The conversion of carbon dioxide (CO₂) into valuable chemicals is a key strategy for carbon utilization. Although tandem CO₂ electrolysis has shown promise, it has been largely confined to watt-scale studies and larger-scale studies are needed to accelerate commercialization. In this work, we demonstrate a tandem CO₂ electrolyzer engineered for the production of multicarbon products, acetate and ethylene, at the kilowatt (kW) scale. Here, from insights gained at the watt scale, we have successfully designed and operated a 1,000 cm² CO electrolyzer at 0.71 kW and a 500 cm² CO₂ electrolyzer at 0.40 kW. The kW-scale CO electrolyzer stack demonstrated a stable current of 300 A over 125 h, yielding 98 l of 1.2 M acetate at 96% purity. The system exhibited resilience against typical industrial impurities, maintaining high performance. These results mark a crucial advancement in scaling tandem CO₂ electrolysis systems toward industrial feasibility. Finally, an experimentally informed techno-economic analysis is offered to provide a pathway for commercially viable tandem CO₂ electrolysis at an industrial scale.

将二氧化碳（CO ₂ ）转化为有价值的化学品是碳利用的关键策略。尽管串联 CO ₂ 电解已显示出前景，但它在很大程度上仅限于瓦特规模的研究，需要更大规模的研究来加速商业化。在这项工作中，我们展示了一种串联 CO ₂ 电解槽，专为生产千瓦 (kW) 规模的多碳产品、醋酸盐和乙烯而设计。在这里，根据瓦特级的见解，我们成功设计并运行了 0.71 kW 的 1,000 cm ² CO 电解槽和 500 cm ² CO ₂ 0.40 kW 电解槽。千瓦级 CO 电解槽在 125 小时内表现出 300 A 的稳定电流，产生 98 升 1.2 M 乙酸盐，纯度为 96%。该系统表现出对典型工业杂质的抵抗力，保持高性能。这些结果标志着串联 CO ₂ 电解系统在工业可行性方面取得了重大进展。最后，提供了基于实验的技术经济分析，为工业规模的商业上可行的串联 CO ₂ 电解提供了一条途径。