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A kind of preparation method of cobalt sulfide/carbon nano catalyst of rechargeable zinc-air battery

A carbon nano and cobalt sulfide technology, applied in the field of nano materials, can solve the problems of poor reversibility and poor stability of precious metals, and achieve the effects of simple preparation process, improved electrocatalytic properties, and reduced energy loss

Active Publication Date: 2020-10-02
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the above existing technologies such as poor stability and poor reversibility of noble metals, the present invention provides a novel porous catalyst, which not only solves the deficiencies in the stability of noble metals, but also has the porosity and active sites on the surface of the catalyst. The synergistic effect between supports greatly improves energy utilization and conversion efficiency in rechargeable Zn-air batteries

Method used

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  • A kind of preparation method of cobalt sulfide/carbon nano catalyst of rechargeable zinc-air battery
  • A kind of preparation method of cobalt sulfide/carbon nano catalyst of rechargeable zinc-air battery
  • A kind of preparation method of cobalt sulfide/carbon nano catalyst of rechargeable zinc-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh zinc nitrate and cobalt nitrate according to the molar ratio of zinc nitrate and cobalt nitrate being 7:3 (5.1 moles in total) and dissolve them in 80ml of methanol solution until they dissolve evenly (the color is red at this time); Dissolve 3.7 grams of methylimidazole in 80 ml of methanol, and wait until it dissolves evenly. The methanol solution containing metal ions zinc and cobalt and the methanol solution of organic dimethylimidazole were mechanically mixed together (the color was blue at this time), stirred with a magnet at room temperature for 24 hours, and the mixed solution gradually became cloudy from clear. Stop stirring after 24 hours, let stand for a period of time, there is a blue precipitate at the bottom of the beaker, and the color of the precipitate becomes lighter with the increase of zinc ions. The bottom precipitate was centrifuged and dried to obtain the precursor. According to the mass ratio of the precursor and the sulfur powder is 20:1,...

Embodiment 2

[0045]Weigh zinc nitrate and cobalt nitrate according to the molar ratio of zinc and cobalt as 4:1 (2 moles in total), and dissolve them in 8 grams of deionized water, and weigh 22.7 grams of dimethylimidazole and dissolve them in 80 grams of deionized water , and the aqueous solution of the above metal ions and the aqueous solution of organic ligand dimethylimidazole were mechanically mixed and magnetically stirred for 12 hours, centrifuged, and dried in an oven at 60 degrees to obtain a precursor. Weigh it according to the ratio of 10:1 of the mass of precursor and sulfur powder and put it in the roasting crucible, pass high-purity nitrogen gas, use the program to raise the temperature to 850 degrees, keep it for 150 minutes, and then carry out the program at 10 degrees per minute Cool down, take out the sample when the temperature of the tube furnace drops to room temperature, treat it with a hydrochloric acid solution with a concentration of 1.0 molar, soak it for 5 hours, ...

Embodiment 3

[0047] The composite material prepared in Example 1 was tested.

[0048] The powder diffraction pattern of cobalt sulfide / carbon nanocomposite is characterized by MiniFlex II powder diffractometer;

[0049] The scanning electron microscope image of the cobalt sulfide / carbon nanocomposite is characterized by a JSM-6700 scanning electron microscope;

[0050] The transmission electron microscope image of the cobalt sulfide / carbon nanocomposite was characterized by a Tecnai G2F20 transmission electron microscope;

[0051] The nitrogen isotherm adsorption curve analysis of cobalt sulfide / carbon nanocomposites is characterized by ASAP2020M adsorption instrument;

[0052] The battery data of the cobalt sulfide / carbon nanocomposite is obtained through the blue point battery test system.

[0053] figure 1 It is the acid stability test chart of the composite material prepared in Example 1. In the figure, untreated refers to the composite material that has not been treated with acid,...

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Abstract

The invention relates to a cobalt sulfide / carbon nanometer composite material preparation method and a product obtained through the method. The method comprises: 1) mixing a cobalt salt, a zinc salt and dimethyl imidazole to obtain a precursor; 2) calcining sulfur powder and the precursor obtained in the step 1) in an inert gas at a temperature of 600-1000 DEG C; and 3) mixing the calcined productobtained in the step 2) and an acid. According to the present invention, the composite material can be used as the reversible zinc-air battery positive catalyst material, wherein the energy utilization rate and the conversion efficiency are substantially improved by using the small size effect and the surface effect of the cobalt sulfide nanometer material, the in-situ organic compounding of thecobalt sulfide nanoparticles and the carbon material, and the porosity and the high graphitization degree of the surface of the carbon material in the charge and discharge process of the reversible zinc-air battery.

Description

technical field [0001] The invention mainly relates to the technical field of nanometer materials, and relates to the application of a highly active nanometer carbon material as a high-efficiency dual-function electrocatalyst in new energy devices. Background technique [0002] China, as a major energy-consuming country dominated by coal, has become particularly prominent in environmental issues while its economy and society are developing rapidly. Green energy and new energy storage and conversion methods have always been the goals pursued by various countries. In recent years, rechargeable metal-air batteries, as a way of electrochemical energy storage and conversion, have attracted more and more attention due to their advantages of low cost, environmental friendliness, and high safety. [0003] At present, among the cathode materials of batteries, rare noble metals (platinum) have the best catalytic properties and high energy utilization and conversion efficiency due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/90H01M4/88H01M12/06B82Y30/00
CPCB82Y30/00H01M4/8605H01M4/8647H01M4/8828H01M4/9083H01M12/06Y02E60/10
Inventor 李扬张华彬康遥张健
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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