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A kind of composite carbon airgel and preparation method thereof

A composite aerogel, carbon aerogel technology, applied in nano-carbon, electrical components, nanotechnology for materials and surface science, etc., can solve the problems of few active sites, poor mechanical properties, low energy density, etc. , to achieve the effect of high active sites, high mechanical properties, and high energy density

Active Publication Date: 2019-02-22
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of existing pure carbon airgel materials such as poor mechanical properties, poor adsorption, few active sites, and low energy density, which cannot meet the actual needs of energy storage and conversion devices. The present invention provides a A method to utilize natural nanofibrillated cellulose and transition metal composite carbon aerogels

Method used

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  • A kind of composite carbon airgel and preparation method thereof
  • A kind of composite carbon airgel and preparation method thereof
  • A kind of composite carbon airgel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Prepare a 0.01% nanocellulose dispersion with bamboo pulp purchased in the market and process it with an ultrasonic pulverizer at 1500W for 60 minutes to obtain a dispersion;

[0038] 2. centrifuge the dispersion obtained in step 1, take the supernatant and pack it into a dialysis bag with a molecular weight range of 8000-14000, then place the dialysis bag in a 1M Co and Ni metal salt solution, Co:Ni= Perform ion exchange in 1:1 for 2 hours;

[0039] 3. Treat the dialysis bag in step 2 in alkaline solution for 4 hours;

[0040] 4. Rinse the dialysis bag treated in step 3 with a large amount of deionized water until the dispersion is neutral;

[0041] 5. Soak the dialysis bag rinsed in step 4 in tert-butanol and replace it in tert-butanol for 24 hours, and mechanically stir with a magnetic stirrer until the volume of the remaining suspension is about 1 / 3 of the original volume, and collect the remaining Put the suspension into a bottle, freeze it in an ultra-low tem...

Embodiment 2

[0045] 1. Take 1 g of purchased commercial eucalyptus pulps and add them to 0.05 mol / L phosphate buffer solution (90 mL, pH=6.86) in a closed reaction vessel, and stir evenly;

[0046] 2. Then add TEMPO (0.016g, 0.1mmol), 5% sodium hypochlorite solution (1.5mL, 1.0mmol) and sodium chlorite (80%, 1.13g, 10mmol) in sequence, and finally seal the container immediately and place it at 80°C Heating in an oil bath, stirring and reacting at 500rpm for 2h. The reaction system is TEMPO / NaClO / NaClO 2oxidation system. After cooling to room temperature, the samples were rinsed with deionized water until neutral, and stored at 4 °C for future use.

[0047] 3. Make the dispersion in step 2 into a 0.5wt% nanocellulose dispersion and treat it with an ultrasonic pulverizer at 1500W for 60 minutes to further obtain a dispersion;

[0048] 4. Centrifuge the dispersion obtained in step 2, take the supernatant and put it into a dialysis bag with a molecular weight range of 8000-14000, and then p...

Embodiment 3

[0055] 1. Prepare a 0.1wt% nanocellulose dispersion from bacterial cellulose (BC) and process it with an ultrasonic pulverizer at 1500W for 60 minutes to obtain a dispersion;

[0056] 2. the dispersion obtained in step 1 is centrifuged, and the supernatant is taken into a dialysis bag whose molecular weight range is 8000-14000, and then the dialysis bag is placed in 0.5M Fe and Ni metal salt solution, Fe:Ni= 1:50, carry out ion exchange for 2h;

[0057] 3. Treat the dialysis bag in step 2 in alkaline solution for 1 hour;

[0058] 4. Rinse the dialysis bag treated in step 3 with a large amount of deionized water until the dispersion is neutral;

[0059] 5. Soak the dialysis bag rinsed in step 4 in tert-butanol and replace it in tert-butanol for 24 hours, and mechanically stir with a magnetic stirrer until the volume of the remaining suspension is about 1 / 3 of the original volume, and collect the remaining Put the suspension into a bottle, freeze it in a -55°C ultra-low temper...

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Abstract

The invention discloses composite carbon aerogel. Biomass nano fibrillating cellulose is subjected to ion substitution in transition metal solutions of different proportions to obtain final inorganic-cellulose composite aerogel; and high-temperature pyrolysis is performed in a nitrogen-rich atmosphere to prepare the composite carbon aerogel. The invention also discloses a preparation method of the composite carbon aerogel. The composite carbon aerogel disclosed by the invention can be applied to supercapacitors, lithium ion batteries, sodium ion batteries, catalysis, superpara magnetism, adsorption and the like, and provides a new idea and a novel method for efficiently utilizing biomass resources.

Description

technical field [0001] The invention relates to a composite carbon aerogel, in particular to a composite carbon aerogel of a natural nanocellulose precursor and a transition metal and a preparation method thereof. Background technique [0002] Carbon airgel materials with a unique pore structure are used in many fields. Because of their cheap source and good cycle stability, they have been widely used in catalysis, lithium-ion batteries, adsorption, supercapacitors and other energy storage and conversion. field. However, the disadvantages of pure carbon materials such as low chemical activity, small specific capacitance, relatively poor adsorption performance, and poor catalytic performance hinder their wider application. In the pursuit of solutions to improve the electrochemical performance of carbon materials without compromising stability and power density, one-dimensional nanostructures show initial promise due to their unique structures such as directional electron / ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15H01M4/90B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00H01M4/90H01M4/9083Y02E60/50
Inventor 卢芸孔雪琳叶贵超
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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