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Method for preparing CoFe alloy/graphene oxide/carbon nanotube composite material

A technology of carbon nanotubes and composite materials, applied in the field of material chemistry, can solve the problems of high cost, poor stability, cumbersome preparation process, etc., achieve strong repeatability, overcome slow reaction rate, and simple preparation process

Pending Publication Date: 2020-07-28
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen reduction performance is better than monometallic Fe, Co catalyst, so this kind of urea treatment bimetallic Fe, Co combines with graphene oxide to derive the material of CoFe alloy / porous graphene base / carbon nanotube composite structure, and the preparation process of the present invention is simple , strong repeatability, no harm to the environment, large-scale production, high use value, effectively overcome the existing cumbersome preparation process, poor stability, high cost, scarce sources of precious metals, easy poisoning and slow kinetics, etc. shortcoming

Method used

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  • Method for preparing CoFe alloy/graphene oxide/carbon nanotube composite material
  • Method for preparing CoFe alloy/graphene oxide/carbon nanotube composite material
  • Method for preparing CoFe alloy/graphene oxide/carbon nanotube composite material

Examples

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Embodiment 1

[0024] A method for preparing CoFe alloy / graphene oxide / carbon nanotube composite material by treating Fe and Co bimetals with urea

[0025] Step 1) FeCl 3 9H 2 O (40.54mg) and Co(NO 3 ) 2 ·6H 2 O (21.82mg) molar ratio nFe:nCo=1:0.5, (n represents molar mass) mixed with urea (1.5g) and oil bath, the oil temperature was kept at 80°C, the stirring speed was 300rpm, stirring for 12h until dry;

[0026] Step 2) Grind and mix 1 g of the powder obtained in step 1) with 50 mg of graphene oxide powder, place it in a crucible, cover the crucible, and place in the Ar 2 Calcination was carried out under atmospheric conditions; first, the temperature was raised to 550°C at 3°C / min and kept for 2 hours; then the tube furnace was heated to 800°C at 3°C / min and kept for 2 hours; 2 Under the protection of the furnace, the furnace was naturally cooled to room temperature, and a uniform carbon nanotube structure was obtained. The sample was named Fe 1 co 0.5 -N-C, for zinc-air battery ca...

Embodiment 2

[0028] Step 1) FeCl 3 9H 2 O (40.54mg) and urea (1.5g) were mixed and put in an oil bath, the oil temperature was kept at 80°C, the stirring speed was 300 rpm, and stirred for 12 hours until dry;

[0029] Step 2) is the same as in Example 1 to obtain a sample Fe-N-C.

Embodiment 3

[0031] Step 1) Co(NO 3 ) 2 ·6H 2 O (21.82mg) and urea (1.5g) were mixed and put in an oil bath, the oil temperature was kept at 80°C, the stirring speed was 300 rpm, and stirred for 12 hours until dry;

[0032] Step 2) is the same as in Example 1 to obtain a sample Co-N-C.

[0033] Example 1 of the present invention prepares sample Fe 1 co 0.5 The morphology of -N-C is as figure 1 It can be seen that there is a rich carbon nanotube structure on the graphene sheet, and there is a rich pore structure between the graphene sheets, and metal nanoparticles of CoFe alloy are formed on the top of the carbon nanotube. The porous structure induced by this Fe and Co The graphene oxide / carbon nanotube structure prevents metal agglomeration, which is conducive to the combination of metal and different nitrogen to form abundant active sites (M-Nx, N-C), and at the same time increases the specific surface area, making the air cathode the same as O 2 Fully contact, and promote the tran...

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Abstract

The invention relates to a method for preparing a CoFe alloy / graphene oxide / carbon nanotube composite material. The method adopts urea to treat Fe and Co bimetals. The preparation method comprises thefollowing steps of: adding ferric salt, cobalt salt and urea into deionized water, and performing oil-bath mixing and stirring until drying; uniformly grinding the obtained powder and graphene oxidepowder; calcining under the condition of Ar2; heating to 550 DEG C at a speed of 3-10 DEG C / min, keeping the temperature for 2 hours, heating a tubular furnace to 600-900 DEG C at a speed of 3-10 DEGC / min, keeping the temperature for 2 hours, and naturally cooling to room temperature, thereby obtaining the oxygen reduction catalyst with the CoFe alloy / porous graphene oxide / carbon nanotube multi-dimensional composite structure. The preparation method is simple in preparation process and low in cost; the material has good structure uniformity, has the advantages of high crystallinity, excellentelectrochemical performance and the like, is used for preparing the oxygen reduction catalyst of a zinc-air cell cathode; and the defect that a noble metal catalyst is high in cost, complex in preparation process and difficult to industrialize is overcome.

Description

technical field [0001] The invention relates to a method for preparing a CoFe alloy / graphene oxide / carbon nanotube composite material by treating metal Fe and Co with urea. Specifically related to the field of materials chemistry technology. The prepared CoFe alloy / graphene oxide / carbon nanotube composite material is used to make an oxygen reduction catalyst for metal-air battery cathode. Background technique [0002] With the rapid development of high-density energy storage portable electronic devices, the demand for renewable and sustainable energy is increasingly urgent. So far, research on lithium-ion batteries and supercapacitors has received a lot of attention. However, their low energy density and low finite cycle life remain a controversial issue. In recent years, the theoretical energy density of rechargeable metal (M) air batteries (M = Li, Zn, Mg, Al, etc.) is 1086-11140Wh / kg -1 Within the range, long-term stability is strong, showing unlimited potential and e...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/18B01J37/08H01M4/90H01M12/06
CPCB01J37/0009B01J37/08B01J27/24B01J21/185H01M4/9041H01M4/9083H01M12/06B01J35/393B01J35/33
Inventor 张婷李生娟郭春卉寿天罗意霍云浩
Owner UNIV OF SHANGHAI FOR SCI & TECH
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