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Graphene/carbon nano tube/carbon nanofiber electrocatalyst and preparation method thereof

A carbon nanofiber, carbon nanotube technology, applied in the field of carbon nanofiber-based electrocatalyst and its preparation, can solve the problems of lack of active sites, large contact resistance, non-interconnection of fibers, etc., to improve the reduction performance and the degree of graphitization The effect of increasing, wide application prospects

Active Publication Date: 2015-12-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its technical defects are: there is no doping of heteroatoms such as nitrogen, there is a lack of sufficient active sites, and the fibers are not connected, and there is a large contact resistance.
Its technical defect is that the fibers do not communicate with each other, and there is a large contact resistance

Method used

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  • Graphene/carbon nano tube/carbon nanofiber electrocatalyst and preparation method thereof
  • Graphene/carbon nano tube/carbon nanofiber electrocatalyst and preparation method thereof
  • Graphene/carbon nano tube/carbon nanofiber electrocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] The graphene / carbon nanotube / carbon nanofiber electrocatalyst of this embodiment is made according to the following method:

[0043] (1) Preparation of spinning solution: Cobalt nitrate (Co(NO 3 ) 2 ), PAN (molecular weight 30000) and DMF were mixed and stirred uniformly at a mass ratio of 0.15:1:9 to obtain a homogeneous spinning solution;

[0044] (2) Electrospinning: The homogeneous spinning solution obtained in step (1) was electrospun to collect Co(NO 3 ) 2 / PAN fibril felt; the process parameters of the electrospinning are: the metal needle with an internal diameter of 0.8mm is used as the nozzle, the spinning voltage is 15kV, the vertical distance from the needle point to the receiving screen is 15cm, and the feed rate is 15 μL / min , the spinning temperature is 25°C, the relative humidity of the air is 30RH%, and the flat aluminum foil is collected;

[0045] (3) Pre-oxidation: Co(NO 3 ) 2 / PAN fibril mat is placed in a pre-oxidation furnace, and in an air a...

Embodiment 2

[0056] The graphene / carbon nanotube / carbon nanofiber electrocatalyst of this embodiment is made according to the following method:

[0057] (1) Preparation of spinning solution: ferric chloride (FeCl 3 ), PVP (molecular weight 1,500,000) and DMSO were mixed and stirred uniformly at a mass ratio of 0.1:1:9 to obtain a homogeneous spinning solution;

[0058] (2) Electrospinning: Electrospinning the homogeneous spinning solution obtained in step (1) to collect FeCl 3 / PVP fibril felt; the process parameters of the electrospinning are: the metal needle with an inner diameter of 0.8mm is used as the nozzle, the spinning voltage is 12kV, the vertical distance from the needle tip to the receiving screen is 25cm, and the feed rate is 20 μL / min , the spinning temperature is 30°C, the relative humidity of the air is 15RH%, and the flat aluminum foil is collected;

[0059] (3) Pre-oxidation: FeCl obtained in step (2) 3 / PVP fibril mats are placed in a pre-oxidation furnace, and in an ...

Embodiment 3

[0064] The graphene / carbon nanotube / carbon nanofiber electrocatalyst of this embodiment is made according to the following method:

[0065] (1) Preparation of spinning solution: Nickel acetylacetonate (Ni(C 5 h 7 o 2 ) 2 ), phenolic resin (molecular weight: 120000) and DMF were mixed and stirred uniformly at a mass ratio of 0.25:1:9 to obtain a homogeneous spinning solution;

[0066] (2) Electrospinning: The homogeneous spinning solution obtained in step (1) was electrospun to collect Ni(C 5 h 7 o 2 ) 2 / phenolic resin fibril mat; the process parameters of the electrospinning are: the metal needle with an internal diameter of 0.8mm is used as the nozzle, the spinning voltage is 20kV, the vertical distance from the needle point to the receiving screen is 10cm, and the feed rate is 10 μL / min, the spinning temperature is 10°C, the relative air humidity is 40RH%, and the flat aluminum foil is collected;

[0067] (3) Pre-oxidation: Ni(C) obtained in step (2) 5 h 7 o 2 ...

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Abstract

The invention provides a graphene / carbon nano tube / carbon nanofiber electrocatalyst and a preparation method thereof. The electrocatalyst is prepared with the method comprising steps as follows: (1), spinning solution preparation: transition metal salt, a carbon nanofiber precursor polymer and a solvent are mixed uniformly, and a homogeneous spinning solution is obtained; (2), electrospinning: the homogeneous spinning solution is used for electrospinning, fibril felt is obtained; (3), pre-oxidation: the fibril felt is pre-oxidized in an air atmosphere, and pre-oxidized fiber felt is obtained; (4), pyrolysis: the pre-oxidized fiber felt is mixed uniformly with a graphite-phase carbon nitride precursor and graphite-phase carbon nitride and pyrolyzed in an inert atmosphere, and the graphene / carbon nano tube / carbon nanofiber electrocatalyst is obtained. The electrocatalyst has high electrical conductivity, many favorable active sites, good oxygen reduction electrocatalysis performance and better electrocatalysis performance, can be widely applied to the fields of super capacitors, cathode catalysis of fuel cells and the like; the preparation method is simple and large-scale production can be realized.

Description

technical field [0001] The invention relates to a carbon nanofiber-based electrocatalyst and a preparation method thereof, in particular to a graphene / carbon nanotube / carbon nanofiber electrocatalyst and a preparation method thereof. Background technique [0002] Due to their high efficiency, cleanliness and noiselessness, fuel cells play an important role in the fields of communication, energy and automobiles. However, the kinetics of the cathode oxygen reduction reaction in fuel cells is relatively slow, which greatly limits its practical application. Although platinum-carbon (Pt / C) catalysts are considered to be effective catalysts for oxygen reduction reactions, the low natural reserves of platinum make Pt / C catalysts expensive and less stable, which limits the large-scale commercialization of fuel cells. application. Therefore, a lot of energy has been invested in the synthesis of non-noble metals and even non-metallic materials, in order to obtain the activity compar...

Claims

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Application Information

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IPC IPC(8): B01J21/18H01M4/90
CPCY02E60/50
Inventor 王应德雷永鹏施旗
Owner NAT UNIV OF DEFENSE TECH
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