An in situ growth surface coordination polymerization for the preparation of hollow CO 3 o 4 nanosphere method
A technology of coordination polymerization and in-situ growth, applied in nanotechnology, electrochemical generators, structural parts, etc., can solve the problems of poor rate performance, low electron diffusion rate, accelerated capacity decay, etc., and achieve excellent electrochemical performance. Effect
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Embodiment 1
[0027] Preparation of Hollow Co by Surface Coordination Polymerization by In Situ Growth 3 o 4 The method of nanosphere, concrete steps are as follows:
[0028] (1) Weigh 10mmol of cobalt nitrate hexahydrate, 20mmol of urea and 2mmol of sodium citrate and dissolve them in 50ml of pure water, then transfer the mixed solution to a 100ml high-pressure reactor, and react at a constant temperature of 95°C for 4h, and the reaction ends Afterwards, the product was collected, washed, and dried to obtain precursor A with a particle size of about 5 μm.
[0029] (2) Weigh 0.1g of precursor A and 5g of 2-methylimidazole and disperse them in 20ml of ethylene glycol, then add 40ml of pure water, stir and react at room temperature for 1 hour, collect the product after the reaction, wash, and dry to obtain the precursor Body B, the particle size is about 400nm.
[0030] (3) Precursor B was calcined in an air atmosphere, the heating rate was 1°C / min, the calcination temperature was 250°C, a...
Embodiment 2
[0037] Preparation of Hollow Co by Surface Coordination Polymerization by In Situ Growth 3 o 4 The method of nanosphere, concrete steps are as follows:
[0038] (1) Weigh 10mmol of cobalt chloride hexahydrate, 10mmol of urea and 1mmol of sodium citrate and dissolve them in 50ml of ultrapure water, then transfer the mixed solution to a 100ml autoclave, and react at a constant temperature of 100°C for 8h, After the reaction, the product was collected, washed, and dried to obtain precursor A with a particle size of about 30 μm.
[0039] (2) Weigh 0.1g of precursor A and 2g of 2-methylimidazole and disperse them in 20ml of glycerol, then add 20ml of pure water, stir and react at room temperature for 3h, collect the product after the reaction, wash and dry to obtain the precursor Body B, the particle size is about 270nm;
[0040] (3) will Co 3 o 4 The precursor is calcined, the heating rate is 2°C / min, the calcination temperature is 300°C, the calcination time is 2h, and the c...
Embodiment 3
[0043] Preparation of Hollow Co by Surface Coordination Polymerization by In Situ Growth 3 o 4 The method of nanosphere, concrete steps are as follows:
[0044] (1) Weigh 10mmol of cobalt sulfate heptahydrate, 40mmol of urea and 4mmol of sodium citrate and dissolve them in 50ml of ultra-pure water, then transfer the mixed solution to a 100ml autoclave, and react at a constant temperature of 110°C for 2h. After the end, the product was collected, washed, and dried to obtain precursor A with a particle size of about 20 μm.
[0045] (2) Weigh 0.1g of precursor A and 10g of 2-methylimidazole and disperse them in 20ml of ethyl acetate, then add 80ml of pure water, stir and react at room temperature for 0.5h, collect the product after the reaction, wash, and dry to obtain Precursor B, the particle size is about 80nm;
[0046] (3) will Co 3 o 4 The precursor is calcined, the heating rate is 5°C / min, the calcination temperature is 350°C, the calcination time is 1h, and the calcin...
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