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Preparation and application of copper electrode for electrochemical reduction of carbon dioxide

A carbon dioxide, electrochemical technology, applied in electrodes, liquid chemical plating, electrolysis process, etc., can solve the problem of different catalytic reduction performance, and achieve the effect of improving selectivity and activity, increasing deposition speed, and increasing current density

Active Publication Date: 2020-09-08
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different metal catalysts are used for the ERC reaction, the catalytic reduction performance is different, the product distribution and Faradaic efficiency are also very different.

Method used

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  • Preparation and application of copper electrode for electrochemical reduction of carbon dioxide
  • Preparation and application of copper electrode for electrochemical reduction of carbon dioxide
  • Preparation and application of copper electrode for electrochemical reduction of carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 1. Use copper mesh as the base, ultrasonically wash in water and ethanol for 10 minutes, and then wash in 0.5M H 2 SO 4 in, and at 20mA / cm 2 Perform leveling for 360s, ultrasonic cleaning, and dry under the protection of an inert atmosphere as the substrate;

[0049] 2. Place the treated base layer in a tube furnace for heat treatment for a certain period of time. The high-temperature heat treatment is carried out in air at 600°C for 24 hours to obtain Cu x O nanowires / substrate;

[0050] 3. Select Cu(NO 3 ) 2 ·3H 2 O is used as a precursor copper salt solution, wherein the concentration of copper ions is 7mM; a certain amount of urea is added as an alkaline precipitating agent, so that the molar concentration ratio of the alkaline precipitating agent and copper ions is 20:1, and vitamin C is added as a reducing agent. Make the molar ratio of the reducing agent to the precursor copper salt 2:1, select 200ppm of sodium saccharinate as an additive, add an alkaline p...

Embodiment 2

[0055] 1. Use copper mesh as the base, ultrasonically wash in water and ethanol for 10 minutes, and then wash in 0.5M H 2 SO 4 in, and at 20mA / cm 2 Perform leveling for 360s, ultrasonic cleaning, and dry under the protection of an inert atmosphere as the substrate;

[0056] 2. Place the treated base layer in a tube furnace for high-temperature heat treatment for a certain period of time. The high-temperature heat treatment is performed in air at 600° C. for 24 hours to obtain Cu x O nanowires / substrate;

[0057] 3. Select Cu(NO 3 ) 2 ·3H 2 O is used as a precursor copper salt solution, wherein the concentration of copper ions is 7mM; a certain amount of ammonia is added as an alkaline precipitant, so that the molar concentration ratio of the alkaline precipitant to copper ions is 20:1, and glucovitamin C is added as a reducing agent , so that the molar ratio of the reducing agent to the precursor copper salt is 2:1, select 200ppm of sodium saccharinate as an additive, ad...

Embodiment 3

[0062] 1. Use copper mesh as the base, ultrasonically wash in water and ethanol for 10 minutes, and then wash in 0.5M H 2 SO 4 in, and at 20mA / cm 2 Perform leveling for 360s, ultrasonic cleaning, and dry under the protection of an inert atmosphere as the substrate;

[0063] 2. Place the treated base layer in a tube furnace for high-temperature heat treatment for a certain period of time. The high-temperature heat treatment is performed in air at 600° C. for 24 hours to obtain Cu x O nanowires / substrate;

[0064] 3. Select Cu(NO 3 ) 2 ·3H 2 O is used as a precursor copper salt solution, wherein the concentration of copper ions is 7mM; a certain amount of urea is added as an alkaline precipitating agent, so that the molar concentration ratio of the alkaline precipitating agent and copper ions is 20:1, and vitamin C is added as a reducing agent. Make the molar ratio of the reducing agent to the precursor copper salt 2:1, select 400ppm of sodium tartrate as an additive, add ...

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Abstract

The invention relates to preparation and application of a copper electrode for electrochemical reduction of carbon dioxide. The preparation method of the electrode comprises the following steps: treating a substrate, oxidizing the substrate at a high temperature, mixing a precursor copper salt solution with an alkaline precipitator, a reducing agent and an additive according to a certain ratio, depositing copper by a hydrothermal method, performing electrochemical potentiostatic reduction, and washing with concentrated hydrochloric acid to prepare the copper electrode. According to the invention, the Cu oxide with the nanowire structure grows on the substrate through a chemical oxidation reaction; then, thin-layer nano-particles grow on the surface through hydrothermal reaction; a surfactant and a reducing agent are introduced in the hydrothermal reaction process; the surface active agent is used for directionally adsorbing the surface of the substrate metal; the growth orientation ofthe metal oxide can be regulated and controlled, a reducing agent is introduced through hydrothermal reaction deposition, the nanowire part of the substrate layer is reduced to form hole copper, nanocopper particles with high specific surface area are deposited on the surface of the hole copper, the active specific surface area of the copper electrode is increased, and the proportion of edge andcorner active sites is increased.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of a copper electrode for electrochemical reduction of carbon dioxide, and in particular relates to the preparation and application of a copper electrode for electrochemical reduction of carbon dioxide. Background technique [0002] With the rapid development of my country's social economy, people's demand for energy is increasing day by day, and the consumption of fossil energy such as coal, oil, and natural gas will cause CO in the air to 2 The excessive emission of gas and the resulting "greenhouse effect" have become increasingly prominent, which have seriously affected human survival and sustainable development of society. CO 2 As a rich carbon source, how to reduce its emissions and effectively convert it into high value-added chemicals has become a research hotspot for many researchers in the world in recent years. So far, for CO 2 There are many methods of fixation a...

Claims

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Application Information

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IPC IPC(8): C25B11/06C23C18/38C25B1/00C25B3/04C25B3/25
CPCC25B1/00C23C18/38
Inventor 钟和香刁国华潘立卫张晶
Owner DALIAN UNIV
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