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Three-dimensional nickel cobaltate@cobalt selenide (II) nanoneedle array composite material as well as preparation method and application thereof

A composite material and nanoneedle technology, which is applied in the field of three-dimensional nickel cobaltate@cobalt selenide nanoneedle array composite material and its preparation, can solve the problem of reducing the available surface area

Active Publication Date: 2019-08-23
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the van der Waals attraction between them, the nanosheets tend to aggregate together during synthesis, resulting in a reduction in the usable surface area.

Method used

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  • Three-dimensional nickel cobaltate@cobalt selenide (II) nanoneedle array composite material as well as preparation method and application thereof
  • Three-dimensional nickel cobaltate@cobalt selenide (II) nanoneedle array composite material as well as preparation method and application thereof
  • Three-dimensional nickel cobaltate@cobalt selenide (II) nanoneedle array composite material as well as preparation method and application thereof

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preparation example Construction

[0020] The present invention also provides the above-mentioned three-dimensional ZnCo 2 o 4 The preparation method of @CoSe nanoneedle array composite material, including: ZnCo 2 o 4 Hydrothermal reaction of nanoneedle arrays, sodium selenide and cobalt derived from water to produce three-dimensional ZnCo 2 o 4 @CoSe nanoneedle array composites.

[0021] In the above preparation method, the amount of each material can be selected in a wide range, but in order to further improve the prepared three-dimensional ZnCo 2 o 4 Electrocatalytic activity and cycle stability of @CoSe nanoneedle array composites, preferably, ZnCo 2 o 4 The dosage ratio of the nanoneedle array, sodium selenium hydride and cobalt acetate hexahydrate is 0.02g-0.07g:0.5-2.5mmol:0.5-2.5mmol.

[0022] In the above preparation method, the amount of water can be selected in a wide range, but in order to improve the reaction rate and yield, preferably, ZnCo 2 o 4 The dosage ratio of the nanoneedle array ...

Embodiment 1

[0033] 1) Dissolve 1mmol of cobalt nitrate hexahydrate, 0.5mmol of zinc nitrate hexahydrate, 1mmol of ammonium fluoride, and 2.5mmol of urea in 35ml of deionized water. After magnetic stirring for 30min, transfer the mixed solution into a 50ml reaction kettle, and then add Cleaned nickel foam (the size of one side is 2cm×3cm). Put the reaction kettle into a thermostat at 120°C, and react for 5 hours. After the reaction, wash and dry to obtain ZnCo 2 o 4 Nanoneedle array precursor; the ZnCo 2 o 4 The nanoneedle array precursor (containing nickel foam) was calcined at 400 °C for 2 h in an air atmosphere to obtain ZnCo 2 o 4 nanoneedle arrays;

[0034] 2) Add 1mmol of nickel acetate tetrahydrate, 1mmol of sodium selenium hydride and 30ml of water into a 50ml reaction kettle, and then add the ZnCo synthesized above to the kettle. 2 o 4 Nanoneedle array (containing nickel foam), sealed, put the reaction kettle into a constant temperature drying oven at 180°C for 0.5h, wash ...

Embodiment 2

[0036] 1) Dissolve 5mmol cobalt nitrate hexahydrate, 2.5mmol zinc nitrate hexahydrate, 5mmol ammonium fluoride, and 12.5mmol urea in 35ml deionized water. After magnetic stirring for 30min, transfer the mixed solution into a 50ml reaction kettle, and then add Cleaned nickel foam (the size of one side is 2×3cm). Put the reaction kettle into a thermostat at 120°C, and react for 5 hours. After the reaction, wash and dry to obtain ZnCo 2 o 4 Nanoneedle array precursor; the ZnCo 2 o 4 The nanoneedle array precursor (containing nickel foam) was calcined at 400 °C for 2 h in an air atmosphere to obtain ZnCo 2 o 4 nanoneedle arrays;

[0037] 2) Add 1mmol of nickel acetate tetrahydrate, 1mmol of sodium selenium hydride and 30ml of water into a 50ml reaction kettle, and then add the ZnCo synthesized above to the kettle. 2 o 4 Nanoneedle array (containing nickel foam), sealed, put the reaction kettle into a constant temperature drying oven at 180°C for 0.5h, wash after the reacti...

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Abstract

The invention discloses a three-dimensional nickel cobaltate@cobalt selenide (II) nanoneedle array composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: performing a hydrothermal reaction on a ZnCo2O4 nanoneedle array, sodium hydrogen selenide and a cobalt source in water to prepare the three-dimensional ZnCo2O4@CoSe nanoneedle array composite material. The three-dimensional nickel cobaltate@cobalt (II) nanoneedle array composite material provided by the invention has excellent electrocatalytic activity and cycle stability, and can be applied to electrocatalytic hydrolysis of an electrode material; and the preparation method has simple operation, low costs, mild conditions, greenness and environmental protection.

Description

technical field [0001] The invention relates to a nanoneedle array composite material, in particular to a three-dimensional nickel cobaltate@cobalt(II) selenide nanoneedle array composite material and its preparation method and application. Background technique [0002] In order to solve a series of problems such as global energy shortage, environmental crisis and climate deterioration due to the abuse of fossil fuels, more research focuses on finding renewable and green energy sources. Hydrogen with excellent energy density, outstanding energy conversion efficiency, and zero pollutant emissions has been found to be a promising substitute for traditional fossil fuels. Alkaline electrolyte is pointed out to be one of the most effective methods for producing high-purity hydrogen in large-scale industrial production. However, due to the slow kinetics of the anodic oxygen evolution reaction (OER), this reaction process is generally affected by low efficiency and high potential....

Claims

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Application Information

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IPC IPC(8): B01J27/057C25B1/04C25B11/06
CPCB01J27/0573C25B1/04C25B11/091B01J35/396B01J35/33Y02E60/36
Inventor 王秀华容芳郭泽宇
Owner ANHUI NORMAL UNIV
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