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- Title
Enhancing microbial CO<sub>2</sub> electrocatalysis for multicarbon reduction in a wet amine‐based catholyte.
- Authors
Su Kim, Hui; Lee, Sangmin; Moon, Myounghoon; Jong Jung, Hwi; Lee, Jiye; Chu, Young‐Hwan; Rae Kim, Jung; Kim, Danbee; Woo Park, Gwon; Hyun Ko, Chang; Youn Lee, Soo
- Abstract
Microbial CO2 electroreduction (mCO2ER) offers a promising approach for producing high‐value multicarbon reductants from CO2 by combining CO2 fixing microorganisms with conducting materials (i. e. cathodes). However, the solubility and availability of CO2 in an aqueous electrolyte pose significant limitations in this system. This study demonstrates the efficient production of long‐chain multicarbon reductants, specifically carotenoids (~C40), within a wet amine‐based catholyte medium during mCO2ER. Optimizing the concentration of the biocompatible CO2 absorbent, monoethanolamine (MEA), led to enhanced CO2 fixation in the electroautotroph bacteria. Molecular biological analyses revealed that MEA in the catholyte medium redirected the carbon flux towards carotenoid biosynthesis during mCO2ER. The faradaic efficiency of mCO2ER with MEA for carotenoid production was 4.5‐fold higher than that of the control condition. These results suggest the mass transport bottleneck in bioelectrochemical systems could be effectively addressed by MEA‐assissted mCO2ER, enabling highly efficient production of valuable products from CO2.
- Subjects
ELECTROCATALYSIS; AQUEOUS electrolytes; CARBON dioxide; ELECTROLYTIC reduction; REDUCING agents; CAROTENOIDS
- Publication
ChemSusChem, 2024, Vol 17, Issue 11, p1
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.202301342