Preparation method of porous carbon aerogel with super-high specific surface area
A technology of ultra-high specific surface area and carbon airgel, which is applied in the direction of electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., to achieve good cycle stability, simple preparation process, and high specific capacity.
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[0022] Example 1
[0023] 1) Drop an aqueous solution of l-type carrageenan with a mass fraction of 2% into an ethanol solution of ferric chloride with a concentration of 1M and wash with deionized water to prepare a carrageenan-iron hydrogel.
[0024] 2) Preparation of carrageenan-iron hydrogel into aerogel by freeze drying;
[0025] 3) Carrageenan-iron aerogel is calcined at 400°C for 1 hour in a tube furnace under an argon atmosphere to obtain a carbon aerogel-iron sulfide nanocomposite;
[0026] 4) Remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite with a 2M hydrochloric acid aqueous solution to obtain a carbon aerogel;
[0027] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800°C for 1 hour in a nitrogen atmosphere. Obtain a super high specific surface porous carbon deposition aerogel;
[0028] 6) Use an electrochemical workstation an...
Example Embodiment
[0029] Example 2
[0030] 1) Drop an aqueous solution of l-type carrageenan with a mass fraction of 2% into an ethanol solution of ferric chloride with a concentration of 1M and wash with deionized water to prepare a carrageenan-iron hydrogel.
[0031] 2) Preparation of carrageenan-iron hydrogel into aerogel by freeze drying;
[0032] 3) Carrageenan-iron aerogel is calcined at 300°C for 1 hour in a tube furnace under an argon atmosphere to obtain a carbon aerogel-iron sulfide nanocomposite;
[0033] 4) Remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite with a 2M hydrochloric acid aqueous solution to obtain a carbon aerogel;
[0034] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800°C for 1 hour in a nitrogen atmosphere. Obtain a super high specific surface porous carbon deposition aerogel;
[0035] 6) Use an electrochemical workstation an...
Example Embodiment
[0036] Example 3
[0037] 1) Drop an aqueous solution of l-type carrageenan with a mass fraction of 2% into an ethanol solution of ferric chloride with a concentration of 1M and wash with deionized water to prepare a carrageenan-iron hydrogel.
[0038] 2) Preparation of carrageenan-iron hydrogel into aerogel by freeze drying;
[0039] 3) Carrageenan-iron aerogel is calcined at 500°C for 1 hour in a tube furnace under argon atmosphere to obtain carbon aerogel-iron sulfide nanocomposite;
[0040] 4) Remove the iron sulfide in the carbon aerogel-iron sulfide nanocomposite with a 2M hydrochloric acid aqueous solution to obtain a carbon aerogel;
[0041] 5) The carbon aerogel is activated with potassium hydroxide, and the mass ratio of potassium hydroxide to the carbon aerogel is 4:1. The activation process is calcination at 800°C for 1 hour in a nitrogen atmosphere. Obtain a super high specific surface porous carbon deposition aerogel;
[0042] 6) Use an electrochemical workstation and a b...
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