A hollow structure co 3 o 4 Nanomaterials and their preparation methods
A nanomaterial, hollow structure technology, applied in cobalt oxide/cobalt hydroxide and other directions, can solve the problems of low coulombic efficiency of nanomaterials, complex preparation method, poor cycle stability, etc. The effect of the ability to store electric charge
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Embodiment 1
[0037] The hollow structure Co of this embodiment 3 o 4 A method for preparing a nanomaterial, comprising the steps of:
[0038] 1) Slowly add 0.39g of sodium citrate, 0.1g of zinc nitrate, and 0.1g of HMT into 50mL of water, stir well, put the reaction solution into a water bath and heat slowly, raise the temperature to 90°C, and react for 0.5h. After the reaction is over, let it cool naturally to room temperature, filtered, washed with distilled water, and put the solid obtained by the reaction into an oven at 70°C to dry to obtain zinc citrate powder;
[0039]2) Take the zinc citrate powder prepared in step 1), and disperse it into 20ml of 1mol / L cobalt nitrate solution under ultrasonic conditions, and let it stand for 3 days; filter, wash with distilled water, and put the solid obtained from the reaction into Dry in an oven at 70°C;
[0040] 3) Calcinate the solid powder obtained in step 2) at 400°C for 1 hour, cool naturally to room temperature, then disperse the obtai...
Embodiment 2
[0042] The hollow structure Co of this embodiment 3 o 4 The preparation method of material, comprises the steps:
[0043] 1) Slowly add 0.2g of sodium citrate, 0.05g of zinc nitrate, and 0.1g of HMT into 50mL of water, stir well, put the reaction solution into a water bath and heat slowly, raise the temperature to 90°C, and react for 0.5h. After the reaction is over, let it cool naturally to room temperature, filtered, washed with distilled water, and put the solid obtained by the reaction into an oven at 70°C to dry to obtain zinc citrate powder;
[0044] 2) Take the zinc citrate powder prepared in step 1), and disperse it into 20ml of 1mol / L cobalt nitrate solution under ultrasonic conditions, and let it stand for 3 days; filter, wash with distilled water, and put the solid obtained from the reaction into Dry in an oven at 70°C;
[0045] 3) Calcinate the solid powder obtained in step 2) at 500°C for 0.5h, cool naturally to room temperature, then disperse the obtained powd...
Embodiment 3
[0047] The hollow structure Co of this embodiment 3 o 4 The preparation method of material, comprises the steps:
[0048] 1) Slowly add 0.39g of sodium citrate, 0.2g of zinc nitrate, and 0.1g of HMT into 50mL of ethanol, stir evenly, put the reaction solution into a water bath and heat slowly, raise the temperature to 90°C, and react for 0.5h. Cool to room temperature, filter, wash with distilled water, put the solid obtained from the reaction into a 70-degree oven and dry to obtain zinc citrate powder;
[0049] 2) Take the zinc citrate powder prepared in step 1), and disperse it into 50ml of 1mol / L cobalt nitrate solution under ultrasonic conditions, and let it stand for 3 days; filter, wash with distilled water, and put the solid obtained from the reaction into Dry in an oven at 70°C;
[0050] 3) Calcinate the solid powder obtained in step 2) at 300°C for 6 hours, cool naturally to room temperature, then disperse the obtained powder into 6mol / L NaOH solution, let it stand...
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