Defect-rich bismuth metallene for efficient CO2 electroconversion

High-quality Bi metallene (Bi ML) was quickly achieved by an ultrasound-assisted galvani replacement reaction, in which the self-assembly of Bi nanocrystal subunits contributed to the formation of Bi ML. Bi ML shows high activity and selectivity for the CO 2 RR, accompanied by good stability. The atomic vacancy can change the electronic structure of the surrounding atoms and the adsorption profile of reaction intermediates, which contribute to the activity enhancement of Bi ML for the CO 2 RR.