Bi/Zn Dual Single-Atom Catalysts for Electroreduction of CO₂ to Syngas

The electrochemical CO₂ reduction reaction to produce CO is one of the most promising pathways to eliminate CO₂ emissions and store intermittent energy sources. However, the most critical usage of CO is via mixing with H₂ to form syngas, which is a crucial feedstock for many value-added chemicals. Therefore, producing syngas with a suitable CO/H₂ ratio in a one-step reaction is desirable in the CO₂RR process. To achieve this end, dual single-atom sites supported by the nitrogen-doped carbon show great potential. Herein, we show that a dual single-atom catalyst with Bi−N₄ and Zn−N₄ units is efficient for generating syngas with tunable CO/H₂ ratios (0.20 to 2.92), which is of great significance to downstream industrial production. Moreover, this work highlights the potential to control the CO/H₂ ratios for efficient syngas production using the coexisting single-atom sites.