Carbon dioxide (CO₂) and absorbent regeneration are the most energy-intensive processes in carbon capture loops. Conventional carbon capture technologies typically consume substantial amounts of heat and involve multiple steps for regeneration. Here we demonstrated one-step electrochemical regeneration of CO₂ and alkaline absorbent from carbon-containing solutions in a modular porous solid electrolyte (PSE) reactor. By performing hydrogen evolution and oxidation redox reactions, our PSE reactor selectively split NaHCO₃/Na₂CO₃ solutions, which typically come from air contactors after CO₂ absorption, into NaOH absorbent in the catholyte and high-purity CO₂ gas in the PSE layer. No chemicals were consumed and no by-products were generated. High Na⁺-ion transport number (~90%), high capture capacity retention (~90%), low energy consumptions (50 kJ mol_CO2⁻¹ and 118 kJ mol_CO2⁻¹ at 1 mA cm⁻² and 100 mA cm⁻² for bicarbonate, respectively) and long-term stability (>100 hours) were demonstrated. We achieved industrially relevant carbon regeneration rates of up to 1 A cm⁻² (~18 mmol cm⁻² h⁻¹), highlighting the promising application potential.

二氧化碳 （CO₂） 和吸收剂再生是碳捕获循环中最耗能的过程。传统的碳捕获技术通常会消耗大量热量，并涉及多个再生步骤。在这里，我们展示了在模块化多孔固体电解质 （PSE） 反应器中从含碳溶液中对 CO₂ 和碱性吸收剂进行一步电化学再生。通过进行析氢和氧化氧化还原反应，我们的 PSE 反应器选择性地将 NaHCO₃/Na₂CO₃ 溶液（通常在 CO₂ 吸收后来自空气接触器）分离成阴极中的 NaOH 吸收剂和 PSE 层中的高纯度 CO₂ 气体。没有消耗任何化学品，也没有产生任何副产品。高 Na ⁺ 离子传输数 （~90%）、高捕获容量保留 （~90%）、低能耗（碳酸氢盐在 1 mA ^cm-2 和 100 mA ^cm-2 下分别为 50 kJ mol_CO2-1 和 118 kJ mol_CO2-1）和长期稳定性（>100 小时）。我们实现了高达 1 A ^cm-2 （~18 mmol ^{cm-2 h-1}） 的工业相关碳再生速率，突出了有前途的应用潜力。