapor deposition is generally used for their preparation, which is complicated and costly, and the price per gram of carbon nanotubes ranges from a few yuan to several hundred yuan
[0004] In summary, the current methods for preparing transition metal-nitrogen-carbon catalysts have problems such as complex process and harsh reaction conditions, especially the use of carbon supports in the precursors, which greatly increases the cost of catalyst preparation.

Method used

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  • Co-N-C/carbon nano tube catalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1: Prepare Co-N-C / carbon nanotube catalyst with dicyandiamide as carbon and nitrogen source

[0037] S1: 2.0g of CoCl 2 ·6H 2 O and 1.0g of dicyandiamide were dispersed in 20ml of absolute ethanol, ultrasonically dispersed for 25min, dried at 110°C for 12h until it was completely dry, and ground to obtain a powdery mixture;

[0038] S2: Put the mixture into a porcelain boat, place it in a high-temperature tube furnace, feed nitrogen at a rate of 160ml / min, raise the temperature to 650°C at a rate of 6°C / min, keep it warm for 3 hours, cool to room temperature, and grind Obtain black powdery material;

[0039] S3: Put the black powder into 10 mL of hydrochloric acid with a concentration of 1 mol / L, stir at room temperature for 12 hours, filter and dry with suction to obtain the Co-N-C / carbon nanotube catalyst, and the mass of the final product is 0.41 g.

Embodiment 2

[0040] Embodiment 2: Preparation of Co-N-C / carbon nanotube catalyst with melamine as carbon and nitrogen source

[0041] S1: 2.0g of CoCl 2 ·6H 2 O and 4.0 g of melamine were dispersed in 20 ml of absolute ethanol, ultrasonically dispersed for 25 min, dried at 80°C for 24 h, until it was completely dry, and ground to obtain a powdery mixture;

[0042] S2: Put the mixture into a porcelain boat, place it in a high-temperature tube furnace, feed nitrogen at a rate of 130ml / min, raise the temperature to 700°C at a rate of 7°C / min, keep it warm for 2 hours, cool to room temperature, and grind Obtain black powdery material;

[0043] S3: put the black powder into 10 mL of hydrochloric acid with a concentration of 1 mol / L, stir at room temperature for 24 hours, filter and dry with suction to obtain the Co-N-C / carbon nanotube catalyst. The mass of the final product is 0.82 g.

[0044] The SEM of the obtained Co-N-C / carbon nanotube catalyst sample is as figure 1 As shown, the sampl...

Embodiment 3

[0047] Embodiment 3: Preparation of Co-N-C / carbon nanotube catalyst with melamine as carbon and nitrogen source

[0048] S1: 2.0g of CoCl 2 ·6H 2 O and 4.0 g of melamine were dispersed in 20 ml of absolute ethanol, ultrasonically dispersed for 25 min, dried at 80° C. for 24 h, and ground to obtain a powdery mixture;

[0049]S2: Put the powder mixture into a porcelain boat, place it in a high-temperature tube furnace, feed nitrogen at a rate of 120ml / min, raise the temperature to 800°C at a rate of 6°C / min, keep it for 2 hours, and then cool to room temperature , ground into a black powdery material;

[0050] S3: Put the black powder into 10 mL of hydrochloric acid with a concentration of 1 mol / L, stir at room temperature for 12 hours, filter and dry with suction to obtain the Co-N-C / carbon nanotube catalyst, and the mass of the final product is 0.88 g.

[0051] The SEM image of the Co-N-C / carbon nanotube catalyst sample prepared by the above-mentioned preparation method is ...

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a Co-N-C / carbon nano tube catalyst, a preparation method and application thereof. The method for preparing the Co-N-C / carbon nano tube catalyst comprises the following steps: S1, dispersing cobalt chloride and organic amine into absolute ethyl alcohol, and obtaining mixed powder after ultrasonic, drying and grinding treatment; and S2, carrying out calcinations on the mixed powder obtained in S1 in an inert gas atmosphere, and then carrying out acid treatment after the calcinations so as to obtain a Co-N-C / carbon nano tube. According to the method, the mixture of nickel chloride and organic amine is pyrolyzed through simple high-temperature pyrolysis creatively, namely the Co-N-C / carbon nano tube catalystis prepared and obtained, and a carbon material does not need to be used as a precursor, so that the cost is greatly reduced. Moreover, the performance of the carbon nano tube in the prepared and obtained Co-N-C / carbon nano tube catalyst is good.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a Co-N-C / carbon nanotube catalyst and a preparation method and application thereof. Background technique [0002] Proton exchange membrane fuel cell is a new type of energy device that directly converts chemical energy into electrical energy. It has the advantages of environmental protection, high energy density, high conversion efficiency, diversified fuels, high reliability and fast start-up. A clean energy society is of great significance. Currently, the cathode oxygen reduction reaction of proton exchange membrane fuel cells needs to consume a large amount of platinum-based catalysts. However, platinum-based catalysts are expensive, have limited reserves, and are easily poisoned, which greatly limits the large-scale application of proton exchange membrane fuel cells in commercialization. Therefore, the development of cheap and efficient non-precious metal cathode oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/90B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/8647H01M4/9083Y02E60/50
Inventor 钟国玉杜唤琪刘磊刘铧滨李思敏傅小波
Owner DONGGUAN UNIV OF TECH
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