The advent of renewable energy conversion systems exacerbates the existing issue of intermittent excess power. Microbial electrosynthesis can use this power to capture CO2 and produce multicarbon compounds as a form of energy storage. As catalysts, microbial populations can be used, provided side reactions such as methanogenesis are avoided. Here a simple but effective approach is presented based on enrichment of a robust microbial community via several culture transfers with H2:CO2 conditions. This culture produced acetate at a concentration of 1.29 ± 0.15 g L–1 (maximum up to 1.5 g L–1; 25 mM) from CO2 at a fixed current of −5 Am–2 in fed-batch bioelectrochemical reactors at high N2:CO2 flow rates. Continuous supply of reducing equivalents enabled acetate production at a rate of 19 ± 2 gm–2d–1 (projected cathode area) in several independent experiments. This is a considerably high rate compared with other unmodified carbon-based cathodes. 58 ± 5% of the electrons was recovered in acetate, whereas 30 ± 1...

https://biblio.ugent.be/publication/6884952/file/6884955.pdf

Selective Enrichment Establishes a Stable Performing Community for Microbial Electrosynthesis of Acetate from CO2

Microbial electrosynthesis (MES) has emerged out with immense potential as by means of microorganisms, we now can, not only produce a variety of chemicals and fuels sustainably but also accelerate or enhance bioremediation. Microbial electrolysis cells and the microbial fuel cells (MFCs) are obvious in this particular context as they mutually utilize microorganisms so as to oxidize inorganic and/or organic matter at the anode and create electrical power and/or H2, correspondingly. The revelation that metabolism in microorganisms could also be run with the help of electrical current has freshly directed to a surfeit of supplementary applications in the production of biochemicals as well as biofuels which are thought to be extremely electron exhaustive. Remarkably, the microbial production of certain biochemicals, termed MES, provides a highly enticing, novel track for the generation of beneficial goods from electricity and/ or even wastewater. This review addresses the principles of this process, challenges faced by this process at present and its possibility in the future, and opportunities that the process has promised to bring in the near future of MES. This review, in the end, proposes a side-by-side comparison between carbon dioxide and organic substrate, and glucose and electricity as a source of reducing power correspondingly.

Microbial electrosynthesis: Carbon dioxide sequestration via bioelectrochemical system

Electromicrobiology of Dissimilatory Sulfur Reducing Bacterium Desulfuromonas

Annual Energy Outlook

/pdf/bioelectrochemical-reduction-of-carbon-dioxide-to-acetate-2pqlu2542r.pdf

Bioelectrochemical Reduction Of Carbon Dioxide To Acetate Using A Microbial Consortium Derived From The C ow Rumen

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Bioelectrochemical Reduction Of Carbon Dioxide To Acetate Using A Microbial Consortium Derived From The C ow Rumen