Preparation method of nano-carbon material airgel composite electrode material supported by nickel foam
A composite electrode and nickel foam technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of poor electrical properties of nanotube-modified graphene aerogels, so as to facilitate charge transfer and improve The effect of improving specific capacitance and hydrophobic properties
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specific Embodiment approach 1
[0016] Specific embodiment one: the preparation method of the carboxylated carbon nanotube / graphene airgel / foam nickel composite electrode material of the present embodiment, carry out according to the following steps:
[0017] 1. Preparation of carboxylated carbon nanotubes: carbon nanotubes are treated with sulfuric acid and nitric acid to obtain carboxylated carbon nanotubes;
[0018] 2. Preparation of graphene airgel: Disperse graphene oxide in deionized water to prepare a graphene oxide dispersion with a mass concentration of 1-5 mg / mL, and then adjust the pH of the graphene oxide dispersion to 8 with ammonia water ~9, then add ascorbic acid as a reducing agent to obtain a mixed solution; stir the mixed solution in an oil bath at a temperature of 80-100°C for 20-24 hours to obtain a graphene hydrogel, and then freeze-dry the graphene hydrogel , to obtain graphene airgel;
[0019] Three, according to the mass ratio of carboxylated carbon nanotubes and graphene airgel is 1...
specific Embodiment approach 2
[0021] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the specific preparation method of the carboxylated carbon nanotubes in step one is: mixing concentrated sulfuric acid and concentrated nitric acid aqueous solution to obtain a mixed solution; wherein the sulfuric acid in the mixed solution The concentration of nitric acid is 12mol / L, and the concentration of concentrated nitric acid is 9mol / L; then add carbon nanotubes to the mixture, stir magnetically in an oil bath at 60-80°C for 24-36h, then separate, and wash the solid phase with water until the pH value is 5-6, and then dry to obtain carboxylated carbon nanotubes; others are the same as the first embodiment.
specific Embodiment approach 3
[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the ratio of the volume of ascorbic acid in step two to the mass of graphene oxide in the graphene oxide dispersion is 1 mL: (30-50) mg; The specific embodiment 1 or 2 are the same.
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