Tailoring the CO and H Coverage for Selective CO 2 Electroreduction to CH 4 or C 2 H 4

In the electrochemical CO reduction reaction (CO RR), the coverages of CO and H intermediates on a catalyst surface are critical for the selective generation of C or C products. In this work, we have synthesized several Cu Zn Mn ternary alloy electrocatalysts, including Cu ZnMn, Cu Zn Mn, and Cu ZnMn , by varying the doping compositions of Zn and Mn, which are efficient in binding CO and H adsorbates in the CO electroreduction process, respectively. The increase of H coverage allows to promotion of the CH and H formation, while the increase of the CO coverage facilitates the production of C H and CO. As a result, the Cu ZnMn catalyst presented a high CO -to-CH partial current density (-418 ± 22 mA cm ) with a Faradaic efficiency of 55 ± 2.8%, while the Cu Zn Mn catalyst exhibited a CO -to-C H partial current density (-440 ± 41 mA cm ) with a Faradaic efficiency of 58 ± 4.5%. The study suggests a useful strategy for rational design and fabrication of Cu electrocatalysts with different doping for tailoring the reduction products.