Preparation method of tubular sandwich-structure CNT@Ni@Ni2(CO3)(OH)2 composite material
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A composite material and sandwich technology, applied in the field of composite materials, can solve the problems of high electronic conductivity, low capacity and energy density, and large specific surface area of carbon materials, and achieve the effect of improving specific capacity, improving cycle life and high purity
Inactive Publication Date: 2017-03-08
TONGJI UNIV
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Carbon materials have high electronic conductivity, large specific surface area, good corrosion resistance, good thermal stability, low cost and easy processing; but their low capacity and energy density limit their further development
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Embodiment 1
[0040] 1) Preparation of functionalized multi-walled carbon nanotubes
[0041] In the first step, accurately weigh 50.0 mg of original multi-walled carbon nanotubes and dissolve them in 30 mL H 2 SO 4 and 10mL HNO 3 In the mixed solution, ultrasonic dispersion. multi-walled carbon nanotubes with H 2 SO 4 and HNO 3The molar ratio of the mixed solution is 1:7; H 2 SO 4 with HNO 3 The volume ratio is 3:1;
[0042] In the second step, place a 100mL round-bottomed flask equipped with a magnetic stirrer, reflux condenser, and thermometer in an oil bath, add the ultrasonic solution, heat under reflux in an oil bath at 65°C for 5h, and cool naturally to room temperature.
[0043] In the third step, the product in the round bottom flask was collected. The product was washed, repeatedly washed with deionized water until the solution was neutral, and dried in a vacuum oven at 60° C. for 10 hours to obtain functionalized multi-walled carbon nanotubes.
[0044] 2) Synthesis of c...
Embodiment 2
[0055] The preparation method of functionalized multi-walled carbon nanotubes comprises the following steps:
[0056] Dissolving multi-walled carbon nanotubes in H 2 SO 4 and HNO 3 In the mixed solution, multi-walled carbon nanotubes and H 2 SO 4 and HNO 3 The molar ratio of the mixed solution is 1:6; H 2 SO 4 with HNO 3 The volume ratio of the solution is 3:1; ultrasonic dispersion, the time is 7 minutes; heating and reflux, the temperature is 75 ° C, the time is 4 hours, then naturally cooled to room temperature, the product is collected, and washed repeatedly with deionized water until the solution is neutral , functionalized multi-walled carbon nanotubes were obtained after vacuum drying; the temperature of vacuum drying was 70° C., and the time was 12 hours.
[0057] The preparation method of the core-shell structure CNT@Ni composite material comprises the following steps:
[0058] Accurately weigh 50 mg of functionalized carbon nanotubes, dissolve them in 50 mL ...
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Abstract
The invention discloses a preparation method of a tubular sandwich-structure CNT@Ni@Ni2(CO3)(OH)2 composite material. The preparation method comprises the steps of uniformly dispersing nickel chloride hexahydrate and functionalized multi-wall carbon nanotube in ethylene glycol, adding a reducing agent hydrazine for high-temperature back flow, centrifugally collecting a product, repeatedly washing the product, and performing vacuum drying to obtain core-shell structure CNT@Ni; and dissolving the core-shell structure CNT@Ni and the nickel chloride hexahydrate in deionized water, placing the core-shell structure CNT@Ni and the nickel chloride hexahydrate in a semi-permeable membrane, dissolving sodium carbonate in the deionized water, placing the sodium carbonate outside the semi-permeable membrane, centrifugally collecting a product after standing for a night, repeatedly washing the product, and performing vacuum drying to obtain the tubular sandwich-structure CNT@Ni@Ni2(CO3)(OH)2 composite material. On the basis of combining an oxygen-containing metal compound and a carbon material, a metal nickel monomer is added, thus, the conductivity of the whole material can be improved, meanwhile, the specific capacity of the composite material is also greatly improved, and the cycle lifetime of the composite material is also greatly prolonged. The composite material has the advantages of process simplicity, preparation condition universality, product morphology stability and high purity, the product is convenient and simple to process and is suitable for medium-scale industrial production.
Description
technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to the preparation of a tubular sandwich structure CNT@Ni@Ni by a kinetically controlled chemical co-precipitation method 2 (CO 3 )(OH) 2 Composite approach. Background technique [0002] With the development of the economy, the accompanying greenhouse effect, climate change and the consumption of fossil fuels (such as coal, oil and natural gas, etc.), force mankind to face the dual challenges of environmental problems and energy crises, making the development of new energy and renewable energy Clean energy has become an urgent issue in today's world. As a new type of energy storage device, supercapacitor has good electrical properties, high energy density, long cycle life, fast charge and discharge speed, cheap and easy to obtain, showing irreplaceable advantages, and has attracted people's attention and attention. , in the fields of laser weapons, intel...
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