Oxygen defect-rich ultrathin nickel cobalt oxide nanosheet electrode array and preparation method thereof

A nickel-cobalt oxide and nanosheet array technology, which is applied in nanotechnology, electrodes, and nanotechnology for materials and surface science, can solve problems such as high overpotentials, increase the number, and improve oxygen evolution and oxygen reduction reactions Catalytic activity, the effect of increasing the electrochemical specific surface area

Active Publication Date: 2018-08-24
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the nanostructured arrays reported so far to simultaneously catalyze oxygen reduction and oxygen evolution reactions, or to catalyze both reactions with high overpotentials.

Method used

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  • Oxygen defect-rich ultrathin nickel cobalt oxide nanosheet electrode array and preparation method thereof
  • Oxygen defect-rich ultrathin nickel cobalt oxide nanosheet electrode array and preparation method thereof
  • Oxygen defect-rich ultrathin nickel cobalt oxide nanosheet electrode array and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 11

[0028] The preparation of embodiment 1 No. 1 catalyst

[0029] 1) Dissolve 1mmol of cobalt nitrate, 5mmol of ammonium fluoride and 15mmol of urea in 80mL of ultrapure water, and dissolve with electromagnetic stirring to obtain a clear solution.

[0030] 2) The solution obtained in the above step 1) was transferred to a hydrothermal kettle, reacted in a constant temperature oven at 150°C for 5 hours, cooled naturally to room temperature, and the product was washed and dried to obtain the No. 1 catalyst prepolymer.

[0031] 3) Put the No. 1 catalyst prepolymer into a muffle furnace, heat-treat at 300° C. for 1-4 hours, and obtain No. 1 catalyst.

Embodiment 2

[0032] Preparation of No. 2 catalyst of embodiment 2

[0033] 1) Immerse the nickel foam in absolute ethanol, ultrasonically clean it for 0.5-1 hour, and let it dry naturally.

[0034] 2) Dissolve 1mmol of cobalt nitrate, 5mmol of ammonium fluoride and 15mmol of urea in 80mL of ultrapure water, and dissolve with electromagnetic stirring to obtain a clear solution.

[0035] 3) Transfer the solution obtained in the above step 2) to a hydrothermal kettle, immerse the nickel foam cleaned in step 1) in the solution, react in a constant temperature oven at 150°C for 5 hours, cool naturally to room temperature, and take out the nickel foam, After washing and drying, No. 2 catalyst prepolymer was obtained.

[0036] 4) Put the No. 2 catalyst prepolymer into a muffle furnace, heat-treat at 300° C. for 1-4 hours, and obtain No. 2 catalyst.

Embodiment 3

[0037] Preparation of No. 3 catalyst of embodiment 3

[0038] 1) Immerse the nickel foam in absolute ethanol, ultrasonically clean it for 0.5-1 hour, and let it dry naturally.

[0039] 2) Dissolve 1 mmol of cobalt nitrate, 5 mmol of ammonium fluoride, 15 mmol of urea and 0.5 mmol of silver nitrate in 80 mL of ultrapure water, and dissolve with electromagnetic stirring to obtain a clear solution.

[0040] 3) Transfer the solution obtained in the above step 2) to a hydrothermal kettle, immerse the nickel foam cleaned in step 1) in the solution, react in a constant temperature oven at 150°C for 5 hours, cool naturally to room temperature, and take out the nickel foam, After washing and drying, catalyst prepolymer No. 3 was obtained.

[0041] 4) Put the No. 3 catalyst prepolymer into a muffle furnace, heat-treat at 300° C. for 1-4 hours, and obtain No. 3 catalyst.

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Abstract

The invention discloses an oxygen defect-rich ultrathin nickel cobalt oxide nanosheet electrode array catalyst. The catalyst is doped with silver, the catalyst structure is a nanosheet array structure, the thickness of the catalyst is 1-3 nanometers, and oxygen defect exists in a surface of the catalyst. The invention also discloses a preparation method and application of the catalyst. The catalyst is directly grown on a surface of formed nickel of a current collector in an in-situ way, the silver is doped into the catalyst, thus, the electrochemical specific area, the electrical conductivityand the electrocatalytic performance of the catalyst are improved; and meanwhile, after a catalyst precursor is thermally processed, thermal processing is further performed under an ammonia atmosphere, so that the oxygen defect is enriched in the surface of the catalyst, the numbers of exposed active sites are increased, the oxygen evolution and the oxidization-reduction reaction catalytic activity of the catalyst are remarkably improved, the catalyst is used in a rechargeable zinc-air battery, and high battery efficiency and cycle stability are shown.

Description

technical field [0001] The present invention relates to the fields of metal-air batteries and electrolyzed water, in particular to electrocatalysts for rechargeable and dischargeable zinc-air batteries, and more specifically to an ultra-thin nickel-cobalt oxide nanosheet electrode whose surface is rich in oxygen vacancies Array catalysts and their preparation and application. Background technique [0002] With the development of science and technology, since the 1990s, green electric energy has shown a rapid growth trend. Green power includes: hydropower, wind power, solar power, tidal power, nuclear power, etc. However, green electric energy has strong fluctuations and geographical restrictions. Therefore, energy storage and conversion technology has become the focus of research. [0003] Rechargeable zinc-air batteries have the advantages of high volumetric energy density, high specific capacity, safety, and low cost. They can be used in electric vehicles and other green...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90H01M12/06C25B1/04C25B11/06B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25B1/04C25B11/04H01M4/8663H01M4/8673H01M4/885H01M4/9016H01M12/06Y02E60/10Y02E60/36
Inventor 孙予罕向苇凯李小鹏杜福平钱婧
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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