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Preparation method and application of CoO/NiOOH composite material

A technology of composite materials and reactors, which is applied in the field of nanomaterials, can solve the problems of slow charge transmission, ion diffusion and insulation performance limitations, and achieve the effects of large porosity, good cycle stability and good electrochemical performance

Active Publication Date: 2020-06-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, charge transport between electrolytes and electroactive cobalt species is limited by slow ion diffusion and insulating properties in conventional dense electrodes.

Method used

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  • Preparation method and application of CoO/NiOOH composite material
  • Preparation method and application of CoO/NiOOH composite material
  • Preparation method and application of CoO/NiOOH composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method and application of a CoO / NiOOH composite material, comprising the following steps:

[0031] In the first step, 1mmol Co(NO 3 ) 2 ·6H 2 O, 1mmol 2-methylimidazole was dissolved in 40mL methanol respectively, the two solutions were quickly mixed, and slowly mixed into a purple uniform solution under vigorous stirring,

[0032] In the second step, put the mixed purple solution into an autoclave for hydrothermal reaction, the hydrothermal reaction temperature is 80°C, and the reaction time is 6h. The precipitate after the reaction is washed with ethanol, dried in vacuum at 60°C for 12h, and then Calcined under nitrogen, the calcination temperature is 350°C, the calcination time is 2h, and the heating rate is 5°C·min -1 , get CoO

[0033] In the third step, add 10mg CoO obtained in the S2 process to 100mL water, stir evenly, and add 2mmol NiSO under vigorous stirring 4 ·6H 2 O, 2 mmol K 2 S 2 o 8 To form a uniform suspension, add ammonia water d...

Embodiment 2

[0039] A preparation method and application of a CoO / NiOOH composite material, comprising the following steps:

[0040] In the first step, 1mmol Co(NO 3 ) 2 ·6H 2 0, 2mmol 2-methylimidazole were dissolved in 40mL methanol respectively, the two solutions were quickly mixed, and slowly mixed into a homogeneous solution under vigorous stirring,

[0041] In the second step, put the mixed purple solution into an autoclave for hydrothermal reaction, the hydrothermal reaction temperature is 80°C, and the reaction time is 6h. The precipitate after the reaction is washed with ethanol, dried in vacuum at 60°C for 12h, and then Calcined under nitrogen, the calcination temperature is 350°C, the calcination time is 2h, and the heating rate is 5°C·min -1 , get CoO

[0042] In the third step, add 10mg CoO obtained in the S2 process to 100mL water, stir evenly, and add 2mmol NiSO under vigorous stirring 4 ·6H 2 O, 2 mmol K 2 S 2 o 8 To form a uniform suspension, add ammonia water dro...

Embodiment 3

[0045] A preparation method and application of a CoO / NiOOH composite material, comprising the following steps:

[0046] In the first step, 1mmol Co(NO 3 ) 2 ·6H 2 O, 1mmol 2-methylimidazole was dissolved in 40mL methanol respectively, the two solutions were quickly mixed, and slowly mixed into a homogeneous solution under vigorous stirring,

[0047] In the second step, put the mixed purple solution into an autoclave for hydrothermal reaction, the hydrothermal reaction temperature is 100°C, and the reaction time is 6h. The precipitate after the reaction is washed with ethanol, dried in vacuum at 60°C for 12h, and then Calcined under nitrogen, the calcination temperature is 350°C, the calcination time is 2h, and the heating rate is 5°C·min -1 , get CoO

[0048] In the third step, add 15mg CoO obtained in the S2 process to 100mL water, stir evenly, and add 2mmol NiSO under vigorous stirring 4 ·6H 2 O, 2 mmol K 2 S 2 o 8 To form a uniform suspension, add ammonia water dro...

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Abstract

The invention relates to a preparation method of a CoO / NiOOH composite material. The preparation method comprises the following steps: S1, dissolving a soluble cobalt salt in methanol to obtain a methanol solution of the cobalt salt; dissolving 2-methylimidazole in methanol to obtain a methanol solution of 2-methylimidazole; mixing the methanol solution of the cobalt salt and the methanol solutionof the 2-methylimidazole under a stirring condition to obtain a uniform solution; S2, putting the uniform solution into a reaction kettle for hydrothermal reaction, and washing, drying and calciningprecipitates obtained by the hydrothermal reaction under a protective atmosphere condition to obtain CoO; s3, adding the CoO obtained in the step S2 into water; adding nickel sulfate and K2S2O8 underthe stirring condition to form a uniform suspension, then dropwise adding ammonia water into the uniform suspension to adjust the pH value of the solution to 9.5-10.5, heating, reacting under the stirring condition, and washing and drying the precipitate after the reaction to obtain the CoO / NiOOH composite material. Compared with the prior art, the method has the advantages of environmental friendliness, simple preparation method, convenience in large-scale production and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method and application of a CoO / NiOOH composite material. Background technique [0002] The growing shortage of fossil fuels has driven the development of sustainable and renewable energy sources, environmentally friendly energy conventions and storage systems for efficient use of energy. Supercapacitors are considered as promising energy storage devices due to their high power density, fast charging and discharging, and long cycle life, especially in terms of specific energy and power. Cobalt-based materials such as cobalt oxides and hydroxides are considered ideal electrodes for supercapacitors due to their high electrochemical activity and theoretical capacitance. However, charge transport between electrolytes and electroactive cobalt species is limited by slow ion diffusion and insulating properties in conventional dense electrodes. [0003] Cobalt monox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/86
CPCH01G11/46H01G11/86
Inventor 韩生胡晓敏马健刘顺昌王露露蒋继波孙瑶馨陈宇凯
Owner SHANGHAI INST OF TECH