Bismuth single crystal material and preparation method and application thereof

Abstract

The invention discloses a preparation method of a dodecahedral bismuth nano single crystal catalyst and application of the dodecahedral bismuth nano single crystal catalyst in high-activity, high-product-selectivity and high-energy-efficiency electrochemical reduction of carbon dioxide under neutral and alkaline conditions. The catalyst is composed of dodecahedron bismuth nano single crystals and conductive carbon black, and the dodecahedron bismuth nano single crystals selectively expose large-area high-activity (104) and (110) crystal faces, so that the activity of generating formic acid through electrochemical reduction of carbon dioxide is effectively improved, the overpotential required for forming formic acid is reduced, and the catalytic activity of the catalyst is improved. The high-selectivity potential interval of formic acid is widened, and high-yield production of formic acid and high-energy-efficiency electrochemical reduction of carbon dioxide are realized.

Description

technical field [0001] The application relates to a bismuth single crystal material and its preparation method and application, belonging to the field of catalysts. Background technique [0002] The massive combustion of traditional fossil raw materials (coal, oil and natural gas, etc.) has resulted in a sharp increase in the content of carbon dioxide in the atmosphere. Carbon dioxide in the atmosphere can absorb and reflect the infrared rays emitted by the earth, so excess carbon dioxide gas causes the global average temperature to rise year by year, leading to global warming, and also leads to a series of ecological and environmental problems such as ocean acidification, land desertification, and frequent extreme weather. The living environment brings a strong negative impact. How to reduce the concentration of carbon dioxide in the atmosphere and how to redevelop and utilize carbon dioxide has become one of the key research topics in the international academic and scient...

AI Technical Summary

Problems solved by technology

However, the overpotential required for the electrochemical reduction of carbon dioxide by bismuth-based materials reported so far is relatively high, and their catalytic activity needs to be further improved to lower the reaction energy barrier, thereby improving the energy conversion efficiency of the reaction system.

In addition, because the electrochemical reduction of carbon dioxide is usually accompanied by the side reaction of electrolyzing water to generate hydrogen, the literature reports that bismuth-based materials electrochemically reduce carbon dioxide to produce formic acid with a narrow potential range, resulting in a low yield of formic acid.

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