Journal
FRONTIERS IN MICROBIOLOGY
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2022.947550
Keywords
carbon dioxide valorization; microbial electrosynthesis; microbial electron uptake; extracellular electron transfer; oxygen stress
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Funding
- Helmholtz Association
- Deutsche Forschungsgemeinschaft [445388719]
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Microbial electrosynthesis utilizes electrons from cathodes to drive the metabolism of microorganisms, converting CO2 into chemicals and fuels. However, the presence of oxygen from the anode reaction can be toxic and reduce efficiency, leading to a need for new reactor designs or alternative oxidation reactions.
Microbial electrosynthesis (MES) from CO2 provides chemicals and fuels by driving the metabolism of microorganisms with electrons from cathodes in bioelectrochemical systems. These microorganisms are usually strictly anaerobic. At the same time, the anode reaction of bioelectrochemical systems is almost exclusively water splitting through the oxygen evolution reaction (OER). This creates a dilemma for MES development and engineering. Oxygen penetration to the cathode has to be excluded to avoid toxicity and efficiency losses while assuring low resistance. We show that this dilemma derives a strong need to identify novel reactor designs when using the OER as an anode reaction or to fully replace OER with alternative oxidation reactions.
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