Element doping is an effective strategy to enhance the selectivity of electrochemical carbon dioxide reduction. In this work, a dendritic core-shell In-doped [email protected]₂O catalyst is prepared by co-electrodeposition method on carbon fiber paper for selective electroreduction of CO₂ to CO. Faradaic efficiency of producing CO over this dendritic In-doped [email protected]₂O reaches 87.6 ± 2.2% with total current density of 11.1 ± 0.85 mA cm⁻² at −0.8 V vs RHE, which outperforms most of the reported Cu-based electrocatalysts. The excellent performance is mainly derived from charge re-distribution and the enhanced intrinsic activity due to the formation of In-doped Cu₂O layer. Meanwhile, the Cu⁺/Cu⁰ can be adjusted by tailoring the doped-In content. The relatively high ECSA and small charge transfer resistance are also conducive to improve the selectivity and activity. The oxyphilic In metal incorporated into the copper lattice can well stabilize the intermediate *COOH through enhancing interaction with O-ends of *COOH. This work provides a facile approach and a deep insight on design and synthesis of high efficiency hybrid electrocatalysts.

元素掺杂是增强电化学还原二氧化碳选择性的有效策略。在这项工作中，通过共电沉积方法在碳纤维纸上制备了树枝状核壳型In掺杂的[电子邮件保护的] ₂ O催化剂，用于将CO ₂选择性电还原为CO。 [受电子邮件保护] _{2 R}达到87.6±2.2％，相对于RHE在-0.8 V时的总电流密度为11.1±0.85 mA cm ^-2，优于大多数报道的基于铜的电催化剂。优异的性能主要来自电荷再分布和因形成In掺杂的Cu ₂ O层而增强的固有活性。同时，铜⁺ / Cu ⁰可以通过调整掺杂量来调整。较高的ECSA和较小的电荷转移电阻也有利于提高选择性和活性。并入铜晶格中的亲氧In金属可以通过增强与* COOH的O末端的相互作用来很好地稳定中间体* COOH。这项工作为高效混合电催化剂的设计和合成提供了一种简便的方法和深刻的见解。