Cobaltosic oxide hierarchical structure nano array materials and preparation method thereof, and application of cobaltosic oxide hierarchical structure nano array materials

Abstract

The present invention provides cobaltosic oxide hierarchical structure nano array materials and a preparation method thereof, and an application of cobaltosic oxide hierarchical structure nano array materials. In a closed high temperature and high pressure reactor, redistilled water is taken as reaction solvent, cobalt salt, ammonium fluoride and urea are added into the reaction solvent for uniform mixing, and a reaction system is heated to generate a high-pressure environment to prepare cobaltous hydroxide precursor nanowire materials; then redistilled water is taken as reaction solvent, 2-methylimidazole is added into the reaction solvent, the cobaltous hydroxide precursor loaded on carbon cloth is immersed in the solution, the cobaltous hydroxide is taken as a cobalt source, the reaction system is heated and the reaction time is controlled to control a ZIF67 nucleation rate so as to prepare a cobalt-based metal organic framework (ZIF67) array; and finally, calcining decomposition ofthe cobalt-based metal organic framework (ZIF67) array is performed to obtain a cobaltosic oxide hierarchical structure. The product purity is high, the dispersibility is good, the controllability isgood, the production cost is low, the reproducibility is good, the cobaltosic oxide hierarchical structure nano array materials have cycling stability and large active surface area, and have a potential application value at the aspect of supercapacitors.

Description

technical field

[0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a hierarchical structure nanoarray material of tricobalt tetroxide, a preparation method and an application thereof. Background technique

[0002] With the consumption of fossil energy and the deterioration of the environment, new technologies related to effective, clean and sustainable energy and energy storage have become an urgent need. A supercapacitor is a new type of energy storage device between rechargeable batteries and traditional capacitors. In the electrochemical energy storage process, the supercapacitor is only used as an electrochemical element, and no chemical reaction occurs. This energy storage process is reversible, so the supercapacitor can be charged and discharged repeatedly.

[0003] However, nanomaterials with traditional structures often exhibit unsatisfactory supercapacitive performance, so further increasing the specific surface...

Examples

Embodiment 1

[0033] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0034] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0035] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 120°C for 6 hours, took out the reactor and cooled it to room temperature naturally, washed it with ethanol and double distilled water in turn, cleaned it, and dried it at room temperature to obtain the cobalt hydroxide precursor loaded on the carbon cloth. The SEM image is as follows figure 1 As shown, it can be seen from the figure that the material is a nanowire array material uniformly grown on the carbon cloth;

[0036] S3: Dissolve 3g of 2-methyl...

Embodiment 2

[0042] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0043] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0044] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 120°C for 6h, took out the reactor and cooled it down to room temperature naturally, rinsed it with ethanol and double distilled water in sequence, and dried it at room temperature to obtain the cobalt hydroxide precursor supported on the carbon cloth.

[0045] S3: Dissolve 5g of 2-methylimidazole in 20ml of deionized water, then add the cobalt hydroxide precursor supported on the carbon cloth, then transfer to a 50ml autoclave, and then heat the autocl...

Embodiment 3

[0049] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0050] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0051] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 90°C for 6h, took out the reactor and cooled it down to room temperature naturally, rinsed it with ethanol and double distilled water in sequence, and dried it at room temperature to obtain a cobalt hydroxide precursor supported on carbon cloth.

[0052] S3: Dissolve 5g of 2-methylimidazole in 20ml of deionized water, then add the cobalt hydroxide precursor supported on the carbon cloth, then transfer to a 50ml autoclave, and then heat the autoclave at ...

technical field

[0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a hierarchical structure nanoarray material of tricobalt tetroxide, a preparation method and an application thereof. Background technique

[0002] With the consumption of fossil energy and the deterioration of the environment, new technologies related to effective, clean and sustainable energy and energy storage have become an urgent need. A supercapacitor is a new type of energy storage device between rechargeable batteries and traditional capacitors. In the electrochemical energy storage process, the supercapacitor is only used as an electrochemical element, and no chemical reaction occurs. This energy storage process is reversible, so the supercapacitor can be charged and discharged repeatedly.

[0003] However, nanomaterials with traditional structures often exhibit unsatisfactory supercapacitive performance, so further increasing the specific surface...

Examples

Embodiment 1

[0033] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0034] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0035] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 120°C for 6 hours, took out the reactor and cooled it to room temperature naturally, washed it with ethanol and double distilled water in turn, cleaned it, and dried it at room temperature to obtain the cobalt hydroxide precursor loaded on the carbon cloth. The SEM image is as follows figure 1 As shown, it can be seen from the figure that the material is a nanowire array material uniformly grown on the carbon cloth;

[0036] S3: Dissolve 3g of 2-methyl...

Embodiment 2

[0042] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0043] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0044] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 120°C for 6h, took out the reactor and cooled it down to room temperature naturally, rinsed it with ethanol and double distilled water in sequence, and dried it at room temperature to obtain the cobalt hydroxide precursor supported on the carbon cloth.

[0045] S3: Dissolve 5g of 2-methylimidazole in 20ml of deionized water, then add the cobalt hydroxide precursor supported on the carbon cloth, then transfer to a 50ml autoclave, and then heat the autocl...

Embodiment 3

[0049] A preparation method of tricobalt tetroxide hierarchical structure nano-array material, comprising the following steps:

[0050] S1: Calcining the carbon cloth at 450°C for 2 hours in 0.2MKMnO 4 Soak in the solution for 1 hour. ;

[0051] S2: Mix 40mL double-distilled water, 1mmol cobalt nitrate hexahydrate, 2mmol ammonium fluoride and 5mmol urea evenly, then add it into a 50mL reaction kettle, soak the treated carbon cloth in the mixture, pour it into the reaction kettle, and tighten the lid of the kettle , reacted at 90°C for 6h, took out the reactor and cooled it down to room temperature naturally, rinsed it with ethanol and double distilled water in sequence, and dried it at room temperature to obtain a cobalt hydroxide precursor supported on carbon cloth.

[0052] S3: Dissolve 5g of 2-methylimidazole in 20ml of deionized water, then add the cobalt hydroxide precursor supported on the carbon cloth, then transfer to a 50ml autoclave, and then heat the autoclave at ...

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