The practical implementation of electrochemical CO₂ reduction technology is greatly challenged by notable CO₂ crossover to the anode side, where the crossed-over CO₂ is mixed with O₂, via interfacial carbonate formation in traditional CO₂ electrolysers. Here we report a porous solid electrolyte reactor strategy to efficiently recover these carbon losses. By creating a permeable and ion-conducting sulfonated polymer electrolyte between cathode and anode as a buffer layer, the crossover carbonate can combine with protons generated from the anode to re-form CO₂ gas for reuse without mixing with anodic O₂. Using a silver nanowire catalyst for CO₂ reduction to CO, we demonstrated up to 90% recovery of the crossover CO₂ in an ultrahigh gas purity form (>99%), while delivering over 90% CO Faradaic efficiency under a 200 mA cm⁻² current. A high continuous CO₂ conversion efficiency of over 90% was achieved by recycling the recovered CO₂ to the CO₂ input stream.

_{电化学CO 2}还原技术的实际实施受到显着的CO ₂交叉到阳极侧的巨大挑战，其中交叉的CO _{2通过传统CO 2}电解槽中的界面碳酸盐形成与O _2混合。在这里，我们报告了一种多孔固体电解质反应器策略来有效地恢复这些碳损失。通过在阴极和阳极之间形成可渗透的离子导电磺化聚合物电解质作为缓冲层，交叉碳酸盐可以与阳极产生的质子结合，重新形成 CO ₂气体以供重复使用，而无需与阳极 O ₂混合。使用银纳米线催化剂制备 CO ₂还原为 CO，我们展示了高达 90% 的超高纯度气体 (>99%) 的交叉 CO _{2回收率，同时在 200 mA cm} ^{- 2}电流下提供超过 90% 的 CO 法拉第效率。通过将回收的 CO ₂循环到 CO ₂输入流中，实现了超过 90%的高连续 CO _{2转化效率。}