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Electrified reversible surface mineralization of CO2 for direct air capture
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DOI：10.1038/s41560-026-01989-9.png)
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Abstract
En 中文
Electrified CO2 capture and release from air offers net-negative emissions, but today’s liquid-carbonate-based systems have a high energy cost (6–10 GJ per ton of CO2), and organic sorbents are oxygen sensitive. Here we report electrified CO2 surface mineralization/demineralization capture/release, wherein an inorganic capture sorbent, MnO2, is electrochemically reduced/activated to generate Mn(III), which mineralizes CO2 to form MnOOCO2H (operando Raman); the process is reversed under oxidative potential. This approach is built upon Mn redox reaction that resides within the water-stable bracket, offering tunable driving force (kinetics/productivity) with applied potential (energy). After optimizing the electrochemical protocol, we capture from air (0.04% CO2 and 21% O2) at 4.1 GJ per ton of CO2, with capacity and kinetics comparable to prior sorbents, low sensitivity to oxygen/humidity, 80% single-pass CO2 capture ratio and release under a pure CO2 carrier gas stream and pressure drop <150 Pa. The system operates >1,000 h with >90% capacity retention and scales to 20 cm2 without loss; remaining challenges include material utilization, electrolyte, gas flow/pressure drop and CO2-purity management. Electrified CO2 capture from air could lead to net-negative emissions, yet current methods face high energy costs and sensitivity to oxygen. Here the authors introduce an electrochemical approach using MnO2 as a stable, redox-active sorbent, achieving CO2 capture with promising energy consumption and minimal oxygen sensitivity.
Keywords:
Carbon capture and storage
Electrochemistry
Energy
general
Energy Policy
Economics and Management
Energy Systems
Energy Storage
Renewable and Green Energy
Journal
IF:
60.1
Papers:
987
Citations:
5.6W