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A three-chamber electrochemical cell facilitated biogas upgrading and high-purity oxygen production

Mohammadpour, H., Pivrikas, A., Cheng, K.Y. and Ho, G.ORCID: 0000-0001-9190-8812 (2022) A three-chamber electrochemical cell facilitated biogas upgrading and high-purity oxygen production. Journal of Applied Electrochemistry .

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Anion exchange membrane (AEM)-equipped electrochemical cells can be used for removing the carbon dioxide (CO2) from biogas, thereby upgrading its energy content. The CO2 absorbed in the catholyte can be transported across the AEM as (bi)carbonate and then recovered in the anodic chamber of the electrochemical cell. However, CO2 regeneration in the anode chamber diminishes the oxygen (O2) content in the anodic gas stream. Given this electrochemically produced oxygen can have a high-industrial application value, such as for promoting more efficient biological wastewater treatment processes, we hereby proposed and validated a three-chamber electrochemical cell configuration capable of removing CO2 and recovering it in an intermediate chamber, with a concomitant anodic generation of high-purity O2 gas. Our prototype successfully facilitated CO2 recovery in a separate chamber preventing CO2 contamination of the anodic O2 gas stream. Results also suggested that an approximately tenfold increase in CO2 loading rate enhanced the relative CO2 diffusion flux from 5 to 43% through the AEM, by lowering the catholyte pH as well as improving gas–liquid CO2 transfer. A mathematical model was also developed to accurately predict the polarization performance of the electrochemical cell.

Item Type: Journal Article
Murdoch Affiliation(s): Engineering and Energy
Publisher: Kluwer Academic Publishers
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