Method for preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst

A dual-functional catalyst, nickel-cobalt sulfide technology, applied in the direction of fuel cell half-cells and secondary battery-type half-cells, battery electrodes, circuits, etc., can solve the problem of insufficient catalytic performance of electrocatalysts and achieve excellent charging Effects of discharge performance and stability, improvement of electronic conductivity, and effective ion contact angle

Active Publication Date: 2019-10-15
YUNCHENG UNIVERISTY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the catalytic performance of the electrocatalyst in the prior art is not high enough, the present invention provides a method for

Method used

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  • Method for preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst
  • Method for preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst
  • Method for preparing nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst

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Embodiment 1

[0027] A preparation method of a nickel-cobalt sulfide / graphene composite material zinc-air battery bifunctional catalyst, comprising the following steps:

[0028] The first step: Weigh cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea with a mass ratio of 2:1:0.5, and dissolve them in a mixed solution of distilled water and isopropanol, the volume ratio of distilled water and isopropanol 1:3, the above mixed solution was stirred evenly, and ultrasonically dispersed for 1 hour; then the resulting mixture was transferred to an autoclave and sealed, and reacted in an environment of 140°C for 12 hours. After the autoclave was naturally cooled to room temperature, the resulting precipitate was collected. The material was washed three times with distilled water and absolute ethanol, and then vacuum-dried at 70°C for 8-12 hours; then, calcined at 450°C for 3 hours, cooled naturally to room temperature, and ground into powder to obtain NiCo 2 o 4 Precursor;

[0029] Ste...

Embodiment 2

[0036] The first step: take by weighing cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea with a mass ratio of 2:1:0.5, and dissolve it in a mixed solution of distilled water and isopropanol, the volume ratio of distilled water and isopropanol is 1:3, the above mixed solution was stirred evenly, ultrasonically dispersed for 1 hour, then the resulting mixture was transferred to an autoclave and sealed, and reacted at 140°C for 8, 10, 12, and 14 hours. After the autoclave was naturally cooled to room temperature, collected The resulting precipitate was washed three times with distilled water and absolute ethanol, and dried in vacuum at 70°C for 8-12 hours; after drying, it was calcined at 450°C for 3 hours; after natural cooling to room temperature, it was ground into powder to obtain NiCo 2 o 4 Precursor.

[0037] Step 2: Weigh the precursor NiCo with a mass ratio of 1:4:0.05 2 o 4 , sodium sulfide nonahydrate and graphene, dissolved in distilled water; after s...

Embodiment 3

[0040] Preparation method of nickel-cobalt sulfide / graphene composite zinc-air battery bifunctional catalyst with different mass ratios:

[0041] The first step: take by weighing cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea with a mass ratio of 2:1:0.5, and dissolve it in a mixed solution of distilled water and isopropanol, the volume ratio of distilled water and isopropanol is 1:3, the above mixed solution was stirred evenly, ultrasonically dispersed for 1 hour, then the resulting mixture was transferred to an autoclave and sealed, and reacted at 140°C for 12 hours. After the autoclave was naturally cooled to room temperature, the resulting precipitate was collected and washed with distilled water After washing with absolute ethanol for 3 times, vacuum-dry at 70°C for 8-12 hours; after drying, calcinate at 450°C for 3 hours, cool naturally to room temperature and grind into powder to obtain NiCo 2 o 4 Precursor;

[0042] Step 2: Weigh the precursor NiCo w...

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Abstract

The invention discloses a method for preparing a nickel-cobalt sulfide/graphene composite zinc-air battery bifunctional catalyst, and belongs to the field of preparation and application of new energybatteries. The preparation method comprises the following steps of firstly, the preparation of a precursor NiCo2O4: weighing cobalt nitrate hexahydrate, nickel nitrate hexahydrate and urea in a certain mass ratio, dissolving the same in a mixed solution of distilled water and isopropanol, uniformly stirring the mixture ultrasonically dispersing the mixture, sealing the product in a high-pressure vessel for a reaction, naturally cooling the product and collecting the precipitate, washing, drying and calcining the product at a high temperature, naturally cooling the product to the room temperature and grinding the product into a powder; secondly, the preparation of the catalyst: weighing the precursor NiCo2O4, sodium sulfide nonahydrate and graphene in a certain mass ratio, dissolving the same in distilled water, uniformly stirring the mixture at room temperature, ultrasonically dispersing the mixture, sealing the product in the high-pressure vessel for a reaction, collecting the black precipitate, washing, drying and calcining the product, naturally cooling the product to the room temperature and grinding the product into a powder. The catalyst has high oxygen reduction performanceand high oxygen evolution performance in the air electrode.

Description

technical field [0001] The invention belongs to the field of preparation and application of new energy batteries, and in particular relates to a preparation method of a nickel-cobalt sulfide / graphene composite material zinc-air battery bifunctional catalyst. Background technique [0002] In order to meet the challenges of energy crisis, global warming and environmental pollution, it is urgent to develop new, green and high-performance energy storage and conversion systems to replace traditional fossil fuel energy systems. In these energy storage and conversion systems, batteries are one of the most effective ways to solve the above problems. Compared with other battery systems, zinc-air batteries have high energy density (1086 Wh / kg), good safety, and low cost. However, due to limitations in chargeability, power density, and energy efficiency, their performance and large-scale applications are limited. The oxygen reduction and oxygen evolution reaction (ORR / OER) reaction ki...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/08B82Y40/00
CPCH01M4/8825H01M4/90H01M4/9083H01M12/08B82Y40/00Y02E60/10
Inventor 弓巧娟梁云霞孙晓玲李威威
Owner YUNCHENG UNIVERISTY
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