Metal organic framework and nanofiber derived carbon-based composite electrode material and preparation method thereof
A metal-organic framework and nanofiber technology, which can be used in hybrid capacitor electrodes, hybrid/electric double-layer capacitor manufacturing, etc., can solve the problems of less MOFs load, uneven distribution, and unfavorable fiber surface growth, and achieve a stable and controllable structure. Effect
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[0035] See figure 1 , a method for preparing a carbon-based composite electrode material derived from a metal-organic framework and nanofibers as shown in an embodiment of the present invention, comprising the following steps:
[0036] S1, adding polyacrylonitrile, polyvinylpyrrolidone and metal salts to the first solvent, stirring and dissolving to obtain a spinning solution;
[0037] S2. Electrospinning the spinning solution to obtain a nanofiber membrane, and drying the nanofiber membrane for 10-15 hours;
[0038] S3. Dissolving the organic ligand in the second solvent to obtain a 0.05-0.2mol / L organic ligand solution, soaking 150-300mg of the nanofiber membrane in 50-100mL of the organic ligand solution for 1-3min;
[0039] S4. Add an equal volume of 0.5-1.0 mol / L metal salt solution to the organic ligand solution, shake for 2-10 minutes, and then let it stand for 40-80 minutes to generate MOFs in situ on the surface of the nanofiber membrane;
[0040] S5, drying the nan...
Embodiment 1
[0050] Dissolve 2.1 g of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP) and zinc acetate in 10 mL of N,N dimethylformamide (DMF) at a mass ratio of 1:1:1, mix and stir for 24 h, pass Nanofiber membranes were prepared by electrospinning, and dried at 60°C for 12 hours for use. Electrospinning parameters are as follows: voltage 16KV, spinning solution flow rate 1mL / h, receiving distance 16cm, temperature 25°C, humidity 50%.
[0051] Immerse 150mg of nanofiber membrane in 50mL aqueous solution containing 0.1mol / L 2-methylimidazole for 2min, then add 50mL aqueous solution containing 0.8mol / L zinc nitrate, shake for 5min and then let it stand for 1h, the surface of nanofiber membrane The MOFs were generated in situ, washed three times with deionized water, and dried at 60 °C for 12 h. Then put into the tube furnace at N 2 In the atmosphere, the rate was increased to 280 °C for 2 h at a rate of 2 °C / min, and then the rate was increased to 800 °C for 2 h at a rate of 5 °C / min ...
Embodiment 2
[0053] Dissolve 2.1 g of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP) and cobalt acetate in a mass ratio of 1:1:1 in 10 mL of N,N dimethylformamide (DMF) and mix and stir for 24 hours. Nanofiber membranes were prepared by electrospinning, and dried at 60°C for 12 hours for use. Electrospinning parameters are as follows: voltage 16KV, spinning solution flow rate 1mL / h, receiving distance 16cm, temperature 25°C, humidity 50%.
[0054] Immerse 150mg of nanofiber membrane in 50mL aqueous solution containing 0.1mol / L 2-methylimidazole for 2min, then add 50mL aqueous solution containing 0.8mol / L cobalt nitrate, shake for 5min and then let it stand for 1h. The MOFs were generated in situ, washed three times with deionized water, and dried at 60 °C for 12 h. Then put into the tube furnace at N 2 In the atmosphere, the rate was increased to 280 °C for 2 h at a rate of 2 °C / min, and then the rate was increased to 800 °C for 2 h at a rate of 5 °C / min to obtain a CNF@Co-NC compos...
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