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A kind of preparation method of co-ldh zinc-air battery catalyst of sheet structure

A zinc-air battery and sheet-like structure technology, applied in the field of zinc-air battery catalysts, can solve the problems of large specific surface area of ​​transition metal hydroxide, restricting the application of transition metal hydroxide, exposure of active sites, etc., so as to improve electrocatalysis The effect of activity, mild reaction conditions and high reaction efficiency

Active Publication Date: 2021-11-30
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the transition metal hydroxide has a large specific surface area, more active sites, and better contact with the electrolyte, which has good OER performance. However, it is unstable and prone to agglomeration. These shortcomings restrict the transition metal hydrogen Application of Oxide

Method used

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  • A kind of preparation method of co-ldh zinc-air battery catalyst of sheet structure
  • A kind of preparation method of co-ldh zinc-air battery catalyst of sheet structure
  • A kind of preparation method of co-ldh zinc-air battery catalyst of sheet structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.249g of cobalt acetate and 0.125g of hydrazine in 30mL of distilled water, stir at 25°C for 10min, and finally transfer to a polytetrafluoroethylene-lined stainless steel autoclave at 120°C for 6h, and wait for the reaction kettle to cool down to room temperature naturally , after being washed several times with water twice, put it in an oven and dry for 12h to obtain the pink intermediate product Co(OH) 2 ; 40mg of the above-mentioned pink intermediate product Co(OH) 2 Ultrasonic dispersion in 60mL methanol solution, after the dispersion is uniform, add 0.985g dimethylimidazole, stir for 30min, transfer to a polytetrafluoroethylene-lined reactor and keep at 100°C for 16h, wash with methanol for several times, and then dried in a vacuum oven to obtain lavender Co-LDH zinc-air battery catalyst. Depend on figure 1 It can be seen that the Co-LDH electrocatalyst prepared in this example is a two-dimensional nanosheet structure with a thickness between 5-10 nm. ...

Embodiment 2

[0026] Dissolve 0.249g of cobalt acetate and 0.063g of hydrazine in 30mL of distilled water, stir at 25°C for 10min, and finally transfer to a polytetrafluoroethylene-lined stainless steel autoclave at 120°C for 6h, and wait for the reaction kettle to cool naturally to room temperature , after being washed several times with water twice, put it in an oven and dry for 12h to obtain the pink intermediate product Co(OH) 2 , 40mg of the above pink intermediate product Co(OH) 2 Ultrasonic dispersion in 60mL methanol solution, after the dispersion is uniform, add 0.985g dimethylimidazole, stir for 30min, transfer to a polytetrafluoroethylene-lined reactor and keep at 100°C for 16h, wash with methanol for several times, and then dried in a vacuum oven to obtain lavender Co-LDH zinc-air battery catalyst.

Embodiment 3

[0028] Dissolve 0.249g of cobalt acetate and 0.125g of hydrazine in 30mL of distilled water, stir at 25°C for 10min, and finally transfer to a polytetrafluoroethylene-lined stainless steel autoclave at 120°C for 6h, and wait for the reaction kettle to cool down to room temperature naturally , after being washed several times with water twice, put it in an oven and dry for 12h to obtain the pink intermediate product Co(OH) 2 , 40mg of the above pink intermediate product Co(OH) 2 Ultrasonic dispersion in 60mL methanol solution, after the dispersion is uniform, add 0.493g dimethylimidazole, stir for 30min, then transfer to a polytetrafluoroethylene hydrothermal kettle and keep at 100°C for 16h, wash with methanol several times after the reaction is completed, Then dried in a vacuum oven to obtain lavender Co-LDH zinc-air battery catalyst.

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Abstract

The invention discloses a preparation method of a sheet-like Co-LDH zinc-air battery catalyst. Cobalt acetate and hydrazine are dissolved in distilled water, then transferred to a reaction kettle at 120°C for 6 hours, washed several times and then dried to obtain Co(OH) 2 And disperse in the alcohol solution to obtain the standby solution, then add dimethylimidazole, after reaching the chelation equilibrium, transfer the reaction solution to the reaction kettle and keep it at 100°C for 16h, wash the reaction product several times and dry to obtain the flaky structure Co‑LDH catalysts for zinc-air batteries with a thickness of 5‑10 nm. The bifunctional electrocatalyst with a core-shell structure in the present invention has a larger specific surface area, more active sites are exposed, and can better contact with the electrolyte, which can effectively improve the electrocatalytic activity of the bifunctional electrocatalyst.

Description

technical field [0001] The invention belongs to the technical field of zinc-air battery catalysts, and in particular relates to a preparation method of a sheet-like Co-LDH zinc-air battery catalyst. Background technique [0002] As a clean energy source, zinc-air battery has the advantages of high specific energy, low cost, and no pollution. It has experimental applications in many fields and has become a research hotspot in recent years. Catalyst is the core component in Zn-air battery, and it is also the key material that determines the cost and performance of the battery. In recent years, researches on catalysts for Zn-air batteries have emerged, however, the synthesis of bifunctional electrocatalysts for ORR and OER is still challenging. Therefore, the development of a bifunctional electrocatalyst has become one of the important problems to be solved in the field of zinc-air battery catalyst synthesis technology. [0003] Recently, the synthesis of many transition meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90B82Y30/00H01M12/06
CPCB82Y30/00H01M4/9016H01M12/06
Inventor 杨林谷佳莉王荷
Owner HENAN NORMAL UNIV
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