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Preparing method of nanotube-nickel-nickel cobalt silicate catalyst

A technology of nanotubes and silicate, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of expensive materials

Inactive Publication Date: 2018-11-13
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials are currently more expensive

Method used

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  • Preparing method of nanotube-nickel-nickel cobalt silicate catalyst
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  • Preparing method of nanotube-nickel-nickel cobalt silicate catalyst

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Embodiment 1

[0026] (1) Disperse carbon nanotubes in ethanol (30mL), water (10mL) and C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added to adjust the pH to 10. After stirring for 30 min, 10 mL of ethyl orthosilicate was added. After reacting at room temperature for 18 h, it was centrifuged and washed three times with a mixed solution of methanol and water. in a dry box at 100 o C dried for 24h. Get carbon nanotube-SiO 2 Coaxial core-shell nanotubes, SiO 2 The shell thickness is 15nm (eg figure 2 , as shown in 3).

[0027] (2) Take 1g carbon nanotube-SiO 2 , 0.3g nickel nitrate, 0.4g cobalt acetylacetonate, add ammonia water, adjust the pH to 8. Put the mixed solution into the autoclave and heat to 50 o C, after reacting for 24h, cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain carbon nanotube-nickel cobalt silicate coaxial core-shell nanotubes (...

Embodiment 2

[0031] (1) Disperse carbon nanotubes in ethanol (30mL), water (10mL) and C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added to adjust the pH to 12. After stirring for 30 min, 10 mL of ethyl orthosilicate was added. After reacting at room temperature for 18 h, it was centrifuged and washed three times with a mixed solution of methanol and water. in a dry box at 100 o C dried for 24h. Get carbon nanotube-SiO 2 Coaxial core-shell nanotubes, SiO 2 The shell thickness is 15nm (eg figure 2 , as shown in 3).

[0032] (2) Take 1g carbon nanotube-SiO 2 , 0.3g nickel nitrate, 0.4g cobalt acetylacetonate, add ammonia water, adjust the pH to 11. Put the mixed solution into the autoclave and heat it to 135 o C, after reacting for 24h, cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain carbon nanotube-nickel cobalt silicate coaxial core-shell nanotu...

Embodiment 3

[0036] (1) Disperse carbon nanotubes in ethanol (30mL), water (10mL) and C n TAB (n=10) (30mg) in the mixed solution. After stirring for 30 min, aqueous ammonia (30 mL) was added to adjust the pH to 14. After stirring for 30 min, 10 mL of ethyl orthosilicate was added. After reacting at room temperature for 18 h, it was centrifuged and washed three times with a mixed solution of methanol and water. in a dry box at 100 o C dried for 24h. Get carbon nanotube-SiO 2 Coaxial core-shell nanotubes, SiO 2 The shell thickness is 15nm (eg figure 2 , as shown in 3).

[0037] (2) Take 1g carbon nanotube-SiO 2 , 0.3g nickel nitrate, 0.4g cobalt acetylacetonate, add ammonia water, adjust the pH to 13. Put the mixed solution into the autoclave and heat to 220 o C, after reacting for 24h, cool to room temperature. Centrifuge, wash with methanol, ethanol, and water, and put it into a 100-degree drying oven. Obtain carbon nanotube-nickel cobalt silicate coaxial core-shell nanotubes...

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Abstract

The invention discloses a preparing method of a nanotube-nickel-nickel cobalt silicate catalyst. The preparing method includes the following steps: (1) dispersing a carbon nanotube in a surfactant, adjusting the pH to 10-14, and adding a silicon source to obtain a carbon nanotube-SiO2 coaxial nuclear shell nanotube; (2) adding nickel precursors and cobalt precursors into the carbon nanotube-SiO2 coaxial nuclear shell nanotube, adjusting the pH to 8-13, and preparing a carbon nanotube-nickel cobalt silicate coaxial nuclear shell nanotube at the temperature of 50-220oC; (3) reducing the carbon nanotube-nickel cobalt silicate coaxial nuclear shell nanotube at the temperature of 300-800oC in a 5% nitrogen atmosphere to obtain the carbon nanotube-nickel-nickel cobalt silicate coaxial nuclear shell catalyst. The obtained catalyst has the advantages of high specific surface area, high catalytic activity in oxygen evolution reaction, high catalytic activity in oxygen reduction, high electric conductivity, low cost and the like; when the catalyst serves as an electrode material for lithium oxygen batteries, by-products such as lithium carbonate can be inhibited, and both the battery discharging capacity and the cycle index are high.

Description

technical field [0001] The invention relates to a preparation method of a nanotube-nickel-nickel-cobalt silicate catalyst, which belongs to the technical field of chemical industry, and in particular relates to a lithium-oxygen battery electrode material. Background technique [0002] The theoretical discharge capacity of the lithium-oxygen battery can reach 11140Wh kg -1 , has received extensive attention from scholars at home and abroad. Carbon-based materials such as carbon nanotubes and graphene have high electrical conductivity, high specific surface area, and special structures, which are often used as electrode materials. When carbon materials are used in lithium-oxygen batteries, these carbon materials are prone to side reactions with ether-based electrolytes, especially when the charging voltage of the oxygen evolution reaction is greater than 4.7V, the side reactions are very obvious, and a large amount of by-products such as lithium carbonate can be produced . T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M12/08B82Y30/00
CPCB82Y30/00H01M4/9016H01M4/9041H01M4/9083H01M12/08Y02E60/10
Inventor 李自卫李敏
Owner GUIZHOU INST OF TECH
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