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Method for preparing hierarchical porous nano carbon materials

A nano-carbon material and product technology, applied in the field of materials, can solve the problems of low power density, low material utilization rate, poor conductivity, etc., and achieve the effect of reasonable pore size distribution, precise control of pore size distribution, and high conductivity

Inactive Publication Date: 2013-01-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, activated carbon materials have poor electrical conductivity, concentrated pore size distribution, and are all micropores, resulting in relatively low power density and low material utilization.

Method used

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  • Method for preparing hierarchical porous nano carbon materials
  • Method for preparing hierarchical porous nano carbon materials
  • Method for preparing hierarchical porous nano carbon materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1), preparation of organosol: 90g resorcinol and 0.84g potassium nitrate are dissolved in the formaldehyde solution of 120ml (concentration 38%), add 11.1ml (molar concentration 0.05mol / L) Na 2 CO 3 And the deionized water of 125ml (wherein the mol ratio of resorcinol, formaldehyde and potassium nitrate is 1: 2: 0.01; The mol ratio of resorcinol and carbonic sodium carbonate is 1: 0.00068; The consumption of deionized water is total 60% of the mass), stirred at a speed of 120 rpm for half an hour, and sealed;

[0038] (2), put the organosol prepared in step (1) into a 50°C incubator for one day, 70°C for one day, and 90°C for three days for aging to prepare an organic airgel;

[0039] (3) Dry the above gel in a vacuum oven for 10 hours at 80°C and 0.01 bar;

[0040] (4), under the condition that the temperature rises to 600°C at a rate of 3°C / min in a mixed atmosphere of nitrogen and carbon dioxide gas with a molar ratio of 10:1, and then is kept at a constant temper...

Embodiment 2

[0047] (1), 80g resorcinol and 0.367g potassium nitrate are dissolved in the formaldehyde solution of 105ml (concentration 38%), add 15ml (molar concentration 0.05mol / L) Na 2 CO 3 and 110ml of deionized water (wherein the mol ratio of resorcinol, formaldehyde, potassium nitrate, sodium carbonate and deionized water is 1: 2: 0.005), (wherein the mol ratio of resorcinol, formaldehyde and potassium nitrate 1: 2: 0.005; the mol ratio of resorcinol and sodium carbonate is 1: 0.001; the consumption of deionized water is 66% of the total mass), stirred at a speed of 300 rpm for half 20 minutes, and sealed;

[0048] (2), put the organosol prepared in step (1) into a thermostat at 45°C for one day, and then aging at 85°C for four days to prepare the organoaerogel;

[0049](3) Dry in a vacuum oven for 10 hours at 80°C and 0.01 bar;

[0050] (4) Under the conditions of constant temperature for 3 hours after rising to 700°C at a rate of 3°C / min under a mixed atmosphere of nitrogen and c...

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Abstract

The invention belongs to the technical field of materials, in particular to a method for preparing hierarchical porous nano carbon materials. The method comprises the following steps of: (1) preparing organosol; (2) aging the organosol prepared in the step (1) to prepare an organic aerogel; (3) vacuumizing the organic aerogel prepared in the step (2), keeping constant temperature and drying; (4) performing primary carbonization on a product prepared in the step (3); (5) performing ball milling on a product prepared in the step (4); (6) soaking a product prepared in the step (5) in a mixed acid solution, washing until the pH value is 6 to 7, filtering, vacuumizing, keeping constant temperature and drying; (7) adding a KOH solid and deionized water into a product prepared in the step (6) for mixing to obtain a paste, vacuumizing, keeping constant temperature and drying; and (8) performing secondary carbonization on a product prepared in the step (7). By the method, the specific surface area of a carbon aerogel material can be obviously increased, the pore diameter distribution is improved, and the specific capacitance and high-power charge-discharge performance of a carbon aerogel electrode material are improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a method for preparing nanometer carbon materials. Background technique [0002] The industrial development driven by petrochemical energy for a century has degraded the earth's environment and over-exploited resources. In order to achieve sustainable development, it is particularly important to use clean and green energy systems. In the national medium and long-term technological development outline, supercapacitor electrode materials and preparation technology are included in the research category of cutting-edge new material technology as an important part. Supercapacitors have the remarkable characteristics of high specific power, and are indispensable auxiliary devices for battery systems, showing their prominence in electric vehicles, computer digital products, and national defense industries. Especially in electric vehicles, as an auxiliary device for lithium-ion batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00C01B32/15
Inventor 沈军刘冬刘念平
Owner TONGJI UNIV
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