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Copper-based compound/copper nanoelectrode with interfacial synergistic effect and its preparation and application

A synergistic effect, compound technology, applied in electrodes, nanotechnology, electrolysis components, etc., can solve the problems of poor stability, difficult to suppress side reactions, low product selectivity, etc., to achieve good selectivity, good hydrogen evolution reaction, and inhibit hydrogen evolution reaction. Effect

Active Publication Date: 2022-01-18
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, current copper-based catalysts still have problems such as low product selectivity, difficulty in suppressing side reactions (hydrogen evolution reaction), and poor stability. Therefore, it is still a great challenge to design a copper-based catalyst with high current density, high selectivity and activity.

Method used

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  • Copper-based compound/copper nanoelectrode with interfacial synergistic effect and its preparation and application
  • Copper-based compound/copper nanoelectrode with interfacial synergistic effect and its preparation and application
  • Copper-based compound/copper nanoelectrode with interfacial synergistic effect and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A cuprous oxide / copper nanoelectrode material with interfacial synergistic effect is prepared by the following steps:

[0081] A, prepare reaction solution, prepare the sodium citrate dihydrate of 1.7mol / L, the copper sulfate pentahydrate solution of 2.0mol / L, the sodium hydroxide solution of 5.5mol / L, the ascorbic acid solution of 20mol / L;

[0082] B. Under the stirring process, take 2ml of 1.7mol / L sodium citrate solution in a 500ml beaker (400ml of pure water is housed in the beaker), stir for 20min; add 2ml of 2.0mol / L sulfuric acid pentahydrate to the above solution Copper solution, stir for 5 minutes; add 2ml of 5.5mol / L sodium hydroxide solution to the above mixed solution, stir for 5 minutes; finally add 2ml of 20mol / L ascorbic acid solution into the mixed solution, stir for 30min, centrifuge, wash and vacuum dry , to obtain orange-yellow cuprous oxide powder;

[0083] C. Weigh 3 mg of the cuprous oxide powder obtained in step B and evenly disperse it into 1 ml...

Embodiment 2

[0105] Prepare cuprous oxide / copper nanometer electrode material according to the method described in embodiment 1, and the difference of embodiment 1 is only: square wave potential treatment time is respectively 15 minutes, 30 minutes, 45 minutes and 60 minutes. Finally, four different interface electrode materials were obtained.

[0106] To characterize the 4 interface electrode materials obtained above, see Figure 7a~7d .

[0107] Figure 7a~7d It is the scanning electron micrograph of the cuprous oxide / copper nanomaterial obtained after the different square wave treatment times of embodiment 2. Wherein a picture is 15 minutes; b picture is 30 minutes; c picture is 45 minutes; d picture is 60 minutes, and the particle diameter of cuprous oxide / copper nanoparticles is about 30~150nm.

[0108] Figure 7a~7d It can be seen that as the processing time of the square wave prolongs, the morphology of the nanomaterials changes continuously. At 15 minutes, it is still a cube si...

Embodiment 3

[0114] Copper nitride / copper nanoelectrode materials with interfacial synergy were prepared by the following methods:

[0115] A. Weigh 100mg of copper acetate and 0.2g of urea and put them in two porcelain boats respectively, keep calcination at 800°C for 3 hours in an argon atmosphere, and place the urea above the air flow at a flow rate of 3L / h. The ammonia gas generated by the decomposition reacts with copper acetate, and the product is centrifugally washed and dried to obtain copper nitride powder with a cubic shape.

[0116] B. Weigh 3 mg of the copper nitride powder obtained in step A and evenly disperse it into 1 ml of absolute ethanol, add 6 μL of Nafion solution with a mass fraction of 5% to the mixed dispersion, ultrasonicate for 10 minutes to disperse evenly, and use 10 μL Use a pipette gun to spread the mixture evenly on 1*0.5cm -2 Gas diffusion conductive substrate (in this example, preferably gas diffusion carbon fiber paper is used as the conductive substrate ...

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Abstract

The invention belongs to the technical field of electrode materials, in particular to a copper-based compound / copper nano-electrode with interface synergistic effect and its preparation method and application. The electrode includes a conductive substrate and a copper-based compound / copper nano-catalyst supported on the surface; the copper-based compound includes but is not limited to cuprous oxide, copper nitride, copper oxide and other compounds. The invention also discloses the preparation method and application of the electrode. The present invention prepares an electrode material with interface regulation function for the first time, and utilizes the synergistic effect of monovalent copper / zero valent copper, divalent copper / zero valent copper and divalent copper / monovalent copper / zero valent copper to reduce carbon monoxide dimerization The reaction energy barrier, so that the hydrogen evolution reaction can be well suppressed during the electrochemical carbon dioxide reduction, and it has good selectivity to the multi-carbon products ethylene, ethanol and isopropanol.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, in particular to a copper-based compound / copper nano-electrode with interfacial synergistic effect and its preparation method and application. Background technique [0002] Energy is the material basis in the process of national economic development and the basic condition for human survival. With the rapid rise of my country's economy, the demand for energy is increasing day by day. The insufficient supply of conventional fossil energy such as coal, oil, and natural gas, and price fluctuations have brought many uncertain factors. Energy security has become a strategic issue that my country must deal with. At the same time, the massive consumption of fossil energy directly leads to a sharp increase in carbon dioxide emissions, thereby intensifying the "greenhouse effect" and causing global warming. Vigorously developing new energy technologies and improving the conversion and utiliza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/07C25B3/03C25B3/26C25B11/052C25B11/065C25B11/091B82Y40/00
CPCB82Y40/00
Inventor 邝允王胜楠钟洋孙晓明
Owner BEIJING UNIV OF CHEM TECH
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