A kind of porous carbon airgel fiber all-solid supercapacitor and preparation method thereof
A technology for supercapacitors and carbon aerogels, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of high cost, difficulty in expansion, and complicated preparation methods, and achieve low cost, simple operation, and easy preparation method fast effect
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Embodiment 1
[0039] (1) Using N,N-dimethylacetamide as a solvent, add 4,4'-diaminodiphenyl ether and pyromellitic anhydride in an ice-water bath for condensation polymerization in an equimolar ratio to prepare a solid content 15% polyamic acid. The specific process is as follows: Dissolve 8.0096g of 4,4'-diaminodiphenyl ether in 95.57g of N,N-dimethylacetamide, add 8.86g of pyromellitic anhydride, and react in an ice-water bath for 5h. Then, 4.0476 g of triethylamine was added, and the reaction was continued for 3 hours to prepare a water-soluble polyamic acid solution with a solid content of 15%. The prepared water-soluble polyamic acid is precipitated with deionized water, and then washed and freeze-dried to obtain a dry silk of the water-soluble polyamic acid for use.
[0040] (2) Take 1g graphene oxide and dissolve it in 20mL deionized water to prepare 50mg mL -1 of aqueous solution. Ultrasonic 6h. Take 0.5 g of water-soluble polyamic acid dry silk and add it to the graphene oxide ...
Embodiment 2
[0044] The mass of the polyamic acid in Example 1 was changed to 0.25 g, and the prepared graphene oxide and polyamic acid hydrogel were designated as GP-4. The prepared carbon aerogel is designated as RGP-4. The assembled carbon airgel fiber all-solid-state supercapacitor is denoted as RGP-4SC, and the rest are the same as in Example 1.
[0045] image 3 (a) and (b) can be seen as a uniformly distributed pore structure, which is the pore structure left after the sublimation of ice crystals during the freeze-drying process, and the pore structure is well maintained after carbonization. image 3 (c) and (d) can see the cross-linked porous structure, which is produced by freeze-drying to remove ice crystals after the cross-linked network of graphene oxide and polyamic acid is formed, and the network pore structure is well maintained after carbonization .
[0046] When the mass ratio of graphene oxide to polyamic acid is 4:1, the carbon airgel fiber electrode obtained in this ex...
Embodiment 3
[0050] The mass of polyamic acid in Example 1 was changed to 0.16g, and the prepared graphene oxide and polyamic acid hydrogel were designated as GP-6. The prepared carbon aerogel is designated as RGP-6. The assembled carbon airgel fiber all-solid-state supercapacitor is denoted as RGP-6SC, and the rest are the same as in Example 1. at 0.4mA cm -2 Under the current density, the area specific capacity of the RGP-6SC fiber all-solid supercapacitor is 24.25mF cm -2 .
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