Chlorine‐Doped SnO 2 Nanoflowers on Nickel Hollow Fiber for Enhanced CO 2 Electroreduction at Ampere‐Level Current Densities

作者：Yiheng Wei, Xiaotong Wang, Jianing Mao, Yanfang Song, Yanfang Song, Huanyi Zhu, Xiaohu Liu, Cheng Luo, Shoujie Li, Aohui Chen, Guihua Li, Xiao Dong, Wei Wei, Wei Wei, Wei Chen · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202423370 · 被引用次数：28 · 研究领域：CO2 Reduction Techniques and Catalysts、Advanced Photocatalysis Techniques、Electrocatalysts for Energy Conversion

Abstract Renewable energy‐driven electrochemical CO 2 reduction has emerged as a promising technology for a sustainable future. However, achieving efficient production of storable liquid fuels at ampere‐level current densities remains a significant hurdle in the large‐scale implementation of CO 2 electroreduction. Here we report a novel catalytic electrode comprising chlorine‐doped SnO 2 nanoflowers arrayed on the exterior of three‐dimensional nickel hollow fibers. This electrode demonstrates exceptional electrocatalytic performance for converting CO 2 to formate, achieving a remarkable formate selectivity of 99 % and a CO 2 single‐pass conversion rate of 93 % at 2 A cm −2 . Furthermore, it exhibits excellent stability, maintaining a formate selectivity of above 94 % for 520 h at a current density of 3 A cm −2 . Experimental results combined with theoretical calculations confirm that the enhanced mass transfer facilitated by the hollow fiber penetration effect, coupled with the well‐retained Sn 4+ species and Sn−Cl bonds, synergistically elevates the activity of CO 2 conversion. The incorporation of chlorine into SnO 2 enhances electron transport and CO 2 adsorption, substantially lowering the reaction energy barrier for the crucial intermediate *OCHO formation, and boosting the formate production.