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Ni-Cu LDH electrocatalyst with nanoflower structure, preparation method and application thereof

An electrocatalyst and nanoflower technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problem of difficult application of catalysts, and achieve the effects of high BET, excellent structure, electrochemical durability, and high catalytic efficiency.

Active Publication Date: 2021-12-28
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the catalyzer used in the present invention is difficult to apply in the electrocatalysis of nitrate reduction

Method used

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  • Ni-Cu LDH electrocatalyst with nanoflower structure, preparation method and application thereof
  • Ni-Cu LDH electrocatalyst with nanoflower structure, preparation method and application thereof
  • Ni-Cu LDH electrocatalyst with nanoflower structure, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Dissolve nickel nitrate hexahydrate in a mixed solution of ionized water and triethylene glycol, and mechanically stir to obtain a uniform solution A; the mass ratio of ionized water to triethylene glycol is 1:4; nitric acid hexahydrate The molar ratio of nickel to deionized water is 1:5;

[0029] (2) Add urea and copper chloride dihydrate to the uniform solution A obtained in step (1) to obtain a uniform solution B; in solution B, the molar ratio of urea, copper chloride dihydrate and nickel nitrate hexahydrate is 2:5 :0.5;

[0030] (3) The homogeneous solution B was hydrothermally synthesized at 120°C for 18-30h, after the reaction, centrifuged at 4000r / min for 100min, filtered and washed with deionized water and absolute ethanol several times, and dried in vacuum at 60°C 24h to obtain Ni-CuLDH electrocatalyst.

Embodiment 2

[0032] (1) Dissolve nickel nitrate hexahydrate in a mixed solution of ionized water and triethylene glycol, and mechanically stir to obtain a uniform solution A; the mass ratio of ionized water to triethylene glycol is 1:5; nitric acid hexahydrate The molar ratio of nickel to deionized water is 1:5;

[0033] (2) Add urea and copper chloride dihydrate to the uniform solution A obtained in step (1) to obtain a uniform solution B; in solution B, the molar ratio of urea, copper chloride dihydrate and nickel nitrate hexahydrate is 2:5 :0.5;

[0034] (3) The homogeneous solution B was hydrothermally synthesized at 120°C for 18-30h, after the reaction, centrifuged at 4000r / min for 100min, filtered and washed with deionized water and absolute ethanol several times, and dried in vacuum at 60°C 24h to obtain Ni-CuLDH electrocatalyst.

Embodiment 3

[0036] (1) Dissolve nickel nitrate hexahydrate in a mixed solution of ionized water and triethylene glycol, and mechanically stir to obtain a uniform solution A; the mass ratio of ionized water to triethylene glycol is 1:7; nitric acid hexahydrate The molar ratio of nickel to deionized water is 1:5;

[0037] (2) Add urea and copper chloride dihydrate to the uniform solution A obtained in step (1) to obtain a uniform solution B; in solution B, the molar ratio of urea, copper chloride dihydrate and nickel nitrate hexahydrate is 2:5 :0.5;

[0038] (3) The homogeneous solution B was hydrothermally synthesized at 120°C for 18-30h, after the reaction, centrifuged at 4000r / min for 100min, filtered and washed with deionized water and absolute ethanol several times, and dried in vacuum at 60°C 24h to obtain Ni-CuLDH electrocatalyst.

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Abstract

The invention relates to the technical field of catalysts, and discloses a Ni-Cu LDH electrocatalyst for nitrate radical reduction and a preparation method thereof. The Ni-Cu LDH electrocatalyst is prepared from the following raw materials: zinc nitrate hexahydrate, urea, triethylene glycol and copper chloride dihydrate. According to the invention, the Ni-Cu LDH electrocatalyst is of a nanoflower structure and is used for nitrate radical reduction; the Ni-Cu LDH electrocatalyst prepared by the method has a sheet structure, is high in BET and high in catalytic efficiency, and shows excellent structure and electrochemical durability; and the synthesis method has the advantages of simple process, low energy consumption, mild conditions and good product morphology, and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a nanoflower structure Ni-Cu LDH electrocatalyst and a preparation method and application thereof. Background technique [0002] Although electrochemical nitrogen (N 2 ) reduction reaction (NRR) to produce ammonia, but the reaction rate and faradic efficiency are usually low due to the large bond energy of the nitrogen-nitrogen triple bond (941 kJ / mol). In sharp contrast, the reduction of nitrate (nitrate) to ammonia requires only 204 kJ / mol, so the nitrate reduction reaction (NO 3 RR) has attracted great attention as a more energy-efficient ammonia production strategy. However, the ammonia production rate of NO3RR is still much lower than the Haber route because of the lack of a powerful electrocatalyst to generate high current densities (4200 mA cm -2 ), and well inhibit the competing hydrogen evolution reaction (HER). Low-temperature electrified ammonia production powere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/27
CPCC25B11/091C25B1/27Y02E60/36
Inventor 叶伟徐梦秋
Owner HANGZHOU NORMAL UNIVERSITY
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