Nitrogen and phosphorus in-situ doped carbon fiber electrode for supercapacitor and preparation and application thereof
A technology for supercapacitors and carbon fiber electrodes, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of easy loss and less doping of heteroatoms, so as to improve energy storage performance, increase specific surface area, The effect of improving electrochemical performance
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Embodiment 1
[0032] The desizing carbon fiber was oxidized with concentrated nitric acid at 100 °C for 2 h, and active groups such as carboxyl and hydroxyl groups were introduced on the surface of the carbon fiber. After washing and drying, the oxidized carbon fiber CFO was obtained. Weigh 0.4g of hexachlorocyclotriphosphazene (HCCP) into the reactor, then add 40mL of anhydrous acetonitrile, stir and dissolve, add 0.3g of CFO, then inject 3mL of triethylamine (TEA), seal immediately, sonicate at 40°C After 3 hours of reaction, the carbon fibers were taken out and washed with acetonitrile and tetrahydrofuran respectively to obtain HCCP-grafted carbon fibers (CFO-HCCP). Weigh 0.4g HCCP and 0.3g piperazine into the reactor, then add 75mL THF, stir and dissolve, add 0.3g CFO-HCCP, then inject 4mL TEA, immediately seal, 25 ℃ ultrasonic reaction for 1.5h, after standing for 24h The carbon fibers were taken out, extracted with acetonitrile for 12 h, and dried in vacuum to obtain polyphosphazene m...
Embodiment 2
[0034] The desizing carbon fiber was oxidized with concentrated nitric acid at 100 °C for 2 h, washed and dried to obtain oxidized carbon fiber CFO. Weigh 0.4 g of HCCP into the reactor, then add 40 mL of anhydrous acetonitrile, stir and dissolve, add 0.4 g of CFO, then inject 3 mL of TEA, seal it immediately, and after ultrasonic reaction at 40 °C for 3 h, take out the carbon fibers and wash them with acetonitrile and tetrahydrofuran respectively. HCCP-grafted carbon fibers (CFO-HCCP) were prepared. Weigh 0.5g HCCP and 1.0g polyethyleneimine (PEI) into the reactor, then add 75mL THF, stir and dissolve, add 0.4g CFO-HCCP, then inject 4mL TEA, seal immediately, 40 ℃ ultrasonic reaction for 2h, After standing for 18 h, the carbon fibers were taken out, extracted with acetonitrile for 12 h, and dried in vacuum to obtain polyphosphazene modified carbon fibers (CF-PZPEI). The CF-PZPEI was placed in a tube furnace for carbonization. Under the protection of inert gas, the temperatur...
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