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Preparation and application of a znsn electrode for electrochemical reduction of carbon dioxide

A carbon dioxide and electrochemical technology, applied in the direction of electrodes, electrolytic components, electrolytic process, etc., can solve the problems of lower catalyst utilization rate and small specific surface area of ​​Zn nanoparticles, so as to reduce the mass transfer polarization resistance and increase the reactive area , the effect of simple deposition method

Active Publication Date: 2021-08-06
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above electrode structure can improve the conversion rate of carbon dioxide to a certain extent, due to the small specific surface area of ​​Zn nanoparticles and the need for additional binders in the electrode preparation process, the utilization rate of the catalyst is reduced.

Method used

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  • Preparation and application of a znsn electrode for electrochemical reduction of carbon dioxide
  • Preparation and application of a znsn electrode for electrochemical reduction of carbon dioxide
  • Preparation and application of a znsn electrode for electrochemical reduction of carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Treat carbon felt and carbon paper in the air at 500°C, then degrease and clean them in ethanol and acetone as the base layer; ZnCl with a concentration of 0.05mol / L 2 Aqueous solution and SnCl with a concentration of 0.2mol / L 2 Aqueous solution and HCl with a concentration of 0.05mol / L are mixed; the molar ratio of Zn to Sn is 5:12; and 0.05mol / L polyvinylpyrrolidone with a molar ratio of Zn to polyvinylpyrrolidone of 1:2 is added to the above mixture , using a current density of -60mA / cm 2 The constant current is deposited for 2000s, and the ZnSn catalyst is deposited on the surface of the base layer; the electrode with the ZnSn electrodeposited layer is placed in a reactor with a polytetrafluoroethylene sleeve, and 300ppm of ascorbic acid aqueous solution is added. 20% to 60% of the volume of the reaction solution, react at 180 ° C for 12 hours and then cool down to room temperature naturally; after washing and drying, place the heat-treated electrode in CO 2 0.5mo...

Embodiment 2

[0050] Treat carbon felt and carbon paper in the air at 500°C, then degrease and clean them in ethanol and acetone as the substrate; ZnCl with a concentration of 0.08mol / L 2 Aqueous solution and SnCl with a concentration of 0.2mol / L 2 Aqueous solution and HCl with a concentration of 0.08mol / L are mixed; the molar ratio of Zn and Sn is 1:3; Trimethyl ammonium chloride was added to the above mixed solution, and the constant current density was -40mA / cm2, deposited for 2400s, and the ZnSn catalyst was deposited on the surface of the base layer, and the electrode with the ZnSn electrodeposited layer was placed in a polyfour Add 500ppm of ascorbic acid aqueous solution to the reaction kettle with vinyl fluoride cover, the reaction solution volume accounts for 50% of the reaction kettle volume, react at 180°C for 12 hours and then cool down to room temperature naturally; after washing and drying, place the heat-treated electrode in in CO 2 The electrode was prepared by performing ...

Embodiment 3

[0052] Treat carbon felt and carbon paper in the air at 500°C, then degrease and clean them in ethanol and acetone as the substrate; ZnCl with a concentration of 0.05mol / L 2 Aqueous solution and SnCl with a concentration of 0.2mol / L 2 Aqueous solution and HCl with a concentration of 0.05mol / L are mixed; the molar ratio of Zn to Sn is 4:7; Alkyltrimethylammonium bromide is added to the above mixed solution, and a constant current density of -100mA / cm2 is used to deposit for 2000s to deposit a ZnSn catalyst on the surface of the base layer. Place the electrode with the ZnSn electrodeposited layer in a reaction kettle with a polytetrafluoroethylene sleeve, add 200ppm of amino acid aqueous solution, the volume of the reaction solution accounts for 50% of the reaction kettle volume, react at 180 ° C for 12 hours and then naturally Cool down to room temperature; after washing and drying, place the heat-treated electrode in CO 2 Saturated 0.5mol / L KHCO 3 The reduction was performe...

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Abstract

The invention relates to the preparation and application of a carbon dioxide electrochemical reduction ZnSn electrode, which consists of three layers: a base layer, a nanostructured ZnSn electrodeposition layer and a reduction layer formed on the surface; the electrode preparation method: carbon felt, carbon paper Treat in the air, then degrease and clean in ethanol and acetone as the base layer; ZnCl 2 Aqueous solution and SnCl 2 The aqueous solution and the acid solution are mixed and added with surfactant, and the electrolyte is prepared after magnetic stirring; then electrodeposited on the base layer with constant current density or constant potential, and dried; the electrode with ZnSn electrodeposited layer is placed inside In a reaction kettle with a polytetrafluoroethylene sleeve, add a reaction solution to react; then perform reduction in a certain electrolyte solution to finally obtain the electrode. The preparation method provided by the present invention is simple and easy to control, and the prepared electrode structure is controllable, and has excellent CO 2 The selectivity of the electrochemical reduction to formic acid and CO, the electrode also has excellent electrocatalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of ZnSn electrodes for electrochemical reduction of carbon dioxide, and in particular relates to the preparation and application of ZnSn electrodes for electrochemical reduction of carbon dioxide. Background technique [0002] With the rapid development of my country's economy and society, human demand for energy continues to increase, CO 2 Gas emissions are also increasing. Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 It is a technology to realize the resource utilization of CO2 by reducing it to chemicals, and it is combined with other CO2 2 Compared with conversion technology, the biggest advantage of ERC technology is that water can be used as the hydrogen source for the reaction, and CO2 can be realized at normal temperature and pressure. 2 High-efficiency conversion, so there is no need for additional energy consumption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/053C25B11/065C25B11/089C25B1/23C25B3/07C25B3/26C25D3/56C25D5/18C25D5/48C25D5/54
CPCC25B1/00C25D3/56C25D5/18C25D5/48C25D5/54
Inventor 钟和香潘立卫张晶
Owner DALIAN UNIV
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