Efficient Direct Air Capture in Industrial Cooling Towers Mediated by Electrochemical CO 2 Release
Direct air capture (DAC) is a promising technology for mitigating global climate change but suffers from low efficiency, small scale, and high cost due to the dilute atmospheric CO 2 , limited size of air contactors, and heat‐driven CO 2 release. Here, we propose combining DAC with widely used indus...
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| Published in | Angewandte Chemie International Edition Vol. 64; no. 5; p. e202412697 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Germany
27.01.2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1433-7851 1521-3773 |
| DOI | 10.1002/anie.202412697 |
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| Abstract | Direct air capture (DAC) is a promising technology for mitigating global climate change but suffers from low efficiency, small scale, and high cost due to the dilute atmospheric CO 2 , limited size of air contactors, and heat‐driven CO 2 release. Here, we propose combining DAC with widely used industrial cooling towers to extract CO 2 from the air and using electrolysis to release the captured CO 2 at room temperature. We first prepare a buffered absorbent solution consisting of sodium glycinate, glycine, and sodium chloride for effective CO 2 capture from the air, solving the incompatibility problem of the cooling towers with conventional absorbents. Next, we employ a three‐chamber electrolyzer for efficient release (≥95 %) of the captured CO 2 with high purity (≥98 %) by constant current electrolysis at room temperature, bypassing the conventional energy‐intensive heating process. The entire DAC system can operate stably for multiple cycles, and the mechanism for consecutive CO 2 capture and release is uncovered. This work reveals the great potential of running DAC in industrial cooling towers coupled with electrochemically‐driven CO 2 release, opening up new avenues for curbing the increasingly severe climate change. |
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| AbstractList | Direct air capture (DAC) is a promising technology for mitigating global climate change but suffers from low efficiency, small scale, and high cost due to the dilute atmospheric CO 2 , limited size of air contactors, and heat‐driven CO 2 release. Here, we propose combining DAC with widely used industrial cooling towers to extract CO 2 from the air and using electrolysis to release the captured CO 2 at room temperature. We first prepare a buffered absorbent solution consisting of sodium glycinate, glycine, and sodium chloride for effective CO 2 capture from the air, solving the incompatibility problem of the cooling towers with conventional absorbents. Next, we employ a three‐chamber electrolyzer for efficient release (≥95 %) of the captured CO 2 with high purity (≥98 %) by constant current electrolysis at room temperature, bypassing the conventional energy‐intensive heating process. The entire DAC system can operate stably for multiple cycles, and the mechanism for consecutive CO 2 capture and release is uncovered. This work reveals the great potential of running DAC in industrial cooling towers coupled with electrochemically‐driven CO 2 release, opening up new avenues for curbing the increasingly severe climate change. Direct air capture (DAC) is a promising technology for mitigating global climate change but suffers from low efficiency, small scale, and high cost due to the dilute atmospheric CO , limited size of air contactors, and heat-driven CO release. Here, we propose combining DAC with widely used industrial cooling towers to extract CO from the air and using electrolysis to release the captured CO at room temperature. We first prepare a buffered absorbent solution consisting of sodium glycinate, glycine, and sodium chloride for effective CO capture from the air, solving the incompatibility problem of the cooling towers with conventional absorbents. Next, we employ a three-chamber electrolyzer for efficient release (≥95 %) of the captured CO with high purity (≥98 %) by constant current electrolysis at room temperature, bypassing the conventional energy-intensive heating process. The entire DAC system can operate stably for multiple cycles, and the mechanism for consecutive CO capture and release is uncovered. This work reveals the great potential of running DAC in industrial cooling towers coupled with electrochemically-driven CO release, opening up new avenues for curbing the increasingly severe climate change. |
| Author | Zheng, Ao‐Chuan Daasbjerg, Kim Hu, Xin‐Ming Zou, Ye‐Bin Du, Lin Zhang, Qiang |
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| Keywords | Direct air capture Scalability Industrial cooling tower Electrochemical CO2 release Buffered absorbent solution |
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| Title | Efficient Direct Air Capture in Industrial Cooling Towers Mediated by Electrochemical CO 2 Release |
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