Future Perspective On Materials, Electrochemistry, and Cell Concepts for Redox‐Mediated CO 2 Direct Air Capture Scenarios

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Abstract
Anthropogenic emissions of previously sequestered carbon continue to disrupt the natural carbon cycle, driving atmospheric carbon dioxide (CO 2 ) concentrations beyond 420 ppm. This has resulted in global temperatures rising beyond 1.5 °C above the pre‐industrial level. Direct air capture (DAC) of CO 2 has emerged as a complementary mitigation strategy. However, current DAC technologies are limited by the high energy requirements inherent to the thermal release of captured CO 2 , which are caused by the low thermodynamic efficiency of heat‐driven processes, as constrained by Carnot principles. Redox‐mediated electrochemical carbon capture (RMECC) offers a promising pathway to overcome these limitations. RMECC with DAC application remains in an early developmental stage and requires further optimization to enable energy‐efficient, cost‐effective, and scalable deployment. In this perspective the design of sorbents, electrolytes, and electrochemical cell configurations in the field of RMECC are discussed with an emphasis on sustainable approaches for the demands of DAC applications. The challenges arising from the atmospheric dilution of CO 2 within the more abundant and disruptive competitor oxygen are highlighted as a critical factor influencing sorbent performance. Recent advancements in RMECC are reviewed, key challenges are identified, and future directions are outlined to accelerate electrochemically mediated DAC towards practical implementation.

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