Single-Atom Rh 1 Alloyed Co for Urea Electrosynthesis from CO 2 and NO 3 .

Single-atom Rh 1 alloyed Co (Rh 1 Co) is explored as an efficient catalyst for urea electrosynthesis via coelectrolysis of CO 2 and NO 3 - (UECN). Theoretical calculations and in situ spectroscopic measurements unravel the synergetic effect of Co and Rh 1 in promoting the UECN process, where the Rh 1 site activates NO 3 - to form *NH 2 , while the Co site activates CO 2 to form *CO. The formed *CO then desorbs from the Co site and transfers to the Rh 1 site, followed by continuous C-N coupling with *NH 2 formed on the Rh 1 site to synthesize urea. Remarkably, Rh 1 Co assembled in a flow cell delivers the exceptional urea yield rate of 24.9 mmol h -1 g -1 and Faradaic efficiency of 51.1%, outperforming most previously reported UECN catalysts.