Preparation method and application of boron-nitrogen co-coordinated copper monatomic catalyst

Abstract

The invention discloses a preparation method and application of a boron-nitrogen co-coordinated copper monatomic catalyst, urea / cyanamide, PEG-2000, boric acid, copper nitrate trihydrate and deionized water are mixed according to a certain mass volume ratio, reflux heating is performed, cooling is performed, rotary evaporation is performed until a solvent is volatilized and solute is crystallized and separated out, crystals obtained through rotary evaporation are fully and uniformly ground, and the boron-nitrogen co-coordinated copper monatomic catalyst is obtained. According to the BCN-Cu catalyst, B and N co-coordinated Cu monatomic catalyst is obtained by fully pyrolyzing carbon nanotubes in a tubular furnace in an argon atmosphere, in the BCN-Cu catalyst, the B and N co-uniformly doped carbon nanotubes form a carrier BCN, and Cu is dispersed on the surface of the BCN carrier in an atomic scale. According to the BCN-Cu monatomic catalyst, Cu monatomic is stabilized through common coordination of B and N, the electronic structure of the center of the Cu monatomic is effectively adjusted, and the BCN-Cu monatomic catalyst shows excellent activity and methane selectivity in the CO2 electrochemical reduction reaction.

Description

technical field [0001] The invention relates to the technical field of metal single-atom catalysts, in particular to a preparation method and application of a boron-nitrogen co-coordinated copper single-atom catalyst. Background technique [0002] Current CO 2 There are many conversion methods, among which the electrochemical reduction method is due to mild reaction conditions (normal temperature, normal pressure), good controllability (the reaction activation energy on the electrode surface can be directly controlled by controlling the electrode reaction potential), and a wide range of energy sources (reduction process. The electricity demand can come from renewable energy such as solar energy, wind energy, geothermal energy and tidal energy) and the advantages of environmental friendliness have attracted much attention. [0003] in CO 2 Compared with bulk electrode materials, metal nanocatalysts have been widely studied in electrochemical reduction reactions due to their...

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Problems solved by technology

[0004] Currently in CO 2 Copper (Cu) is widely used in the field of electrochemical reduction, but the coordination structure of Cu-based single-atom catalysts reported in the literature is limited, and most of them are Cu-N coordinated with nitrogen (N) or oxygen (O). or Cu-O structure, applied to CO 2 Most of the products obtained during electrochemical reduction are carbon monoxide (CO), and the activity of the catalyst is also very limited, making it difficult to achieve a stable conversion of CO at a large current density. 2 , under a large working current, the single-atom structure of the catalyst is also easy to migrate and agglomerate into nanoparticles, thus losing the high selectivity of the original single-atom center

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