A self-doped nitrogen porous carbon material with three-dimensional network structure and its preparation method and application
A porous carbon material, three-dimensional network technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of complex synthesis process, complex synthesis process, and various raw materials of three-dimensional porous carbon materials, and achieve the goal of facilitating electronic The effect of good transport, lower reaction temperature, good three-dimensional network structure
Active Publication Date: 2022-01-07
GUILIN UNIV OF ELECTRONIC TECH
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[0004] Three-dimensional carbon materials have attracted the attention of many scholars due to their better microscopic morphology, larger specific surface area, and three-dimensional structure is more conducive to electron transport. However, three-dimensional porous carbon materials also face the disadvantages of complex synthesis process and high cost.
The three-dimensional porous carbon material disclosed in the article "KOH-activated carbon aerogels derived from sodium carboxymethyl cellulose for high-performance supercapacitors and dye adsorption" requires three days to synthesize carbon aerogels, and there are many raw materials and complex synthesis processes. -1 When the capacitance reaches only 152.6Fg -1
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[0033] A method for preparing a self-doped nitrogen porous carbon material with a three-dimensional network structure:
[0034] Step 1) Preparation and drying of self-doped nitrogen gel, 1g of chitosan was dissolved in 40ml of 5% acetic acid solution, 0.75g of agar was added, stirred at room temperature for 3 hours, and 40 microliters of glutaraldehyde solution was added to obtain Self-doped nitrogen gel, freeze-dried the self-nitrogen-doped gel at minus 40 degrees for 48 hours to obtain a dry self-doped nitrogen precursor;
[0035] Step 2) Activation and carbonization of the self-doped nitrogen gel, mix the dry self-doped nitrogen gel with the basic inorganic substance potassium hydroxide in a mass ratio of 1:2, add an appropriate amount of distilled water, stir at room temperature for 0.5 hours, and place in an oven at 85 degrees Celsius Dry for 12 hours to obtain an activated self-doped nitrogen precursor. Carbonize the self-doped nitrogen precursor in a nitrogen atmosphere...
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The invention discloses a self-doped nitrogen porous carbon material with a three-dimensional network structure, which is prepared from chitosan, agar, glutaraldehyde, mixed and stirred, freeze-dried, activated, carbonized, washed and dried, and has a three-dimensional network shape structure, its specific surface area is 1800~2200 m 2 g ‑1 . The preparation method includes: 1) preparation and drying of self-doped nitrogen gel; 2) activation and carbonization of self-doped nitrogen gel; 3) preparation of self-doped nitrogen porous carbon material with three-dimensional network structure. As the application of supercapacitor electrode material, the current density is 20~0.5 A / g, and the specific capacitance reaches 205.0~300.0 F / g. Compared with the technical problems such as complex synthesis process and long synthesis time in the prior art, the present invention uses the two-dimensional sheet structure of chitosan combined with the pore structure of agar to form a three-dimensional structure through cross-linking and protect it by freeze-drying technology to obtain High cycle stability, improved conductivity and specific capacitance, simplified synthesis process, and shortened synthesis time have broad application prospects in the field of supercapacitors.
Description
technical field [0001] The invention belongs to the field of electrochemical supercapacitors, and in particular relates to a preparation method and application of a self-doped nitrogen porous carbon material with a three-dimensional network structure. Background technique [0002] With the rapid growth of population and rapid economic development, the shortage of resources and energy has become one of the important problems to be solved urgently in contemporary society. Therefore, the development and application of clean and renewable energy plays a key role in national economic development and solving environmental problems. Electric energy, wind energy, solar energy, tidal energy, etc. have all received widespread attention, and finding a suitable energy storage device is a crucial link. [0003] Supercapacitor is a new type of energy storage device between traditional capacitors and rechargeable batteries. It has the advantages of high power density, long cycle life, fas...
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IPC IPC(8): C01B32/318C01B32/348H01G11/34
CPCH01G11/34C01B32/318C01B32/348Y02E60/13
Inventor 孙立贤印世璐徐芬王飞飞陈沛荣胡锦炀李晶华
Owner GUILIN UNIV OF ELECTRONIC TECH