Preparation and Application of Cobalt Nitrogen Co-doped Porous Carbon Microspheres
A co-doped, porous carbon technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor cycle stability, poor methanol tolerance, limited fuel cells, and high price, and achieves favorable material diffusion and The effect of electron transport, low preparation cost, and controllable conditions
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Embodiment 1
[0024] Prepare 1wt% sodium alginate aqueous solution, and add it into the syringe, use 3wt% cobalt nitrate aqueous solution as the receiving solution, in the environment where the output voltage of the high-voltage power supply is 25KV, the distance between the needle and the receiving device is 10cm, and the flow rate is 2mL / h The gel microspheres were obtained by electrospinning by electrospinning machine under the condition. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;
[0025] The above microspheres were placed in a 0.15 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed several times with absolute ethanol and deionized water, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;
[0026] The cobalt alginate / ZIF-67 airgel was raised to 600°C at ...
Embodiment 2
[0028] Prepare 2wt% sodium alginate aqueous solution and add it into the syringe, use 6wt% cobalt nitrate aqueous solution as the receiving liquid, the output voltage of the high-voltage power supply is 15KV, the distance between the needle and the receiving device is 5cm, and the flow rate is 0.5mL / h Under certain conditions, electrospinning was used to electrospray to obtain gel microspheres. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;
[0029] The above microspheres were placed in a 0.3 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed with absolute ethanol and deionized water for several times, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;
[0030] The cobalt alginate / ZIF-67 airgel was raised to 600°C at a heating rate of 5°C / min in a ...
Embodiment 3
[0032] Prepare 3wt% sodium alginate aqueous solution and add it into the syringe, use 9wt% cobalt nitrate aqueous solution as the receiving liquid, the output voltage of the high-voltage power supply is 30KV, the distance between the needle and the receiving device is 5cm, and the flow rate is 0.5mL / h Under certain conditions, electrospinning was used to electrospray to obtain gel microspheres. After standing for 12 h, the microspheres were washed twice with absolute ethanol and deionized water, respectively. Put the above microspheres into a freeze dryer to freeze-dry to obtain cobalt alginate microspheres;
[0033] The above microspheres were placed in 0.45 mol / L methanol solution of 2-methylimidazole and stirred at room temperature for 12 hours, washed with absolute ethanol and deionized water for several times, and then freeze-dried to obtain cobalt alginate / ZIF-67 gas gel;
[0034] The cobalt alginate / ZIF-67 airgel was raised to 600°C at a heating rate of 5°C / min in a n...
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