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Closed-Loop and Precipitation-Free CO Capture Process Enabled by Electrochemical pH Gradient. | LitMetric

Closed-Loop and Precipitation-Free CO Capture Process Enabled by Electrochemical pH Gradient.

ChemSusChem

School of Physical Science and Technology, ShanghaiTech University, 393 Huaxia Middle Road, Shanghai, 201210, China.

Published: October 2024

AI Article Synopsis

  • Carbon dioxide (CO2) capture is essential for combating climate change, prompting the development of efficient and eco-friendly methods for its extraction.* -
  • The described flow cell captures CO2 from air or flue gas using electrolysis without an ion-exchange membrane, producing acidic and alkaline solutions that facilitate CO2 concentration.* -
  • This cyclic process, which avoids calcium carbonate precipitation, simplifies CO2 separation and demonstrates potential for effective scaling in diverse applications.*

Article Abstract

Carbon dioxide (CO) capture is a crucial negative-emission technology for the mitigation of climate change and global warming. The urgent need of combating climate change motivates the research and development of economical, effective and environmentally benign processes for CO capture. Herein, we design and report a flow cell for the CO capture from air or flue gas in a precipitate-free and closed-loop manner. No ion-exchange membrane is used in the electrolyser. The water electrolysis produces acidic solution near the anode and alkaline solution near the cathode, while generating valuable hydrogen and oxygen byproducts. The dilute CO in air or flue gas is captured by the alkaline solution, which is then mixed with the acidic solution to release the concentrated CO. The process operates in a cyclic manner as driven by the water electrolysis and the mechanical pumping. No precipitation of calcium carbonate is involved for fixing CO, which may simplify the separation process and minimizing the materials loss. The simple process enabled by electrochemical pH gradient shows promise for efficient CO capture on both small and large scales.

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Source
http://dx.doi.org/10.1002/cssc.202401533DOI Listing

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