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Nitrogen-doped cuprous oxide electrocatalyst, preparation method, electrode and application

A technology of cuprous oxide and electrocatalyst, which is applied in the field of electrocatalysis, can solve the problems of Cu instability and hinder the application of Cu2O, and achieve the effect of improving reaction activity and high reaction selectivity

Active Publication Date: 2021-08-13
BEIJING AEROSPACE PROPULSION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in CO 2 Cu(I) is very unstable in the reduction reaction, and Cu(I) will undergo an irreversible disproportionation reaction in solution (Cu(I) 2 O→Cu+CuO), this problem hinders the Cu 2 Application of O in electrocatalysis

Method used

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  • Nitrogen-doped cuprous oxide electrocatalyst, preparation method, electrode and application
  • Nitrogen-doped cuprous oxide electrocatalyst, preparation method, electrode and application
  • Nitrogen-doped cuprous oxide electrocatalyst, preparation method, electrode and application

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preparation example Construction

[0025] According to a first aspect of the present invention, a method of preparing a nitrogen-doped oxide copper electrocatalyst includes the following steps:

[0026] Water-soluble copper salt and urea are placed in two different porcelain boats, and then placed in a high temperature furnace to 300 to 400 ° C, preferably the temperature rise rate is set to 4 ~ 6 ° C · min -1 And keep this temperature for at least 2 hours, the entire reaction process into flowing argon, the rate is 1 ~ 3L · h -1 After the reaction is completed, it is cooled to room temperature, and the product of the reaction is cleaned with an aqueous solution of alcohol or the like, and finally drying 50 to 70 ° C in a vacuum drying tank, and finally obtaining nitrogen-doped oxide (N-Cu). 2 O).

[0027] In a preferred embodiment, the quality ratio of the water-soluble copper salt and urea is (2 to 4): 5.

[0028] In the second aspect, the nitrogen doped oxide copper electrocatalyst prepared by the preparation me...

Embodiment 1

[0034] Put 300 mg of copper and 0.5 g of urea in two different porcelain boats, and then placed in a tube furnace to 300 ° C, and the temperature rise rate is set to 5 ° C · min -1 And keep this temperature for 2 hours, the process of the entire reaction through the flow of argon, the rate is 2 l · h -1 . After the reaction was completed, the reaction was cooled to room temperature, and the product of the reaction was washed with an aqueous solution of alcohol, and finally drying at 60 ° C in a vacuum drying tank, and finally obtained nitrogen doped oxide (N-Cu) 2 O).

experiment example 1

[0036] Experimental Example 1 Micro Structure Analysis

[0037] Embodiment 1 Preparation of nitrogen doped oxide of copper, such as figure 1 Indicated. The overall morphology is a cube structure that is uniform in size ( figure 1 A and 1B). We enlarge the local area and found that the lattice spacing of the crystal is about 0.38 nm to 0.40 nm ( figure 1 c), this is more normal Cu 2 O The lattice spacing is small, and the selected area electronic diffraction (SAED) graphic also shows a high crystallinity ( figure 1 d).

[0038] As contrasting us from electron microscopy figure 2 It can be seen in that there is no nitrogen-doped oxide, agglomerate stack is more serious, and it is basically in the form of agglomeration. It can therefore be determined that the introduction of the nitrogen element changes some lattice structure of the material to rearrange the combination.

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Abstract

The invention provides a nitrogen-doped cuprous oxide electrocatalyst, a preparation method, an electrode and application. The preparation method comprises the following steps: placing water-soluble copper salt and urea in two different porcelain boats, then placing the porcelain boats in a high-temperature furnace, conducting heating to 300-400 DEG C at a heating rate of 4-6 DEG C / min, keeping the temperature for at least 2 hours, introducing flowing argon in the whole reaction process at a rate of 1-3 L / h, performing cooling to reach a room temperature after the reaction is completed, cleaning a reaction product, and finally, drying the reaction product in a vacuum drying oven at a temperature of 50-70 DEG C so as to finally obtain the nitrogen-doped cuprous oxide. The nitrogen-doped cuprous oxide electrocatalyst provided by the invention shows excellent catalytic performance in the process of selectively and electrochemically reducing CO2 into a C2 product.

Description

Technical field [0001] The present invention belongs to the field of electrocatalytic technology, and in particular, the present invention relates to a nitrogen-doped oxide copper electrocatalyst, preparation method, electrode, and application. Background technique [0002] Electrochemical catalytic reduction carbon dioxide (CO 2 ) Prepare some valuable chemicals, providing a potential way to achieve carbon cycle society and renewable power storage, so developing a highly active, high-selective and high-stability electrocatalysts are developing this technology. A key approach. [0003] In numerous metal catalysts, the copper-based catalyst has broad application prospects due to the combination of mild CO, in the production of olefins and oxygenated compounds. Among them, the impact of the oxidized state of copper due to its own grain boundaries, high-local pH and residual oxygen and other factors prefer to generate C2 products more in catalytic reactions. Among them, copper oxide...

Claims

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Application Information

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IPC IPC(8): C25B11/052C25B11/091C25B3/03C25B3/26
CPCY02P20/133
Inventor 倪伟章丹亭张娜马骁申帅帅赵梦芸梁怡琪
Owner BEIJING AEROSPACE PROPULSION INST
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