Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.115
Publication date: 11th July 2022
Integrating the alkaline capture of CO2 from the air with the electrochemical conversion of the obtained (bi)carbonate solution in one and the same system is among the most promising strategies in the field of Carbon Capture & Utilization (CCU) technologies. Thus far this approach has received little or no attention as a consequence of the challenging conversion of CO2 from bicarbonate solutions as it mostly results in low Faradaic Efficiency (FE) and partial Current Density (CD) towards carbon products during the electrolysis and owing to the parasitic hydrogen evolution reaction (HER). Very recently, thanks to the advances in reactor design and in the understanding of the mechanism of bicarbonate electrolysis, promising results were obtained in terms of performance (i.e., >60% FE towards formate or CO at >50 mA cm-2) [1] and as such provided us with the required knowhow to for the first time, construct and validate a proof-of-concept experimental setup where CO2 is captured from the air with KOH, in the form of a 0.7 M (bi)carbonate solution, through Direct Air Capture and then converted to formate or CO in a zero-gap flow electrolyzer using a bipolar membrane in a Membrane-Electrode Assembly (MEA). The presented results provide a new opportunity towards upscaling the electrochemical conversion of CO2, since integrating the capture and the conversion steps is a crucial step to enhance the economic feasibility of the CCU technology (energy-intensive CO2 separation can be avoided) and thus increase its chances of industrial implementation.
This research was also supported by the project CAPTIN and CAPTIN-2 (under the Moonshot initiative of VLAIO/Catalisti, Grant number HBC.2019.0076 and HBC.2021.0255).
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