Abstract Electrochemical CO 2 reduction (CO 2 R) powered with renewable electricity has been considered as a promising approach for carbon emission mitigation and sustainable production of value‐added chemicals. Developing active and selective electrocatalysts capable of achieving high multi‐carbon product selectivity at low overpotentials remains a critical challenge. In this work, we develop a lanthanum (La) doping strategy to optimize Cu‐based catalysts for enhanced CO 2 R performance. As a result, the optimized La‐modified CuO catalyst achieves a remarkable Faradaic efficiency of over 75% toward multi‐carbon products at a modest potential of approximately −0.5 V versus reversible hydrogen electrode, achieving a practical relevant current density of over 200 mA cm −2 . This high selectivity represents a twofold enhancement over state‐of‐the‐art CuO‐based catalysts under identical conditions. Detailed kinetic assessments and mechanistic investigations reveal that La incorporation enhance *CO binding strength on Cu and facilitate COCO dimerization, thereby facilitating the production of multi‐carbon products. Overall, this work establishes an effective approach for boosting multi‐carbon production through strategic rare‐earth element modification, thereby advancing the development of efficient CO 2 R systems for sustainable chemical synthesis. image
Wang et al. (Mon,) studied this question.