Zinc-nitrogen modified dual-carbon catalytic material, preparation method thereof and application of zinc-nitrogen modified dual-carbon catalytic material in zinc-air battery

A technology of double carbon catalytic material and porous carbon material, which can be used in fuel cell type half cells and secondary cell type half cells, carbon preparation/purification, battery electrodes, etc., and can solve the complex mixing process and complex synthesis process. , high risk factor and other problems, to achieve the effect of improving ORR capability, good conductivity and low price

Active Publication Date: 2021-10-01
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been some studies on modifying carbon materials with heteroatoms. In the Chinese patent (CN112397733A), the carbon source is dissolved in an organic solvent, and an organic cobalt salt is added. In the second step, the carbon source is also dissolved in an organic solvent, and inorganic iron is added. Salt, using the method of electrospinning to obtain iron-cobalt-supported nitrogen-doped carbon materials, but its synthesis process is relatively complicated and the cost is high
Chinese patent (CN111554945A) metal salt and nitrogen source (dopamine, urea) are stirred and distributed evenly in the aqueous solution, further makes water volatilize, and the mixing process of this method is comparatively complicated
Chinese patent (CN111889114A) uses hydrogen reduction technology to construct a carbon-coated nano-CoFe alloy catalyst with a shell-core structure. The Co and Fe elements obtained by this method are highly dispersed in the bimetallic organic framework with a porous structure, which avoids the formation of nano-CoFe alloys. Agglomeration is conducive to the full exposure of electrochemical active sites, but the process uses hydrogen reduction, which has a high risk factor

Method used

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  • Zinc-nitrogen modified dual-carbon catalytic material, preparation method thereof and application of zinc-nitrogen modified dual-carbon catalytic material in zinc-air battery
  • Zinc-nitrogen modified dual-carbon catalytic material, preparation method thereof and application of zinc-nitrogen modified dual-carbon catalytic material in zinc-air battery
  • Zinc-nitrogen modified dual-carbon catalytic material, preparation method thereof and application of zinc-nitrogen modified dual-carbon catalytic material in zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Zinc nitrate hexahydrate (1.0g) and dimethylimidazole (0.7g) were respectively dissolved in 50mL of methanol, and the dissolved dimethylimidazole was poured into zinc nitrate hexahydrate, and after stirring for 5 minutes, there was a white suspension Appeared, moved to 30 ° C environment for 12 h, centrifuged and washed to obtain ZIF-8. Put the prepared ZIF-8 in a quartz boat, place it in a tube furnace, and blow it with argon, at 5°C min -1 The heating rate was increased to 900°C, and kept at 900°C for 2h, and finally cooled to room temperature naturally to obtain a black solid powder; the powder (1g) was mixed with cyanamide (0.7g) and sucrose (0.05g), and the ball milling speed was mixed 240r min -1 , the ball milling time is 0.5h, the mixed sample is placed in a quartz boat, placed in a tube furnace, filled with argon, and heated at 5°C min -1 The heating rate was raised to 500°C for annealing, and kept at 500°C for 5 hours, then 5°C min -1 The heating rate was i...

Embodiment 2

[0037] Zinc nitrate hexahydrate (1.0g) and dimethylimidazole (0.5g) were respectively dissolved in 50mL of methanol, and the dissolved dimethylimidazole was poured into zinc nitrate hexahydrate, and after stirring for 5 minutes, there was a white suspension Appeared, moved to 40 ° C environment for 12 h, centrifuged and washed to obtain ZIF-8. Put the prepared ZIF-8 in a quartz boat, place it in a tube furnace, blow it with argon, and heat it at 3°C ​​min -1 The heating rate was raised to 700°C, and kept at 700°C for 1h, and finally cooled to room temperature naturally to obtain a black solid powder; the powder (1g) was mixed with dibenzylcyanamide (0.5g) and fructose (0.03g), The mixing speed of the ball mill is 220 rpm -1 , the ball milling time is 1h, the mixed sample is placed in a quartz boat, placed in a tube furnace, and heated at 3°C ​​min -1 The heating rate was raised to 400°C for annealing, and kept at 400°C for 5 hours, followed by 3°C min -1 The heating rate wa...

Embodiment 3

[0040] Zinc nitrate hexahydrate (1.0g) and dimethylimidazole (0.9g) were respectively dissolved in 50mL of methanol, and the dissolved dimethylimidazole was poured into zinc nitrate hexahydrate, and after stirring for 5 minutes, there was a white suspension appeared, moved to the environment of 20°C and stood still for 12 hours, then centrifuged and washed to obtain ZIF-8. Put the prepared ZIF-8 in a quartz boat, place it in a tube furnace, feed it with argon, and heat it at 4°C min -1 The heating rate was increased to 800°C, and kept at 800°C for 3h, and finally cooled to room temperature naturally to obtain a black solid powder; the powder (1g) was mixed with dimethylcyanamide. (1g) and glucose (0.08g), the mixing speed of the ball mill is 220r min -1 , the ball milling time is 1h, the mixed sample is placed in a quartz boat, placed in a tube furnace, and heated at 4°C min -1 The heating rate is raised to 650°C for annealing, and kept at 650°C for 3 hours, then 4°C for min...

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Abstract

The invention discloses a zinc-nitrogen modified dual-carbon catalytic material, a preparation method thereof and an application of the zinc-nitrogen modified dual-carbon catalytic material in a zinc-air battery. The preparation method comprises the following steps: synthesizing a metal framework ZIF-8 from dimethylimidazole and a zinc salt as raw materials, carrying out first heat treatment on the metal framework ZIF-8 in a protective atmosphere to obtain a zinc-modified porous carbon material, carrying out ball milling mixing on the zinc-modified porous carbon material, a carbohydrate compound and a nitrogen source compound, carrying out second heat treatment in a protective atmosphere, and obtaining the zinc-nitrogen modified dual-carbon catalytic material. The catalytic material has zinc and nitrogen dual modification, is rich in defect and porous structure, is good in conductivity and has a 3D network structure, and when the catalytic material is applied to a zinc-air battery, high power density and specific capacity are obtained; and the preparation method of the catalytic material is low in cost, simple in step and beneficial to industrial production.

Description

technical field [0001] The invention relates to a zinc-air battery electrode material, in particular to a zinc-nitrogen modified double-carbon catalytic material, and also relates to its preparation method and the application of the zinc-nitrogen modified double-carbon catalytic material in a zinc-air battery, belonging to zinc-air Technical field of battery catalytic materials. Background technique [0002] Rechargeable zinc-air batteries have attracted increasing attention due to their high theoretical energy density, low cost, environmental friendliness, and high safety. Zn-air batteries are driven by the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during discharge and charge, respectively. However, the sluggish kinetics of ORR and OER on air cathodes greatly limit the commercial application of Zn-air batteries. [0003] Noble metal catalysts (such as platinum, ruthenium, iridium, etc.) are considered to be effective electrocatalysts for oxygen r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/96H01M12/08
CPCC01B32/05H01M4/96H01M12/08Y02E60/50
Inventor 吴天景邓文辉景明俊李广黄鹤球
Owner XIANGTAN UNIV
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