Accelerate Mass Transport of Proton and Carbon Sources by Super‐Hygroscopic and Porous Nanosheets for Continuous CO 2 ‐To‐Ethylene Upgrade

作者：Silong Dong, Guobin Wen, Xinyu Yang, Xiaowen Zhang, Shuxuan Liu, Haoyang Xiong, Yinyi Liu, Kai Zong, Hao Li, Yifan Li, Yi Cui, Bohua Ren, Xin Wang, Ming-Liang Jin, Zhongwei Chen · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202502306 · 被引用次数：1 · 研究领域：CO2 Reduction Techniques and Catalysts、Covalent Organic Framework Applications、Membrane Separation and Gas Transport

Abstract Gas‐water/catalyst triple‐phase interface and the microenvironment play critical roles in the reaction kinetics and production rate of electrochemical carbon dioxide reduction reactions (CO 2 RR), which steer concerted proton‐electron transfer steps. Inspired by Tillandsia leaves, which efficiently capture H 2 O and CO 2 from the air, copper nanosheets with dual‐functional channels are we designed: the superhygroscopic network enables capillary condensation, converting H 2 O(g) into H 2 O(l) to form H 2 O channels that ensure a stable supply of protons, while the CO 2 channels formed by the microporous structure enhance the diffusion of CO 2 , thus enriching the carbon source. This synergistic design creates an optimal microenvironment for CO 2 conversion by simultaneously delivering both protons and CO 2 to the reaction interface. Time‐of‐flight secondary‐ion mass spectroscopy (TOF‐SIMS), X‐ray absorption spectroscopy (XAS) and multiphysics simulations further reveal the designed H 2 O and CO 2 channels in the microenvironment to boost mass transports. Hence, the Faradaic efficiency (FE) for ethylene reaches up to 96% at ‐200 mA cm −2 with such localized triple‐phase interfaces, which simultaneously exhibits ultra‐high stability for over 170 h in the membrane electrode assembly (MEA) system. This strategy provides a construction methodology of H 2 O and CO 2 channels for improving the selectivity and stability of electrochemical CO 2 upgrades.