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Electrode for CO2 electrochemical reduction and preparation and application thereof

An electrochemical and electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of small electrode reaction area, complex reaction process, and many intermediate products, etc., and achieve high surface roughness and large electrochemical reaction area. Effect

Active Publication Date: 2020-03-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A prominent defect of this type of metal electrode is that the electrode reaction area is small and only concentrated on the surface in contact with the supporting electrolyte, resulting in a high overpotential of the ERC reaction and CO 2 The conversion rate is low; in addition, because the ERC reaction involves multiple electron transfer processes, the reaction process is complicated, and there are many intermediate products, especially when copper is used as the electrode, there are as many as 16 kinds of ERC reduction products, so the selectivity of the product is low One of the problems to be solved for electrode-like

Method used

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  • Electrode for CO2 electrochemical reduction and preparation and application thereof
  • Electrode for CO2 electrochemical reduction and preparation and application thereof
  • Electrode for CO2 electrochemical reduction and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1. Electrode material pretreatment: copper content ≥ 99.5%, thickness 100 microns, area 10 cm 2 The copper sheet is used as the electrode material, firstly after 1200 # After the water abrasive paper is polished smooth, soak it in concentrated hydrochloric acid with a volume fraction of 36% to 38% at room temperature for 20 minutes to remove surface impurities, then rinse it with a large amount of deionized water until it is neutral, and blow it with high-purity nitrogen. Dry;

[0032] 2. Electroplating solution preparation: to analyze pure grade CuSO 4 ·5H2 O is used as the main salt, and ethylenediaminetetraacetic acid (EDTA) and polyvinylpyrrolidone (PVP k12, average molecular weight 3000) are used as the first and second additives respectively, and 250ml of electroplating solution is prepared with ultrapure water with a resistivity of 18.2MΩ. Control the concentrations of the main salt, EDTA and PVP in the plating solution to be 0.1M, 1.5mM and 100ppm respectively...

Embodiment 2

[0043] 1. Substrate material pretreatment: with a thickness of 200 microns, a porosity of 78%, and an area of ​​10 cm 2 The THP-H-060 carbon paper used as the electrode material was soaked in acetone solution for 20 minutes to remove the grease on the surface of the fiber, and then dried naturally after taking it out;

[0044] 2. Electroplating solution preparation: to analyze pure grade CuNO 3 ·3H 2 O is used as the main salt, ethylenediaminetetramethylene sodium phosphate (EDTMPS) and polyethylene glycol (PEG 4000) are used as the first and second additives respectively, and 250ml of electroplating solution is prepared with ultrapure water with a resistivity of 18.2MΩ. Control the concentrations of main salt, EDTMPS and PVP in the plating solution to be 0.05M, 0.5mM and 20ppm respectively, and use 6MHNO 3 Adjust the pH of the plating solution to 3.0, and at the same time prepare 100ml of the plating solution without adding the two additives, CuNO 3 The concentration is 0....

Embodiment 3

[0050] 1. Electrode material pretreatment: copper content ≥ 99.5%, thickness 100 microns, area 10 cm 2 The copper sheet is used as the electrode material, firstly after 1200 # After the water abrasive paper is polished smooth, soak it in concentrated hydrochloric acid with a volume fraction of 36% to 38% at room temperature for 20 minutes to remove surface impurities, then rinse it with a large amount of deionized water until it is neutral, and blow it with high-purity nitrogen. Dry;

[0051] 2. Electroplating solution preparation: to analyze pure grade CuCl·2H 2 O was used as the main salt, sodium alginate and polyethylene glycol (PEG 6000) with a relative molecular mass of 6000 were used as the first and second additives, and 250ml of electroplating solution was prepared with ultrapure water with a resistivity of 18.2MΩ. The concentrations of the main salt, sodium alginate and PEG6000 in the solution were 0.5M, 5mM and 500ppm respectively, the pH of the plating solution wa...

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Abstract

The invention relates to an electrode for CO2 electrochemical reduction and preparation and application of the electrode for CO2 electrochemical reduction. The preparation process of the electrode includes the steps of soaking a substrate material into an electroplating liquid containing main salt and additives after performing impurity removal on the substrate material, and performing electrochemical deposition under inert atmosphere protection and stirring conditions to obtain the electrode with micrometer Cu particles growing on the surface. The proportion of side atoms of the Cu particlesdeposited on the substrate surface of the prepared electrode is much higher than that of corner atoms, which is beneficial to improving the coverage of CO* on the surface of the electrode and providesa favorable environment for a subsequent CO* dimerization reaction and a hydrogenation reaction; and the electrode has a significant effect of inhibiting the side reaction of hydrogen evolution and meanwhile has high C2H4 selectivity.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to an electrode with prism-shaped surface particles and its preparation technology. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 Reduction to the target product to achieve CO 2 A technology for transformation and efficient use. with other COs 2 Compared with conversion technology, the outstanding advantages of ERC technology are simple operation, low cost, water can be used as protonated hydrogen source, and CO2 can be realized under normal temperature and pressure. 2 High-efficiency conversion, so there is no need for energy consumption caused by hydrogen production, heating, and pressurization required by chemical conversion technology, and the investment in equipment is small. [0003] At present, the main factors for the slow development of ERC technology include: ...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25B3/04C25B11/06C25B3/25
CPCC25D3/38C25B3/25C25B11/051C25B11/075
Inventor 邱艳玲李先锋张华民张桃桃姚鹏飞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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