Carbon cloth-supported nickel-cobalt-oxygen nanosheet composite material and its preparation method and electrode application

A technology of composite materials and nanosheets, applied in the field of metal-air battery electrocatalysis, can solve the problems of low activity, single active site, poor conductivity, etc., and achieve the effect of improving electrode performance, reducing quality, and simple experimental steps

Active Publication Date: 2022-08-05
TIANJIN UNIV
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Problems solved by technology

However, a single metal oxide electrode material has a single active site, poor conductivity, and low activity. Bimetallic composite materials have become a new research direction.

Method used

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  • Carbon cloth-supported nickel-cobalt-oxygen nanosheet composite material and its preparation method and electrode application
  • Carbon cloth-supported nickel-cobalt-oxygen nanosheet composite material and its preparation method and electrode application
  • Carbon cloth-supported nickel-cobalt-oxygen nanosheet composite material and its preparation method and electrode application

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preparation example Construction

[0035] The preparation method of the nickel-cobalt-oxygen porous nanosheet composite material of the present invention comprises the following steps:

[0036] 1), dissolve cobalt nitrate and nickel nitrate in the deionized water of deoxygenation, stir and dissolve in gas protective atmosphere, obtain mixed salt solution;

[0037] 2), stir the sodium hydroxide solution and mixed salt solution at room temperature, then centrifuge out the precipitate, wash with deionized water and absolute ethanol;

[0038] 3), vacuum-drying the precipitate obtained in step 2) to obtain a precursor, and sintering to obtain a nickel-cobalt-oxygen nanosheet composite material catalyst that can be used for the cathode of an air battery.

[0039] The dosage of cobalt nitrate and nickel nitrate is 3~5mmol and 12~20mmol;

[0040] The amount of deionized water is 50mL;

[0041] Described step 1) protective gas gas is N 2 , O 2 Or air; the stirring speed is 200~600r / min, the time is 0.5~1.5h, and the...

Embodiment 1

[0045] Dissolve 12 mmol of cobalt nitrate and 3 mmol of nickel nitrate in 50 mL of deoxygenated deionized water under N 2 Stir in a protective atmosphere for 1.5 h, and the stirring speed is 200 r / min to obtain a mixed salt solution. 25mL of 2M NaOH was added to the mixed salt solution, stirred evenly, and the obtained dark green precipitate was washed three times with deionized water and absolute ethanol, then placed in a vacuum oven, and dried under vacuum at 30°C for 10h to obtain the precursor. The above precursor is put into a well-type muffle furnace for sintering, the heating rate is 3-4 °C / min, the holding temperature is 300 °C, the holding time is 3h, and it is cooled under air cooling to obtain elongated pores with a surface of 5-20 nanometers. , hexagonal sheet-shaped nickel-cobalt-oxygen nanocomposite materials with a diameter of 130-150 nanometers.

[0046] The diffraction patterns of the nickel-cobalt-oxygen porous nanosheet composites prepared in the above exam...

Embodiment 2

[0050] Dissolve 16 mmol of cobalt nitrate and 4 mmol of nickel nitrate in 50 mL of deoxygenated deionized water under N 2 Stir for 1 h in a protective atmosphere at a stirring speed of 400 r / min to obtain a mixed salt solution. 25mL of 2.7M NaOH was added to the mixed salt solution, stirred evenly, and the obtained dark green precipitate was washed three times with deionized water and absolute ethanol, then placed in a vacuum oven, and dried under vacuum at 25°C for 15h to obtain the precursor. The above-mentioned precursors are put into a well-type muffle furnace for sintering, the heating rate is 4-5 °C / min, the holding temperature is 325 °C, the holding time is 3h, and it is cooled under air-cooling conditions to obtain surface 5-20 nanometer long pores with a diameter of 130-140 nanometer hexagonal sheet-shaped nickel-cobalt-oxygen composite cathode catalyst.

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Abstract

The invention relates to a carbon cloth-supported nickel-cobalt-oxygen nanosheet composite material, a preparation method thereof, and application of electrodes; cobalt nitrate and nickel nitrate are dissolved in deoxidized deionized water, stirred and dissolved in a gas protective atmosphere to obtain a mixed salt solution; stir sodium hydroxide solution and mixed salt solution evenly at room temperature, then centrifuge the precipitate, wash with deionized water and anhydrous ethanol; vacuum dry the obtained precipitate to obtain a precursor, and sinter to obtain a product that can be used in air batteries Cathode NiCoO nanosheet composite catalyst. NiCoO nanosheet composites are made of Ni 0.6 Co 2.4 O 4 It is composed of two phases, NiO and NiO, and the diameter of the nanosheet is 100-150 nanometers and the thickness is 10-30 nanometers. The invention realizes the preparation of the nickel-cobalt-oxygen porous nano-sheet composite material catalyst applied to the cathode of the air battery by the method of co-precipitation and sintering, the experimental steps are simple, and the electrode catalytic performance is excellent.

Description

technical field [0001] The invention belongs to the field of metal-air battery electrocatalysis, relates to a preparation method of an oxygen electrode nanocomposite material of high efficiency and low cost, and in particular relates to a carbon cloth supported nickel cobalt oxygen nanosheet composite material and a preparation method thereof and application of the electrode . Background technique [0002] With the depletion of fossil energy and the emergence of a series of environmental problems, renewable, clean and sustainable energy conversion devices have gradually become a research hotspot. Metal-air batteries are considered to be the most ideal energy storage devices due to their extremely high theoretical energy density. Zinc-air batteries are mainly composed of three parts: zinc metal anode, air cathode and separator. Among them, the main problem in the commercialization of rechargeable zinc-air batteries is the preparation of low-cost and high-efficiency air cath...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M12/06B82Y30/00B82Y40/00
Inventor 邓意达赵君胡文彬钟澄张金凤韩晓鹏何宇
Owner TIANJIN UNIV
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