Preparation method of nitrogen-doped porous carbon@cobalt-based catalyst nanocage composite material for lithium-oxygen battery
A nitrogen-doped porous carbon and cobalt-based catalyst technology is applied in fuel cell-type half-cells and secondary battery-type half cells, battery electrodes, nanotechnology, etc., and can solve the problems of low capacity, poor rate, and short cycle life. and other problems, to achieve the effect of high specific capacity, simple preparation process and low cost
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Embodiment 1
[0035] Weigh 50 mg of 2-methylimidazole and cobalt nitrate, respectively, and dissolve them in methanol so that their concentrations are both 20 mmol / L. The 2-methylimidazole solution was added dropwise to the metal cobalt salt solution at a rate of 100 mL / min, and then left to stand for 12 hours to form a bulk MOF. The resulting product was centrifuged, washed repeatedly with ethanol, and dried in vacuum at 60°C. Weigh 50mg bulk MOF into 60mmol / L cobalt nitrate / zinc methanol solution, in which the mass ratio of metal cobalt salt and metal zinc salt is 10:90, and the concentration of bulk MOF in the mixed solution is 10mg / mL. The reaction time at 100°C was 6 hours. The resulting product was then centrifuged, washed repeatedly with ethanol and then dried under vacuum at 60 °C to obtain a hollow MOF. Then carbonize at 800°C for 6 hours under nitrogen. Finally, it was activated under air at 300 °C for 4 hours to obtain a three-dimensional nitrogen-doped porous carbon@Co 3 o 4...
Embodiment 2
[0038] Weigh 50 mg of 2-methylimidazole and cobalt nitrate, respectively, and dissolve them in methanol so that their concentrations are both 80 mmol / L. The 2-methylimidazole solution was added dropwise to the metal cobalt salt solution at a rate of 5 mL / min, and then left to stand for 24 hours to form a block MOF. The resulting product was centrifuged, washed repeatedly with ethanol, and dried in vacuum at 60 °C. Weigh 30mg bulk MOF into 80mmol / L cobalt nitrate / zinc methanol solution, in which the mass ratio of metal cobalt salt and metal zinc salt is 90:10, and the concentration of bulk MOF in the mixed solution is 90mg / mL. The reaction time at 100°C was 6 hours. The resulting product was then centrifuged, washed repeatedly with ethanol and then dried under vacuum at 60 °C to obtain a hollow MOF. Then carbonize at 600°C for 6 hours under nitrogen. Finally, it was activated under air at 300 °C for 4 hours to obtain a three-dimensional nitrogen-doped porous carbon@Co 3 o 4...
Embodiment 3
[0041] Weigh 50 mg of 2-methylimidazole and cobalt chloride, respectively, and dissolve them in methanol so that their concentrations are both 40 mmol / L. The 2-methylimidazole solution was added dropwise to the metal cobalt salt solution at a rate of 30 mL / min, and then left to stand for 1 hour to form a block MOF. The resulting product was centrifuged, washed repeatedly with ethanol, and then dried in vacuum at 60 °C. Weigh 20 mg of bulk MOF into 20 mmol / L cobalt chloride / zinc ethanol solution, wherein the mass ratio of metal cobalt salt and metal zinc salt is 50:50, and the concentration of bulk MOF in the mixed solution is 60 mg / mL. The reaction time was 6 hours at 100°C. The resulting product was then centrifuged, washed repeatedly with ethanol and then dried under vacuum at 60 °C to obtain a hollow MOF. Then carbonize at 1000°C for 1 hour under nitrogen. Finally, it was activated under air at 300 °C for 4 hours to obtain a three-dimensional nitrogen-doped porous carbon@...
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