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A kind of silver/carbon nanotube composite material and its preparation method and application

A technology of composite materials and carbon nanotubes, applied in the direction of material electrochemical variables, structural parts, electrical components, etc., can solve problems such as high specific surface area, uneven distribution, weak combination of silver nanoparticles and carbon materials, and achieve high The effect of specific surface area, high catalytic performance, and simple and easy preparation method

Active Publication Date: 2021-05-25
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a silver / carbon nanotube composite material and its preparation method and application, which not only overcomes the defects of weak combination and uneven distribution of silver nanoparticles and carbon materials, but also obtains the thickness of the tube wall. Tunable silver / carbon nanotube composites with simultaneous carbonization of polydopamine to yield high specific surface area, porous, nitrogen-enriched carbon nanotubes

Method used

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  • A kind of silver/carbon nanotube composite material and its preparation method and application
  • A kind of silver/carbon nanotube composite material and its preparation method and application
  • A kind of silver/carbon nanotube composite material and its preparation method and application

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Embodiment 1

[0039] (1) The sulfonated PS nanofibers were immersed in an aqueous solution of 10 mM Tris-HCl containing 2 mg / mL DA, pH=8.5, and reacted for 20 h. After the reaction, in order to remove unadhered PDA, the nanofibers were thoroughly washed several times with ultrapure water to obtain PDA-modified PS nanofibers.

[0040] (2) Immerse the PDA-modified PS nanofibers obtained in step (1) into 10 mg / mL AgNO 3 The solution was reacted for 1.5 h, washed several times with ultrapure water, and then dried in a vacuum oven at 50° C. for 8 h to obtain Ag / PDA-modified PS nanofibers.

[0041] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 5°C / min under nitrogen atmosphere, keep it for 1h, and carry out carbonization to obtain Ag / carbon nanotube composite The material is denoted as 1-AgNPs-NCNTs.

[0042] The scanning electron microscope picture of PS nanofiber in the present embodiment is as figure 2 As shown in A, the scannin...

Embodiment 2

[0045] (1) The sulfonated PS nanofibers were immersed in an aqueous solution of 10 mM Tris-HCl containing 2 mg / mL DA, pH=8.5, and reacted for 20 h. After the reaction, in order to remove unadhered PDA, the nanofibers were thoroughly washed several times with ultrapure water to obtain PDA-modified PS nanofibers.

[0046] (2) Immerse the PDA-modified PS nanofibers obtained in step (1) into 10 mg / mL AgNO 3 React in the solution for 1.5h, wash with ultrapure water several times, and then repeatedly immerse in dopamine solution and silver nitrate solution under the same conditions. After washing, it was placed in a vacuum drying oven and dried at 50° C. for 8 hours to obtain Ag / PDA-modified PS nanofibers.

[0047] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 5°C / min under nitrogen atmosphere, keep it for 1h, and carry out carbonization to obtain Ag / carbon nanotube composite The material is denoted as 2-AgNPs-NCNTs.

...

Embodiment 3

[0056] (1) The sulfonated PS nanofibers were immersed in an aqueous solution of 10 mM Tris-HCl containing 2 mg / mL DA, pH=8.5, and reacted for 20 h. After the reaction, in order to remove unadhered PDA, the nanofibers were thoroughly washed several times with ultrapure water to obtain PDA-modified PS nanofibers.

[0057] (2) Immerse the PDA-modified PS nanofibers obtained in step (1) into 10 mg / mL AgNO 3 React in the solution for 1.5h, wash with ultrapure water for several times, and then immerse in dopamine solution and silver nitrate solution under the same conditions twice. After washing, it was placed in a vacuum drying oven and dried at 50° C. for 8 hours to obtain Ag / PDA-modified PS nanofibers.

[0058] (3) Transfer the sample obtained in step (2) to a tube furnace, raise the temperature to 800°C at a rate of 5°C / min under nitrogen atmosphere, keep it for 1h, and carry out carbonization to obtain Ag / carbon nanotube composite The material is denoted as 3-AgNPs-NCNTs.

...

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Abstract

The invention relates to a silver / carbon nanotube composite material and its preparation method and application. Polydopamine and silver nanoparticles are coated on the surface of polystyrene nanofibers, and the thickness of silver / polydopamine is adjusted by layer-by-layer self-assembly. Made by direct removal of polystyrene fiber templates by carbonization. The preparation method of the invention is simple and easy, the reaction conditions are mild, the silver nanoparticles are evenly distributed, the prepared silver / carbon nanotube composite material is nitrogen-rich and porous, and the thickness of the tube wall is controllable. The composite material is used to prepare active electrocatalysts for peroxidation The fields of hydrogen electrochemical sensors, fuel cell catalysts show good promise.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a silver / carbon nanotube composite material and its preparation method and application. Background technique [0002] Carbon materials are attractive catalytic materials due to their excellent properties, such as excellent chemical stability, large surface area, and high electrical conductivity. Carbon materials modified by noble metal nanoparticles (eg, Ag, Au, Pt, Pd, etc.) can greatly improve the catalytic performance. Among these noble metal nanoparticles, silver nanoparticles (AgNPs) have attracted extensive attention due to their high catalytic activity, cheap price, and excellent thermal and electrical conductivity. Highly dispersed silver nanoparticles can greatly improve the catalytic performance of the material. However, silver nanoparticles are prone to agglomeration, resulting in a decrease in electrochemical activity. In order to improve this problem, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30H01M4/86H01M4/88H01M4/90
CPCY02E60/50
Inventor 刘建允窦金磊朱国栋胡彬李旋史威聂鹏飞唐倩杨洪海
Owner DONGHUA UNIV
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