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

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...

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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 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

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