Carbon dioxide electrochemical reduction catalyst and preparation method thereof and catalyst loaded gas diffusion electrode

A technology of gas diffusion electrode and carbon dioxide, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve high overpotential, reduce formic acid yield, and accelerate hydrogen evolution Speed ​​and other issues, to achieve the effect of inhibiting hydrogen evolution reaction, solving the problem of low reduction current and reducing energy consumption

Inactive Publication Date: 2018-10-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example: metal tin has a strong selectivity to 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 ...

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  • Carbon dioxide electrochemical reduction catalyst and preparation method thereof and catalyst loaded gas diffusion electrode
  • Carbon dioxide electrochemical reduction catalyst and preparation method thereof and catalyst loaded gas diffusion electrode
  • Carbon dioxide electrochemical reduction catalyst and preparation method thereof and catalyst loaded gas diffusion electrode

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[0031] The present invention also provides a preparation method of a carbon dioxide electrochemical reduction catalyst, comprising the following steps:

[0032] Dissolve copper chloride or tin chloride, and nickel chloride in deionized water, stir, add ammonia water drop by drop to adjust the pH of the solution to 7.5-14, make the above metal ions co-precipitate, centrifuge, use deionized water and Wash with absolute ethanol until neutral, dry, and heat treat to obtain nickel-copper lamellar double metal oxide or nickel-tin lamellar double metal oxide. The heat treatment temperature is 250°C to 750°C, and the heat treatment time is 0.5 hours to 4 hours The most preferred reaction conditions are that the pH is 9, the heat treatment temperature is 350°C-450°C, and the heat treatment time is 3 hours. Preferably, the molar concentration ratio of the copper chloride to the nickel chloride is 1:9-9:1, and the molar concentration ratio of the tin chloride to the nickel chloride is 1:...

Embodiment 1

[0041] An electrochemical reduction catalyst for carbon dioxide, comprising a nickel-copper lamellar double metal oxide, the nickel-copper lamellar double metal oxide is synthesized by a co-precipitation method, and its preparation method is: take 2mmol copper chloride dihydrate, 8mmol Dissolve nickel chloride hexahydrate in 40mL deionized water in a beaker, dissolve 5mL of concentrated ammonia water in 45mL deionized water, add dropwise to the beaker until the pH value is 9, stir for 4h, centrifuge, use deionized water and no Wash with water and ethanol until neutral, and dry in a drying oven at 60°C to obtain a solid powder. The powder was ground and placed in a tube furnace and heated in air at 350 °C for 3 h to obtain a nickel-copper sheet-layer bimetallic oxide (the molar ratio of NiO / CuO was 8:2), which was used as a catalyst for the electrochemical reduction of carbon dioxide.

Embodiment 2

[0043] An electrochemical reduction catalyst for carbon dioxide, comprising a nickel-copper lamellar double metal oxide, the nickel-copper lamellar double metal oxide is synthesized by a co-precipitation method, and its preparation method is: take 2mmol copper chloride dihydrate, 8mmol Dissolve nickel chloride hexahydrate in 40mL deionized water in a beaker, dissolve 5mL of concentrated ammonia water in 45mL deionized water, add dropwise to the beaker until the pH value is 9, stir for 4h, centrifuge, use deionized water and no Wash with water and ethanol until neutral, and dry in a drying oven at 60°C to obtain a solid powder. The powder was ground and placed in a tube furnace and heated in air at 450 °C for 3 h to obtain a nickel-copper sheet-layer bimetallic oxide (the molar ratio of NiO / CuO was 8:2), which was used as a catalyst for the electrochemical reduction of carbon dioxide.

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Abstract

The invention relates to the technical field of electrochemical reduction catalysts, in particular to a carbon dioxide electrochemical reduction catalyst and a preparation method thereof and a catalyst loaded gas diffusion electrode. The carbon dioxide electrochemical reduction catalyst is of a nano-catalyst and is specifically a nickel-copper lamellar bimetallic oxide with a composite lamellar structure of nickel-copper oxide and copper oxide, or nickel-tin lamellar bimetallic oxide with a composite lamellar structure of nickel oxide and tin oxide. The nano-catalyst with the structure is highin catalytic activity, overpotential in electrochemical reduction process is greatly reduced, and meanwhile, hydrogen evolution reaction in the process of carbon dioxide reduction is effectively restrained. The invention further provides the preparation method of the catalyst and the catalyst loaded gas diffusion electrode, the problem about excessive low reduction current can be solved, and theFaradic efficiency in the electrochemical reduction of carbon dioxide is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical reduction catalysts, in particular to a carbon dioxide electrochemical reduction catalyst, a preparation method thereof, and a gas diffusion electrode loaded with the catalyst. Background technique [0002] The large-scale application of fossil fuels has caused excessive emissions of carbon dioxide, which has led to global warming due to the increase of carbon dioxide in the atmosphere. In order to solve the above problems, people use renewable resources such as solar energy, wind energy, and tidal energy to generate electric energy to electrochemically reduce excess carbon dioxide in the atmosphere and convert it into valuable industrial raw materials such as methane, methanol, formic acid, etc. Therefore, the electrochemical reduction of carbon dioxide is a clean, efficient and environmentally friendly method. [0003] However, since CO2 is one of the most thermodynamically stable carbo...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/00B01J37/03C25B3/04C25B11/06C25B3/25
CPCB01J23/755B01J35/0033B01J37/03C25B3/25C25B11/091
Inventor 徐维林吕涛阮明波宋平张玉微杨发
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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