Mass-Preparation Of Bismuth-Supported Two-Dimensional Tin Oxide From Liquid Metal And Its Application In Electrocatalytic Reduction Of Carbon Dioxide

Liquid metals,as a new research field in recent years,have attracted much attention due to their unique physical and chemical properties.When the liquid metal is exposed to oxygen,a self-limiting oxide film is formed,and a two-dimensional（2D）metal oxide film can be obtained by a certain peeling method,which provides a new strategy for the preparation of two-dimensional materials.The gas injection method means that after injecting O₂ into the liquid metal,a metal oxide is formed on the metal surface layer,and at the same time,the 2D oxides are stripped and dispersed by the dispersant on the upper layer of the liquid metal.Based on the previous research,this paper optimized the gas injection method and successfully prepared a mass of amorphous tin oxide nanosheets loaded with bismuth,and used the material in the electrocatalytic CO₂reduction reaction.The research contents of this paper are summarized as follows:（1）A heatable gas injection device is designed,and the gas injection method is applied to a metal system with a higher melting point.Different alloy systems were screened out by the optimized gas injection method.It was found that SnBi alloy can continuously prepare Bi single-atom/particle-loaded amorphous tin oxide nanosheets（Bi/a-SnO_x NSs）,and the material was studied in detail;（2）Compared with other alloy systems,the SnBi alloy system can continue to produce high-quality 2D materials.Based on this phenomenon,it has been deeply explored.The results show that organic dispersants with different functional groups can affect the preparation of high-quality nanosheets,and Bi plays a certain auxiliary role in it;（3）The performance of Bi/a-SnO_x NSs materials in the electrocatalytic reduction of CO₂was explored.The results show that the formic acid selectivity of the material can reach more than 90%;by adjusting the content of Bi on the nanosheets,it is found that the content can affect the formic acid selectivity of the material.