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Preparation method of graphene-loaded Co3O4 nano-crystal composite material and application of graphene-loaded Co3O4 nano-crystal composite material in air negative electrode of zinc-air battery

A technology of cobalt trioxide nanometer and composite materials, which is applied in the direction of battery electrodes, fuel cell half-cells and secondary battery-type half-cells, nanotechnology, etc., can solve the problems of poor conductivity, reduce quality, improve electrode performance, The effect of increasing the preparation speed

Inactive Publication Date: 2018-04-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a transition metal oxide, Co3O3 nanocrystals have poor electrical conductivity and are easy to agglomerate, which limits the further improvement of its electrocatalytic performance.

Method used

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  • Preparation method of graphene-loaded Co3O4 nano-crystal composite material and application of graphene-loaded Co3O4 nano-crystal composite material in air negative electrode of zinc-air battery
  • Preparation method of graphene-loaded Co3O4 nano-crystal composite material and application of graphene-loaded Co3O4 nano-crystal composite material in air negative electrode of zinc-air battery
  • Preparation method of graphene-loaded Co3O4 nano-crystal composite material and application of graphene-loaded Co3O4 nano-crystal composite material in air negative electrode of zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A certain amount of graphene oxide is ultrasonically dispersed in 17mL deionized water to obtain a 1mg / mL graphene oxide dispersion, and 1mL of 1mol / L cobalt nitrate solution and 1mL of 0.5mol / L sodium nitrate solution are added to the graphene oxide dispersion Add 8mL of ammonia water dropwise to the above mixture, mechanically stir for 4h, transfer the above mixture to the reaction kettle, react at 185°C for 12h, and wash the obtained black precipitate with deionized water and absolute ethanol After washing three times and drying for a period of time, the graphene-supported cobalt tetroxide nanocrystal composite material with exposed {112} crystal faces is obtained, and its XRD pattern is as follows: figure 1 shown.

[0038] Add 3mg of the product to 0.03mL Nafion solution and 1mL isopropanol, disperse evenly by ultrasonic, drop the resulting slurry onto the pretreated carbon paper, and obtain the air cathode electrode sheet of zinc-air battery after drying.

Embodiment 2

[0040] Ultrasonic disperse a certain amount of graphene oxide in 22mL deionized water to obtain a 0.5mg / mL graphene oxide dispersion, add 0.5mL 1mol / L cobalt nitrate solution and 1mL 0.5mol / L sodium nitrate solution to graphene oxide In the dispersion liquid, mix evenly at room temperature; add 2mL of ammonia water dropwise to the above mixed liquid, mechanically stir for 4h, transfer the above mixed liquid to the reaction kettle, react at 185°C for 12h, and wash the obtained black precipitate with deionized water, without After washing with water and ethanol for three times and drying for a period of time, the graphene-supported cobalt tetroxide nanocrystal composite material with exposed {100} crystal faces was obtained.

[0041] Add 2mg of the product to 0.02mL Nafion solution and 1mL isopropanol, disperse evenly by ultrasonic, drop the resulting slurry onto the pretreated carbon paper, and obtain the air cathode electrode sheet of zinc-air battery after drying.

Embodiment 3

[0043] A certain amount of graphene oxide was ultrasonically dispersed in 23mL deionized water to obtain a 1.5mg / mL graphene oxide dispersion, and 1mL of 0.5mol / L cobalt nitrate solution and 0.5mL 1mol / L sodium nitrate solution were added to graphene oxide In the dispersion liquid, mix evenly at room temperature; add 2mL of ammonia water dropwise to the above mixed liquid, mechanically stir for 4h, transfer the above mixed liquid to the reaction kettle, react at 185°C for 12h, and wash the obtained black precipitate with deionized water, without After washing with water and ethanol for three times and drying for a period of time, the graphene-supported cobalt tetroxide nanocrystal composite material with exposed {111} crystal planes was obtained.

[0044] Add 4mg of the product to 0.04mL Nafion solution and 1mL isopropanol, disperse evenly by ultrasonic, drop the resulting slurry onto the pretreated carbon paper, and obtain the air cathode electrode sheet of zinc-air battery af...

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Abstract

The invention relates to a preparation method of a graphene-loaded Co3O4 nano-crystal composite material and application of the graphene-loaded Co3O4 nano-crystal composite material in an air negativeelectrode of a zinc-air battery. The preparation method comprises the steps of performing ultrasonic dispersion on graphene oxide in deionized water to obtain a graphene oxide suspension liquid; adding a cobalt salt solution and a sodium salt solution into the graphene oxide suspension liquid, and uniformly mixing the mixed liquid; adding ammonia water into the mixed liquid to obtain a cobalt ammonia complex solution; performing hydrothermal processing on the obtained mixed solution under sealing to obtain black precipitant; sequentially washing the black precipitant with deionized water andabsolute ethyl alcohol, and performing drying under an air atmosphere to obtain the graphene-loaded Co3O4 nano-crystal; mixing the material, an organic solvent and a binding agent, and obtaining pasteafter ultrasonic dispersion; and uniformly and dropwise attaching the paste onto carbon paper after being pre-processed, and obtaining an air negative pole plate after drying. The method is simple, is economic and environmental-friendly, is low in cost, is convenient to operate and has relatively good industrial application value.

Description

technical field [0001] The invention belongs to the field of electrocatalysis of metal-air batteries, and in particular relates to a preparation method of an air cathode material of an efficient and cheap rechargeable zinc-air battery. Background technique [0002] At present, problems such as the fossil energy crisis and climate warming are becoming more and more severe, and finding alternative energy sources has become a top priority. Zinc-air batteries have attracted more and more attention due to their high theoretical energy density and power density, low cost, easy availability, safety and environmental protection. Zinc-air batteries are mainly composed of three parts: zinc metal anode, air cathode and separator. Among them, the main problem for the commercialization of rechargeable zinc-air batteries is to find a bifunctional catalyst that efficiently catalyzes the oxygen reduction reaction and oxygen evolution reaction that occur at the air cathode. [0003] Spinel...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/08B82Y40/00
CPCB82Y40/00H01M4/8647H01M4/8828H01M4/9016H01M4/9083H01M12/08Y02E60/10
Inventor 邓意达何国威胡文彬何宇钟澄韩晓鹏张金凤
Owner TIANJIN UNIV