Preparation method of 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material

A bimetallic oxide and composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of high energy consumption, long cycle, complicated operation, etc., and achieve the effect of high activity, simple operation, and increased contact area

Inactive Publication Date: 2019-01-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is complex in operation, long in cycle, high in energy consumpti

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  • Preparation method of 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material
  • Preparation method of 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material
  • Preparation method of 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material

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Example Embodiment

[0044] Example 1

[0045] 1) Mix 1g of multi-walled carbon nanotubes with 80mL 40% concentrated nitric acid ultrasonically, and treat them in an oil bath at 110°C for 2h. After filtration, the resulting filter residue is washed with deionized and absolute ethanol to neutrality and dried at 60°C to obtain Acidified multi-walled carbon nanotube-WMCNT;

[0046] 2) The molar ratio of cobalt nitrate and nickel nitrate 2:1 is prepared into an ethanol-water solution with a total metal ion concentration of 0.045 mol / L (the volume ratio of ethanol to water is 1:1), and press NiCo 2 O 4 20% of the theoretical mass of, add the acidified multi-walled carbon nanotube-WMCNT prepared in step 1), after stirring, add a certain amount of urea, adjust the pH to about 11.0, to obtain a black uniform mixed solution;

[0047] 3) Transfer the black homogeneous mixed solution obtained in step 2) to a hydrothermal kettle, with a filling rate of 70%, hold at 110°C for 16 hours, cool at room temperature, filte...

Example Embodiment

[0049] Example 2

[0050] 1) Mix 1g of multi-walled carbon nanotubes with 50mL 50% concentrated nitric acid ultrasonically, and treat them in an oil bath at 80°C for 3 hours. After filtration, the resulting filter residue is washed with deionized and absolute ethanol to neutrality, and dried at 60°C to obtain Acidified multi-walled carbon nanotube-WMCNT;

[0051] 2) The molar ratio of cobalt nitrate and nickel nitrate 2:1 is prepared into an aqueous solution with a total metal ion concentration of 0.075mol / L, and press NiCo 2 O 4 Add 10% of the theoretical product mass of the product to the acidified multi-walled carbon nanotube-WMCNT prepared in step 1). After stirring, add ammonia water dropwise to adjust the pH to about 11.0 to obtain a black uniform mixed solution;

[0052] 3) Transfer the black homogeneous mixed solution obtained in step 2) to a hydrothermal kettle with a filling rate of 70%, keep at 120°C for 7 hours, cool at room temperature, filter, add deionized water and an...

Example Embodiment

[0054] Example 3

[0055] 1) Mix 1g of multi-walled carbon nanotubes with 40mL 60% concentrated nitric acid ultrasonically, and treat them in an oil bath at 110°C for 1.0h. After filtration, the resulting filter residue is washed with deionized and absolute ethanol to neutrality, and dried at 60°C. Obtain acidified multi-walled carbon nanotube-WMCNT;

[0056] 2) Prepare cobalt acetate and nickel acetate at a molar ratio of 2:1 into an ethanol solution with a total metal ion concentration of 0.09mol / L, and press NiCo 2 O 4 Add 15% of the theoretical product mass of the product to the acidified multi-walled carbon nanotube-WMCNT prepared in step 1). After stirring, add ammonia and urea to adjust the pH to about 11.0 to obtain a black uniform mixed solution.

[0057] 3) Transfer the black homogeneous mixed solution obtained in step 2) to a hydrothermal kettle, with a filling rate of 70%, keep at 120°C for 12 hours, and cool at room temperature, filter, add deionized water and absolute e...

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Abstract

The invention provides a preparation method of a 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material, comprising the following steps: 1) multi-wall carbon nanotubesand concentrated nitric acid are ultrasonically mixed evenly, processed by an oil bath, filtered, washed and dried to obtain acidified multi-wall carbon nanotubes; 2) prepare metal ion solution, adding acidify multi-wall carbon nanotubes, uniformly stirring, dropping acid-base regulator to adjust pH to obtain mixed solution; 3) transfer that mixed solution into a hydrothermal kettle, heat preservation to complete the reaction, cooling, filtering, washing, dry and grinding to obtain a composite material precursor; 4) that composite precursor is place in an air atmosphere and subjected to low-temperature pyrolysis treatment to obtain a 3D sea urchin spherical carbon-based nickel-cobalt bimetallic oxide composite material. The composite material prepared by the invention is applied in the zinc-air battery and exhibits excellent catalytic performance, so that the battery not only has high energy efficiency, but also has large power density, current density and specific capacity.

Description

technical field [0001] The invention relates to the technical field of bifunctional catalysts for zinc-air batteries, in particular to a method for preparing a 3D sea urchin spherical carbon-based nickel-cobalt double metal oxide composite material. Background technique [0002] With the rapid development of the economy, the environmental problems caused by the wide application of fossil energy are becoming more and more serious, and the development of clean new energy has become a top priority. Among the many types of energy storage and conversion, electrochemical energy conversion and storage technologies (mainly including metal-air batteries, fuel cells, supercapacitors, electrolyzed water, etc.) have been recognized as one of the most feasible and effective energy conversion and storage methods. Especially in recent years, rechargeable metal-air batteries have attracted a lot of attention from scholars because of their low cost, environmental friendliness, high energy de...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9016H01M4/9083Y02E60/50
Inventor 王接喜肖晓李新海颜果春王志兴郭华军胡启阳彭文杰柴作强
Owner CENT SOUTH UNIV
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