Preparation method of porous nano Co-nitrogen-carbon composite carbon felt
A composite carbon and nanotechnology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor battery performance and low electrochemical activity, and achieve the effect of low cost, easy availability of raw materials, and low cost
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Embodiment 1
[0033] In this example, the preparation method of Co@nitrogen-doped carbon composite carbon felt is as follows:
[0034] (1) Slice the carbon felt according to the specifications of 1×2.5cm and 2×2cm, and label (1×2.5cm for cyclic voltammetry test, 2×2cm for battery cycle test);
[0035] (2) Put the carbon felt into 200mL of 98% concentrated sulfuric acid, take it out after immersion for 10h, wash it with deionized water and absolute ethanol three times respectively, and then put it into an oven (60°C) to dry for later use;
[0036] (3) Dissolve 1.436g (4.9mmol) of cobalt nitrate hexahydrate in 100mL of methanol solvent to prepare a 4.9mol / L solution, and dissolve it with ultrasound for 10min;
[0037] Put the carbon felt in the above steps into methanol solution of cobalt nitrate hexahydrate, soak for 20 minutes and then magnetically stir for 15 minutes to obtain a mixed system;
[0038] (4) Dissolve 3.244g (39.5mmol) of 2-methylimidazole in 100mL of methanol solvent to form...
Embodiment 2
[0047] This embodiment prepares ZIF-67 composite carbon felt:
[0048] (1) Slice the carbon felt according to the specifications of 1×2.5cm and 2×2cm, and label (1×2.5cm for cyclic voltammetry test, 2×2cm for battery cycle test);
[0049](2) Put the carbon felt into 200mL of 98% concentrated sulfuric acid, take it out after immersion for 10h, wash it with deionized water and absolute ethanol three times respectively, and then put it into an oven (60°C) to dry for later use;
[0050] (3) Dissolve 1.436g (4.9mmol) of cobalt nitrate hexahydrate in 100mL of methanol solvent to prepare a 4.9mol / L solution, and dissolve it with ultrasound for 10min;
[0051] Put the carbon felt in the above steps into methanol solution of cobalt nitrate hexahydrate, soak for 20
[0052] After 1 min, stir magnetically for 15 min to obtain a mixed system;
[0053] (4) Dissolve 3.244g (39.5mmol) of 2-methylimidazole in 100mL of methanol solvent to form a 39.5mol / L solution, and stir magnetically for ...
Embodiment 3
[0061] The difference from Example 1 is:
[0062] After step (5) ends, enter step (6): carbon felt is placed on both ends of the porcelain boat, and then the porcelain boat is placed in a tube furnace. Under an argon atmosphere, the heating rate is 2°C / min from The room temperature was raised to 600°C and kept at 600°C for 2 hours to obtain porous nano-Co@nitrogen-carbon composite carbon felt.
[0063] The relevant performance data of the present embodiment are as follows:
[0064] At room temperature, the internal resistance of the all-vanadium redox flow battery equipped with Co@nitrogen-doped carbon composite carbon felt is 80mΩ. The performance of the battery in VRFB is much higher than that of the original carbon felt. Industrial development of vanadium redox flow batteries.
[0065] From figure 1 (e)(f) It can be seen that the Co@nitrogen-carbon structure has a uniform size distribution on the carbon felt and is better combined with the carbon felt, which almost chang...
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