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A kind of silver loaded cellulose/carbon nanotube composite material and its preparation method and application
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A technology of carbon nanotubes and composite materials, applied in the field of electrocatalytic materials for clean energy, can solve problems such as destroying the flexibility of cellulose
Active Publication Date: 2021-11-19
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
The second is to carbonize the nanocellulose material to give it conductivity, but the carbonization treatment seriously destroys the flexibility of cellulose
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Embodiment 1
[0030] This embodiment provides a method for preparing a cellulose sample, the specific steps are as follows:
[0031] 1) Take 50 mg of cellulose and disperse it in 20 mL of deionized water, sonicate it with an ultrasonic cell pulverizer for 20 minutes, then move it to an ice-water bath and stir for 2 hours. The temperature of the ice-water bath is kept at 0°C, and the stirring speed is 300 rpm to obtain a uniform dispersion of cellulose ;
[0032] 2) Pour the homogeneous cellulose dispersion prepared in step 1 into a petri dish and quickly put it into an ultra-low temperature refrigerator, and freeze it at -80° C. for 12 hours. Then transfer to a freeze dryer for vacuum drying for 24 hours to obtain a silver cellulose sample material.
Embodiment 2
[0034] This embodiment provides a method for preparing a cellulose / carbon nanotube composite material, the specific steps are as follows:
[0035] 1) Disperse 50 mg of cellulose in 20 mL of deionized water, sonicate for 10 minutes with an ultrasonic cell pulverizer, then add 50 mg of CNT and continue to sonicate for 10 minutes, then move to an ice-water bath and stir for 2 hours. The temperature of the ice-water bath is kept at 0 ° C, and the stirring speed is 300 rpm , to obtain a uniform dispersion of cellulose / carbon nanotubes;
[0036] 2) Pour the cellulose / carbon nanotube uniform dispersion prepared in step 1 into a petri dish, put it into an ultra-low temperature refrigerator quickly, and freeze it at -80° C. for 12 hours. Then transfer to a freeze dryer for vacuum drying for 24 hours to obtain a cellulose / carbon nanotube composite material.
Embodiment 3
[0038] This embodiment provides a method for preparing a silver-loaded cellulose / carbon nanotube composite material, the specific steps are as follows:
[0039] 1) Take 50 mg of cellulose and disperse it in 20 mL of deionized water, sonicate for 10 minutes with an ultrasonic cell pulverizer, then add 50 mg of CNT and continue to sonicate for 10 minutes to obtain a uniform dispersion of cellulose / carbon nanotubes;
[0040] 2) Add 25 mg of silver nitrate to the solution in 1) and stir in an ice-water bath for 30 minutes. The temperature of the ice-water bath is kept at 0°C and the stirring speed is 300 rpm to ensure that the silver nitrate is fully and uniformly dissolved in the cellulose / carbon nanotube dispersion ;
[0041] 3) Dissolve 53 mg of sodium borohydride in 10 mL of deionized water to prepare a 0.14 M sodium borohydride solution. During the preparation of the sodium borohydride solution, carry out in an ice-water bath, slowly add sodium borohydride into the beaker and...
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Abstract
The invention discloses a preparation method of a silver-loaded cellulose / carbon nanotube composite material. Firstly, the cellulose and the carbon nanotube are ultrasonically mixed, then silver nitrate is added to stir evenly, and sodium borohydride solution is added dropwise in an ice-water bath at a constant flow. , after 2 hours of liquid phase reaction in an ice-water bath, centrifuge and wash, and then ultrasonically disperse the centrifuge, pour the uniform dispersion into a petri dish and quickly put it into an ultra-low temperature refrigerator, and freeze it at -80°C for 12 hours. Finally, it was transferred to a freeze dryer for vacuum drying for 24 hours to obtain a silver-loaded cellulose / carbon nanotube composite material. The invention has the advantages of simple operation, strong controllability, environmental friendliness, high flexibility, bending resistance, low cost and the like. Oxygen reduction catalysts that can be used in flexible air battery cathodes for wearable electronic devices overcome the rigid defects of traditional batteries and the shortcomings of cumbersome preparation processes, high costs, poor stability, and slow kinetics.
Description
technical field [0001] The invention relates to a silver-loaded cellulose / carbon nanotube composite material and its preparation method and application, in particular to the technical field of electrocatalytic materials for clean energy. Background technique [0002] In recent years, with the rapid advancement of electronic technology, more and more electronic devices are developing in the direction of thinner, lighter, more flexible and wearable. In such an era background, flexible electronic devices composed of flexible substrates emerged as the times require. Flexible electronic products refer to flexible electronic devices that can be bent, twisted, folded in half or rolled up to a certain extent without damaging their structure or weakening their performance. It has many unique properties, such as variable shape depending on the use environment, small size, light weight and portability, etc. It not only has extensive and important applications in information, medical, ...
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