A zinc-nitrogen modified double-carbon catalytic material, its preparation method and its application in zinc-air batteries

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

Active Publication Date: 2022-07-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 moisture 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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  • A zinc-nitrogen modified double-carbon catalytic material, its preparation method and its application in zinc-air batteries
  • A zinc-nitrogen modified double-carbon catalytic material, its preparation method and its application in zinc-air batteries
  • A zinc-nitrogen modified double-carbon catalytic material, its preparation method and its application in zinc-air batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Zinc nitrate hexahydrate (1.0g) and dimethylimidazole (0.7g) were dissolved in 50mL of methanol respectively, 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 for 12 h, centrifuged and washed to obtain ZIF-8. The prepared ZIF-8 was placed in a quartz boat, placed in a tube furnace, filled with argon, and heated at 5 °C for min. -1 The heating rate was increased to 900 °C, and the temperature was kept at 900 °C for 2 h, and finally cooled to room temperature naturally to obtain a black solid powder; 240r min -1 , the ball milling time is 0.5h, the mixed sample is placed in a quartz boat, placed in a tube furnace, and argon gas is introduced, and the temperature is 5 °C for min. -1 The heating rate was increased to 500 °C for annealing, and the temperature was kept at 500 °C for 5 h, followed by 5 °C min -1 The heating rate was increased to 1000 °C for anneal...

Embodiment 2

[0037] Zinc nitrate hexahydrate (1.0g) and dimethylimidazole (0.5g) were dissolved in 50mL of methanol respectively, 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 for 12 h, centrifuged and washed to obtain ZIF-8. The prepared ZIF-8 was placed in a quartz boat, placed in a tube furnace, filled with argon, and heated at 3 °C for min. -1 The heating rate was increased to 700 ° C, and kept at 700 ° C for 1 h, and finally cooled to room temperature naturally to obtain a black solid powder; the powder (1 g) was mixed with dibenzyl cyanamide (0.5 g) and fructose (0.03 g), The ball mill mixing speed is 220r min -1 , the ball milling time is 1h, and the mixed sample is placed in a quartz boat, placed in a tube furnace, and heated at 3°C ​​for min. -1 The heating rate was increased to 400 °C for annealing, and the temperature was kept at 400 °C for 5 h, followed by 3 °C m...

Embodiment 3

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

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Abstract

The invention discloses a zinc-nitrogen modified double-carbon catalytic material, a preparation method thereof, and an application in a zinc-air battery. Using dimethylimidazole and zinc salts as raw materials to synthesize metal frame ZIF-8, the metal frame ZIF-8 is subjected to the first heat treatment in a protective atmosphere to obtain zinc-modified porous carbon materials, and zinc-modified porous carbon materials are combined with sugar compounds. After mixing with nitrogen source compounds by ball milling, a second heat treatment is performed in a protective atmosphere to obtain a zinc-nitrogen modified double-carbon catalytic material; the catalytic material has zinc-nitrogen double modification, is rich in defects and porous structure, and has good electrical conductivity and It has a 3D network structure and is applied to a zinc-air battery to obtain high power density and specific capacity; the preparation method of the catalytic material has low cost, simple steps, and is 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, a preparation method thereof and the application of the zinc-nitrogen modified double-carbon catalytic material in a zinc-air battery, belonging to zinc-air batteries The technical field of battery catalytic materials. Background technique [0002] Rechargeable zinc-air batteries have received increasing attention due to their high theoretical energy density, low cost, environmental friendliness, and high safety. Zinc-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] Precious metal catalysts (such as platinum, ruthenium, iridium, etc.) are considered to be effective electrocatalysts for oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(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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