Revealing the Doping Effect of Cu2+ on SrSnO3 Perovskite Oxides for CO2 Electroreduction

Abstract In this study, SrSnO 3 , 0.5 wt %‐SS and 1 wt %‐SS (SrSnO 3 loaded with 0.5 wt % Cu 2+ and 1 wt % Cu 2+ , respectively) catalysts were designed using a simple and versatile strategy to investigate the changes of products selectivity in CO 2 electroreduction (CER) induced by doping Cu 2+ on SrSnO 3 perovskite oxide. Both SrSnO 3 and 0.5 wt %‐SS showed a consistent trend for the selectivity of HCOOH. While 1 wt %‐SS showed a significant change in product selectivity and the FE CO reached a maximum at −1.53 V with a value of 49 %. The sufficient Cu 2+ loaded on the surface of 1 wt %‐SS worked as the actual active sites during the CER and adjusted the pathway of product generation of SrSnO 3 in the CER process, subsequently promoting the generation of CO and achieving regulation of the CER product selectivity. This work may stimulate more attention on the design of the Cu‐based perovskite oxide catalyst for CER.