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H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)

Microbial electrosynthesis (MES) converts CO(2) into value-added products such as volatile fatty acids (VFAs) with minimal energy use, but low production titer has limited scale-up and commercialization. Mediated electron transfer via H(2) on the MES cathode has shown a higher conversion rate than t...

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Detalles Bibliográficos
Autores principales: Bian, Yanhong, Leininger, Aaron, May, Harold D., Ren, Zhiyong Jason
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10637882/
https://www.ncbi.nlm.nih.gov/pubmed/37961049
http://dx.doi.org/10.1016/j.ese.2023.100324
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author Bian, Yanhong
Leininger, Aaron
May, Harold D.
Ren, Zhiyong Jason
author_facet Bian, Yanhong
Leininger, Aaron
May, Harold D.
Ren, Zhiyong Jason
author_sort Bian, Yanhong
collection PubMed
description Microbial electrosynthesis (MES) converts CO(2) into value-added products such as volatile fatty acids (VFAs) with minimal energy use, but low production titer has limited scale-up and commercialization. Mediated electron transfer via H(2) on the MES cathode has shown a higher conversion rate than the direct biofilm-based approach, as it is tunable via cathode potential control and accelerates electrosynthesis from CO(2). Here we report high acetate titers can be achieved via improved in situ H(2) supply by nickel foam decorated carbon felt cathode in mixed community MES systems. Acetate concentration of 12.5 g L(−1) was observed in 14 days with nickel-carbon cathode at a poised potential of −0.89 V (vs. standard hydrogen electrode, SHE), which was much higher than cathodes using stainless steel (5.2 g L(−1)) or carbon felt alone (1.7 g L(−1)) with the same projected surface area. A higher acetate concentration of 16.0 g L(−1) in the cathode was achieved over long-term operation for 32 days, but crossover was observed in batch operation, as additional acetate (5.8 g L(−1)) was also found in the abiotic anode chamber. We observed the low Faradaic efficiencies in acetate production, attributed to partial H(2) utilization for electrosynthesis. The selective acetate production with high titer demonstrated in this study shows the H(2)-mediated electron transfer with common cathode materials carries good promise in MES development.
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spelling pubmed-106378822023-11-13 H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2) Bian, Yanhong Leininger, Aaron May, Harold D. Ren, Zhiyong Jason Environ Sci Ecotechnol Original Research Microbial electrosynthesis (MES) converts CO(2) into value-added products such as volatile fatty acids (VFAs) with minimal energy use, but low production titer has limited scale-up and commercialization. Mediated electron transfer via H(2) on the MES cathode has shown a higher conversion rate than the direct biofilm-based approach, as it is tunable via cathode potential control and accelerates electrosynthesis from CO(2). Here we report high acetate titers can be achieved via improved in situ H(2) supply by nickel foam decorated carbon felt cathode in mixed community MES systems. Acetate concentration of 12.5 g L(−1) was observed in 14 days with nickel-carbon cathode at a poised potential of −0.89 V (vs. standard hydrogen electrode, SHE), which was much higher than cathodes using stainless steel (5.2 g L(−1)) or carbon felt alone (1.7 g L(−1)) with the same projected surface area. A higher acetate concentration of 16.0 g L(−1) in the cathode was achieved over long-term operation for 32 days, but crossover was observed in batch operation, as additional acetate (5.8 g L(−1)) was also found in the abiotic anode chamber. We observed the low Faradaic efficiencies in acetate production, attributed to partial H(2) utilization for electrosynthesis. The selective acetate production with high titer demonstrated in this study shows the H(2)-mediated electron transfer with common cathode materials carries good promise in MES development. Elsevier 2023-09-28 /pmc/articles/PMC10637882/ /pubmed/37961049 http://dx.doi.org/10.1016/j.ese.2023.100324 Text en © 2023 The Authors https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research
Bian, Yanhong
Leininger, Aaron
May, Harold D.
Ren, Zhiyong Jason
H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title_full H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title_fullStr H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title_full_unstemmed H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title_short H(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from CO(2)
title_sort h(2) mediated mixed culture microbial electrosynthesis for high titer acetate production from co(2)
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10637882/
https://www.ncbi.nlm.nih.gov/pubmed/37961049
http://dx.doi.org/10.1016/j.ese.2023.100324
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