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Method for preparing high-specific-surface-area macroporous-mesoporous carbon by using salt template, and applications of high-specific-surface-area macroporous-mesoporous carbon

A high specific surface area, mesoporous carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of easy residue, increased operation difficulty, raw material cost, cumbersome template processing process, etc., and achieves low price Effect

Active Publication Date: 2019-04-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies successfully prepared macroporous and mesoporous carbon materials by using the hard template method, but at the same time involved tedious follow-up template treatment process, such as MgO template removal requires the use of HCl, which brings the disadvantage of metal Mg2 +, halogen Cl- are very easy to remain; and the removal of SBA-15 mesoporous templates, silicon spheres and PS sphere macroporous templates requires the use of highly toxic HF
Not only that, the macroporous or mesoporous templates used at this stage need to be synthesized in advance, which further increases the difficulty of operation and the cost of raw materials

Method used

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  • Method for preparing high-specific-surface-area macroporous-mesoporous carbon by using salt template, and applications of high-specific-surface-area macroporous-mesoporous carbon
  • Method for preparing high-specific-surface-area macroporous-mesoporous carbon by using salt template, and applications of high-specific-surface-area macroporous-mesoporous carbon
  • Method for preparing high-specific-surface-area macroporous-mesoporous carbon by using salt template, and applications of high-specific-surface-area macroporous-mesoporous carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 1 g of gelatin in 20 mL of deionized water, heat up to 80 °C, wait until the gelatin is completely dissolved, stir to make it evenly dispersed, then add 0.25 g of sodium nitrate, stir to dissolve to form a homogeneous sol, and cool to room temperature.

[0042] The above sol was placed in a constant temperature box at 4 °C for 12 h to form a hydrogel, and then placed at -20 °C for 12 h, and then immersed in liquid nitrogen for 1-5 min to obtain a jelly.

[0043] The jelly was placed in a freeze dryer and vacuum freeze-dried for 36 h to obtain an aerogel.

[0044] The airgel was placed in a tube furnace, fed with argon, raised to 800 °C at a rate of 5 °C / min, and kept at 800 °C for 1 h, and cooled to room temperature naturally to obtain a black carbonized product.

[0045] Collect the black carbonized product, put it in a beaker, add deionized water, stir and wash for 2 h, filter with suction, wash, and dry to obtain the final product, which is marked as C-0.25-800....

Embodiment 2

[0048] Take 1 g of gelatin in 20 mL of deionized water, heat up to 80 °C, until the gelatin is completely dissolved, stir to disperse evenly, then add 0.5 g of sodium nitrate, stir to dissolve to form a homogeneous sol, and cool to room temperature.

[0049] The above sol was placed in a constant temperature box at 4 °C for 12 h to form a hydrogel, and then placed at -20 °C for 12 h, and then immersed in liquid nitrogen for 1-5 min to obtain a jelly.

[0050] The jelly was placed in a freeze dryer and vacuum freeze-dried for 36 h to obtain an aerogel.

[0051] The airgel was placed in a tube furnace, fed with argon, raised to 800 °C at a rate of 5 °C / min, and kept at 800 °C for 1 h, and cooled to room temperature naturally to obtain a black carbonized product.

[0052] Collect the black carbonized product, put it in a beaker, add deionized water, stir and wash for 2 h, filter with suction, wash, and dry to obtain the final product, which is marked as C-0.5-800.

[0053] The m...

Embodiment 3

[0055] Take 1 g of gelatin in 20 mL of deionized water, heat up to 80 °C, wait until the gelatin is completely dissolved, stir to disperse evenly, then add 0.75 g of sodium nitrate, stir to dissolve to form a homogeneous sol, and cool to room temperature.

[0056] The above sol was placed in a constant temperature box at 4 °C for 12 h to form a hydrogel, and then placed at -20 °C for 12 h, and then immersed in liquid nitrogen for 1-5 min to obtain a jelly.

[0057] The jelly was placed in a freeze dryer and vacuum freeze-dried for 36 h to obtain an aerogel.

[0058] The airgel was placed in a tube furnace, fed with argon, raised to 800 °C at a rate of 5 °C / min, and kept at 800 °C for 1 h, and cooled to room temperature naturally to obtain a black carbonized product.

[0059] Collect the black carbonized product, put it in a beaker, add deionized water, stir and wash for 2 h, filter with suction, wash, and dry to obtain the final product, which is marked as C-0.75-800.

[0060...

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Abstract

The invention discloses a method for preparing a high-specific-surface-area macroporous-mesoporous carbon material by using a salt template. The method comprises: dissolving biomass gelatin in hot water to form a sol, adding an inorganic salt as a templating agent, cooling to a room temperature, placing in a 4 DEG C constant-temperature box to form a hydrogel, and continuously placing at a temperature of -20 DEG C to form a frozen gel; carrying out freeze drying on the frozen gel to obtain an aerogel, and calcining at a temperature of 400-1000 DEG C under an argon atmosphere to obtain a blackcarbonized product; and carrying out water washing, suction filtration and drying to obtain the final product. According to the present invention, by using the soluble biomass carbon source and the inorganic salt as the raw materials, the method is simple, the cost is low, the poorly soluble metal template is not used, the acid washing is not required, no residual metal impurity exists, and the method is environmentally friendly; the prepared carbon material has characteristics of high specific surface area (2872 cm<2> / g), three-dimensional continuous property, rich macropores (50-150 nm) andmesopores (2-4 nm), nitrogen atom doping and the like; and with the application of the material in 4V ionic liquid supercapacitors, the energy density of 92 Wh / kg and the excellent power density can be provided.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and relates to a preparation method of a high specific area macropore-mesoporous carbon material. Background technique [0002] Porous carbon materials have broad application prospects in the fields of adsorbents, supercapacitors, rechargeable secondary batteries, and fuel cells. At present, commercial porous carbon materials are often obtained by high-temperature activation of strong alkaline KOH activators. The carbon sources used are mostly solid blocks. Before high-temperature activation, processes such as cleaning, crushing, carbonization pretreatment, and ball-milling activator mixing are required. Subsequent processes It also involves the pickling step of corrosion pollution. The process is cumbersome and complicated, and it is not environmentally friendly, and because the activator and carbon source are solid, it is difficult to ensure uniform mixing and full activation. The prep...

Claims

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Application Information

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IPC IPC(8): C01B32/318C01B32/336
CPCC01B32/318C01B32/336Y02E60/13
Inventor 储伟李敬骞伟中
Owner SICHUAN UNIV
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