A kind of tricobalt tetroxide-amino carbon nanotube composite electrocatalytic material and its preparation and application

A technology of amino carbon nanotubes and cobalt tetroxide, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of incomparable catalytic performance, achieve excellent catalytic performance, improve electrical conductivity and Effects of specific surface area and electrochemical stability improvement

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the composites of mixed-valent transition metal oxides and conductive materials reported so far are composites of oxides and conductive materials, such as the reported MnO x / C (J. Phys. Chem. C, 2007, 1434), Co 3 o 4 / N-graphene (Nat.Mater.,2011,780), Fe 3 Composites such as C / Carbon Nanotube (J.Am.Chem.Soc., 2015, 1436) are used for ORR or OER, but the catalytic performance of these composite catalysts cannot be compared with existing commercial catalysts, nor can they be used as Bifunctional catalyst catalyzes ORR and OER simultaneously

Method used

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  • A kind of tricobalt tetroxide-amino carbon nanotube composite electrocatalytic material and its preparation and application
  • A kind of tricobalt tetroxide-amino carbon nanotube composite electrocatalytic material and its preparation and application
  • A kind of tricobalt tetroxide-amino carbon nanotube composite electrocatalytic material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh 140 mg of carbon nanotubes and put them in 100 mL of concentrated sulfuric acid and concentrated nitric acid mixed acid with a volume ratio of 1:3. After 300 W ultrasonic dispersion for 2 hours, wash and centrifuge with deionized water for 5 times, then dry in an oven at 70 ° C to obtain carbon dioxide nanotube.

[0033] (2) Add 60 mg of oxidized carbon nanotubes, 192 mg of sodium hyponitrate and 5 mL of ethylenediamine into 50 mL of dimethylacetamide for mixing, put them into an electric constant temperature blast drying oven and heat to 120° C. and keep the temperature for reaction for 12 hours. Then cool to room temperature, filter and wash with deionized water for 3 times, and then dry in an oven at 60° C. to obtain amino carbon nanotubes.

[0034] (3) Add 15 mg of amino carbon nanotubes and 20 mg of cobalt acetate hexahydrate to 50 mL of a mixture of dimethylformamide and ethanol (volume ratio 8:2), heat at 80°C and stir for 1 hour, add 0.5 mL of ammonia ...

Embodiment 2

[0043] (1) Weigh 140 mg of carbon nanotubes and put them in 100 mL of concentrated sulfuric acid and concentrated nitric acid mixed acid with a volume ratio of 1:5. After 5 hours of ultrasonic dispersion at 300 W, wash and centrifuge with deionized water for 7 times, and then dry in an oven at 80 ° C to obtain carbon dioxide nanotube.

[0044] (2) Add 120 mg of oxidized carbon nanotubes, 240 mg of sodium hyponitrate and 10 mL of ethylenediamine into 50 mL of dimethylacetamide for mixing, put them into an electric constant temperature blast drying oven and heat to 150° C. and keep the temperature for reaction for 12 hours. Then cool to room temperature, filter and wash with deionized water for 5 times, and then dry in an oven at 80° C. to obtain amino carbon nanotubes.

[0045] (3) Add 30 mg of aminocarbon nanotubes and 50 mg of cobalt acetate hexahydrate to 50 mL of a mixed solution of dimethylformamide and ethanol (volume ratio 8:2), heat at 100° C. and stir for 2 hours, add ...

Embodiment 3

[0049] (1) Weigh 140mg of carbon nanotubes and place them in 100mL of concentrated sulfuric acid and concentrated nitric acid mixed acid with a volume ratio of 1:1. After 300W ultrasonic dispersion for 2 hours, wash and centrifuge with deionized water for 6 times, then dry in an oven at 70°C to obtain oxidized carbon nanotubes. carbon nanotubes.

[0050] (2) Add 100 mg of oxidized carbon nanotubes, 234 mg of sodium hyponitrate and 8 mL of triethylenetetramine into 50 mL of dimethylacetamide for mixing, put them in an electric constant temperature blast drying oven and heat to 140 ° C and keep warm for 11 hour, then cooled to room temperature, filtered and washed with deionized water for 4 times, and then dried in an oven at 70°C to obtain amino carbon nanotubes.

[0051] (3) Add 20 mg of aminocarbon nanotubes and 200 mg of cobalt acetate hexahydrate to 50 mL of a mixture of dimethylformamide and ethanol (volume ratio 8:2), heat at 80° C. and stir for 1 hour, add 2 mL of ammoni...

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Abstract

The invention belongs to the field of electrocatalytic materials, and discloses a cobalt tetraoxide / amino carbon nano-tube composite electrocatalytic material, preparation and applications thereof. The preparation comprises: oxidizing carbon nano-tubes by using the mixed acid of concentrated sulfuric acid and concentrated nitric acid to obtain oxidized carbon nano-tubes; adding the oxidized carbonnano-tubes, sodium hyponitrite and an amino functional agent to dimethylacetamide, heating to a temperature of 120-150 DEGC, and carrying out a thermal insulation reaction to obtain amino carbon nano-tubes; and adding the amino carbon nano-tubes, a cobalt metal salt and ammonia water to the mixed solution of dimethylformamide and ethanol, and carrying out a hydrothermal reaction at a temperatureof 150-180 DEGC to obtain the cobalt tetraoxide / amino carbon nano-tube composite electrocatalytic material. According to the present invention, the preparation method is simple, and the obtained catalytic material has good catalytic performance in the oxygen evolution reaction and the oxygen reduction reaction, can be used as the dual-function electrocatalyst for fuel cells or metal-air batteries,and has broad application prospects.

Description

technical field [0001] The invention belongs to the field of electrocatalytic materials, and in particular relates to a composite electrocatalytic material of tricobalt tetroxide-aminocarbon nanotubes and its preparation and application. Background technique [0002] Due to their large reserves, easy preparation, and excellent redox stability in alkaline media, mixed-valent transition metal oxides can be used as catalytic materials to replace noble metals. In addition, various valence states and structural flexibility make transition metal oxides offer the possibility to further tune their catalytic performance. Recent studies have shown that this oxide has good electron transport ability, high specific surface area and good electrochemical stability, but when used as a dual-functional electrocatalyst for oxygen reduction (ORR) and oxygen evolution (OER) , its low electrical conductivity seriously affects its performance. Therefore, it is necessary to add some conductive m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9016H01M4/9083Y02E60/50
Inventor 蒋仲杰陈泊宏刘美林
Owner SOUTH CHINA UNIV OF TECH
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