Super-pure carbon aerogel with superhigh specific surface area based on air activating and pore forming and preparation method thereof
A carbon aerogel and pore-making technology, applied in the field of aerogel, can solve the problems of low specific surface area of carbon aerogel, increase cost and waste of raw materials, avoid high cost and danger, and optimize specific surface area characteristics. and microscopic pore characteristics, the effect of the integrity of the overall structure
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[0072] The present invention also provides a method for preparing carbon aerogel, including the following steps:
[0073] 1) After mixing the phenolic compound, aldehyde compound, organic basic catalyst and solvent, aging under airtight conditions to obtain a solid product;
[0074] 2) After drying the solid product obtained in the above steps, a phenolic polymer is obtained;
[0075] 3) After carbonization treatment and pore formation of the organogel obtained in the above steps, a carbon aerogel is obtained;
[0076] The carbonization treatment and activation pore formation include first carbonization treatment and then activation pore formation, or carbonization treatment and activation pore formation at the same time.
[0077] The selection, ratio and parameters of the raw materials or products in the above preparation method of the present invention, as well as the corresponding optimization principles, etc., unless otherwise specified, are the same as the raw material selection, r...
Embodiment 1
[0105] Take 0.5 g of resorcinol and slowly add it to 3.5 mL of formaldehyde solution. After stirring in a water bath at a constant temperature of 40°C for 10 minutes, add 0.005 g of hexamethylenetetramine, and pour 20 mL of ethanol solution at the same time, and stir well. Then, the obtained solution was sealed and placed in an oven at 80° C., and kept for 3 days for heat preservation and aging. Take out the aged phenolic gel polymer and place it in the air for natural drying for 5 hours. The phenolic gel was then dried in an oven at 80°C for 2 days. The completely dried phenolic gel is carbonized at 800°C for 2 hours in a high temperature furnace filled with argon. In order to further obtain a carbon aerogel with an ultra-high specific surface area, during the carbonization period, air was introduced at the same time, the air flow rate was 10 mL / min, and the continuous injection time was 8 minutes, to obtain an ultra-high specific surface area based on air activation pore for...
Embodiment 2
[0111] Take 0.5 g of resorcinol and slowly add it to 3.5 mL of acetaldehyde solution. After stirring in a water bath at a constant temperature of 40°C for 10 minutes, add 0.1 g of hexamethylenetetramine, and pour 50 mL of ethanol solution at the same time, and stir well. Then, the obtained solution was sealed and placed in an oven at 80° C., and kept warm for 7 days. Take out the aged phenolic gel polymer and place it in the air for natural drying for 5 hours. The phenolic gel was then dried in an oven at 80°C for 2 days. The completely dried phenolic gel was carbonized at 800°C for 2 hours in a high temperature furnace filled with argon. In order to further obtain a carbon aerogel with an ultra-high specific surface area, during the carbonization period, air was introduced at the same time, the air flow rate was 10 mL / min, and the continuous injection time was 8 minutes, to obtain an ultra-high specific surface area based on air activation pore formation Ultra-pure carbon ae...
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