Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst

A carbon dioxide and catalyst technology, which is applied in the field of carbon dioxide electrochemical reduction catalyst and its preparation, can solve the problems of reducing the yield of formic acid, high overpotential, and accelerating the rate of hydrogen evolution, and achieve the goal of improving energy efficiency, high electrocatalytic activity and selectivity Effect

Inactive Publication Date: 2019-09-27
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It has been reported that carbon dioxide can be electrochemically reduced by a variety of different metals such as copper, silver, tin, etc. to prepare carbon monoxide, methane, methanol, formic acid, etc. For example, metal tin has a strong selectivity for formic acid, and the yield of formic acid can be as high as 95%. However, as the reduction reaction proceeds, metal-organic complexes will be formed on the surface of the tin plate electrode, which will accelerate the rate of hydrogen evolution and reduce the yield of formic acid.
Another example is that the silver catalyst has high selectivity for the reduction of carbon dioxide to carbon monoxide, but the disadvantage is that it requires a high overpotential

Method used

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  • Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst

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Effect test

Embodiment 1

[0019] The preparation method of the carbon dioxide electrochemical reduction catalyst includes the following steps:

[0020] (1) Precursor preparation by spray drying method: Weigh 0.2 g of copper chloride and dissolve it in 150 mL of deionized water to obtain a copper chloride aqueous solution; under stirring conditions, add the copper chloride aqueous solution to 150 mL with a concentration of 2 mg / mL In the graphene oxide aqueous solution, stir evenly to obtain a mixed solution; the mixed solution is spray-dried at a temperature of 180°C and a feed rate of 5 mL / min, and the product is collected to obtain a precursor;

[0021] (2) Calcining to prepare composite materials: Take 0.3 g of the precursor prepared in step (1) and spread it on the bottom of the porcelain boat, place it in a tube furnace for calcination, and pass argon at a rate of 150 mL / min and keep argon throughout the process , The temperature is raised to 250 DEG C at a heating rate of 2 DEG C / min, the temperature ...

Embodiment 2

[0023] The preparation method of the carbon dioxide electrochemical reduction catalyst includes the following steps:

[0024] (1) Precursor preparation by spray drying method: Weigh 0.1g of copper chloride and dissolve it in 100mL of deionized water to obtain an aqueous solution of copper chloride; under stirring conditions, add the aqueous solution of copper chloride to 100mL with a concentration of 1mg / mL In the graphene oxide aqueous solution, stir evenly to obtain a mixed solution; spray-dry the mixed solution at a temperature of 150°C and a feed rate of 1 mL / min, and collect the product to obtain a precursor;

[0025] (2) Calcining to prepare composite materials: take 0.1g of the precursor prepared in step (1) and spread it on the bottom of the porcelain boat, place it in a tube furnace for calcination, and pass in argon at a rate of 100mL / min and keep argon throughout the process , The temperature is raised to 200°C at a temperature rise rate of 1°C / min, the temperature is ke...

Embodiment 3

[0027] The preparation method of the carbon dioxide electrochemical reduction catalyst includes the following steps:

[0028] (1) Precursor preparation by spray drying method: Weigh 0.5 g of copper chloride and dissolve it in 200 mL of deionized water to obtain a copper chloride aqueous solution; under stirring conditions, add the copper chloride aqueous solution to 200 mL with a concentration of 5 mg / mL In the graphene oxide aqueous solution, stir evenly to obtain a mixed solution; spray-dry the mixed solution at a temperature of 200°C and a feed rate of 10 mL / min, collect the product, and obtain a precursor;

[0029] (2) Calcining to prepare composite materials: Take 1g of the precursor prepared in step (1) and spread it on the bottom of the porcelain boat, place it in a tube furnace for calcination, and pass argon at a rate of 200 mL / min and keep the argon for the whole process. The temperature is raised to 300°C at a temperature rise rate of 5°C / min, and the temperature is kept...

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Abstract

The invention belongs to the technical field of electrochemical reduction of carbon dioxide, and specifically relates to a catalyst for the electrochemical reduction of carbon dioxide and a preparation method of the catalyst. The catalyst is a composite material of copper oxide-cuprous oxide composite graphene. The catalyst has high electrocatalytic activity and selectivity on the reduction of carbon dioxide, and in particular, can significantly improve the energy efficiency of carbon dioxide utilization; in addition, the preparation method has the advantages of simple operation, greenness, high yield, and broad application prospects.

Description

Technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and specifically relates to a carbon dioxide electrochemical reduction catalyst and a preparation method thereof. Background technique [0002] The large-scale application of fossil fuels has caused excessive emissions of carbon dioxide, and the increase in carbon dioxide in the atmosphere has led to global warming. In order to solve the above problems, people use renewable resources such as solar energy, wind energy, tidal energy, etc. to generate electric energy to electrochemically reduce excess carbon dioxide in the atmosphere and convert them into valuable industrial raw materials such as methane, methanol, and formic acid. The method of electrochemical reduction of carbon dioxide is a clean, efficient and environmentally friendly method. [0003] However, because carbon dioxide is one of the most thermodynamically stable carbon compounds, it requires high-energy r...

Claims

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Application Information

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IPC IPC(8): B01J23/72C25B3/04C25B11/06C25B3/25
CPCB01J23/002B01J23/72C25B11/04C25B3/25B01J35/33B01J35/39Y02P20/10
Inventor 王新王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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