Direct air capture (DAC) technologies have traditionally focused on dry sorbent-based systems, yet these approaches often require energy-intensive regeneration and exhibit reduced performance under variable environmental conditions. In this work, we propose an alternative aqueous-phase DAC pathway that integrates reactive capture and electrochemical conversion without the need for CO₂ desorption. A novel tetraalkylammonium-based absorbent was developed, enabling efficient CO₂ uptake directly from ambient air and subsequent conversion into value-added products via electrochemical reduction. Pilot-scale experiments demonstrated the absorbent’s high capacity and stability, and process modeling confirmed its compatibility with continuous operation. Techno-economic analysis (TEA) and life cycle assessment (LCA) reveal that the aqueous DAC–conversion process can significantly reduce energy consumption and carbon footprint compared to conventional DAC systems. These results highlight the promise of aqueous-phase reactive capture and conversion as a viable, energy-efficient alternative to traditional DAC technologies.
