Preparation method of two-dimensional ultrathin bismuthene nanosheet material and application of two-dimensional ultrathin bismuthene nanosheet material in photocatalytic CO2 reduction conversion

The invention belongs to the field of low-dimensional material design and photocatalytic application, and discloses a preparation method of a two-dimensional ultrathin bismuthene nanosheet and application of the two-dimensional ultrathin bismuthene nanosheet in photocatalytic CO2 reduction conversion. Bi (NO3) 3.5 H2O is used as a bismuth source, urotropine is used as a reducing agent, and the ultrathin two-dimensional bismuthene nanosheet is prepared through a low-temperature solvothermal method. Defective energy levels are generated in an induction energy band of abundant unsaturated coordination dangling bonds at the edge of the ultrathin two-dimensional bismuthene nanosheet, so that the service life of photo-induced electrons can be prolonged, and bismuth atoms at the edge are used as main active sites for CO2 reduction, so that reaction energy barriers are effectively reduced. Under illumination, the yield of CO and CH4 generated by photocatalytic reduction of CO2 through bismuthene is far higher than th