Promoting CO2Release from CO32--Containing Solvents during Water Electrolysis for Direct Air Capture

Xin Gao, Ayokunle Omosebi, Roger Perrone, Kunlei Liu

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The pH swings from water electrolysis are leveraged to condition OH-based facile CO2 capture solvents using an electrochemical flow cell for direct air capture (DAC). Besides demonstrating the DAC using a membrane contactor, promoting CO2 release from a CO32- solution at the anode is specifically studied by adjusting the volumetric flow rate, anode chamber volume, residence time, and K2CO3 concentration. Through case-by-case comparisons coupled with modeled results, increasing current, reducing volumetric flow rate, and/or reducing CO32- concentration are the effective methods to promote CO2 release from a CO32-containing solvent, whereas enlarging the anode chamber volume poses a minor effect. Moreover, the discrepancies between the experimental and modeled results may be caused by H+ crossover rather than K+ transport through the Nafion membrane during water electrolysis based upon the total alkalinity measurements for the K2CO3 solutions gleaned from the anode. It is believed that such results will provide guidance to design and operate an electrochemical flow cell for electrochemistryassisted DAC and point source CO2 capture.

Original languageEnglish
Article number044527
JournalJournal of the Electrochemical Society
Issue number4
StatePublished - Apr 1 2022

Bibliographical note

Publisher Copyright:
© 2022 The Electrochemical Society ("ECS").

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry


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