Microbial Electrosynthesis Using 3D Bioprinting of Sporomusa ovata on Copper, Stainless-Steel, and Titanium Cathodes for CO2 Reduction

Acetate can be produced from carbon dioxide (CO2) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on electrolytically-produced hydrogen (H2). However, the low solubility of H2 can limit the process. Using metal cathodes to generate H2 at a high...

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Published inFermentation (Basel) Vol. 10; no. 1; p. 34
Main Authors Bajracharya, Suman, Krige, Adolf, Matsakas, Leonidas, Rova, Ulrika, Christakopoulos, Paul
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2024
Subjects
3-D printers
acetates
Acetic acid
alginates
Alginic acid
Bacteria
biocathodes
Biocompatibility
biofilm
Biofilms
bioprinting
Carbon dioxide
Cathodes
CO2 reduction
Copper
corrosion-resistance
electricity
Electrodes
Electrons
electrosynthesis
fermentation
Gases
Heavy metals
hydrogels
Hydrogen
hydrogen evolution
metal-biocathode
microbial electrosynthesis
Microorganisms
Productivity
Reactors
Silver chloride
solubility
Sporomusa ovata
Stainless steel
Titanium
Germany
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Abstract Acetate can be produced from carbon dioxide (CO2) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on electrolytically-produced hydrogen (H2). However, the low solubility of H2 can limit the process. Using metal cathodes to generate H2 at a high rate can improve MES. Immobilizing bacteria on the metal cathode can further proliferate the H2 availability to the bacteria. In this study, we investigated the performances of 3D bioprinting of Sporomusa ovata on three metal meshes—copper (Cu), stainless steel (SS), and titanium (Ti), when used individually as a cathode in MES. Bacterial cells were immobilized on the metal using a 3D bioprinter with alginate hydrogel ink. The bioprinted Ti mesh exhibited higher acetate production (53 ± 19 g/m2/d) at −0.8 V vs. Ag/AgCl as compared to other metal cathodes. More than 9 g/L of acetate was achieved with bioprinted Ti, and the least amount was obtained with bioprinted Cu. Although all three metals are known for catalyzing H2 evolution, the lower biocompatibility and chemical stability of Cu hampered its performance. Stable and biocompatible Ti supported the bioprinted S. ovata effectively. Bioprinting of synthetic biofilm on H2-evolving metal cathodes can provide high-performing and robust biocathodes for further application of MES.
AbstractList Acetate can be produced from carbon dioxide (CO₂) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on electrolytically-produced hydrogen (H₂). However, the low solubility of H₂ can limit the process. Using metal cathodes to generate H₂ at a high rate can improve MES. Immobilizing bacteria on the metal cathode can further proliferate the H₂ availability to the bacteria. In this study, we investigated the performances of 3D bioprinting of Sporomusa ovata on three metal meshes—copper (Cu), stainless steel (SS), and titanium (Ti), when used individually as a cathode in MES. Bacterial cells were immobilized on the metal using a 3D bioprinter with alginate hydrogel ink. The bioprinted Ti mesh exhibited higher acetate production (53 ± 19 g/m²/d) at −0.8 V vs. Ag/AgCl as compared to other metal cathodes. More than 9 g/L of acetate was achieved with bioprinted Ti, and the least amount was obtained with bioprinted Cu. Although all three metals are known for catalyzing H₂ evolution, the lower biocompatibility and chemical stability of Cu hampered its performance. Stable and biocompatible Ti supported the bioprinted S. ovata effectively. Bioprinting of synthetic biofilm on H₂-evolving metal cathodes can provide high-performing and robust biocathodes for further application of MES.
Acetate can be produced from carbon dioxide (CO2) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on electrolytically-produced hydrogen (H2). However, the low solubility of H2 can limit the process. Using metal cathodes to generate H2 at a high rate can improve MES. Immobilizing bacteria on the metal cathode can further proliferate the H2 availability to the bacteria. In this study, we investigated the performances of 3D bioprinting of Sporomusa ovata on three metal meshes—copper (Cu), stainless steel (SS), and titanium (Ti), when used individually as a cathode in MES. Bacterial cells were immobilized on the metal using a 3D bioprinter with alginate hydrogel ink. The bioprinted Ti mesh exhibited higher acetate production (53 ± 19 g/m2/d) at −0.8 V vs. Ag/AgCl as compared to other metal cathodes. More than 9 g/L of acetate was achieved with bioprinted Ti, and the least amount was obtained with bioprinted Cu. Although all three metals are known for catalyzing H2 evolution, the lower biocompatibility and chemical stability of Cu hampered its performance. Stable and biocompatible Ti supported the bioprinted S. ovata effectively. Bioprinting of synthetic biofilm on H2-evolving metal cathodes can provide high-performing and robust biocathodes for further application of MES.
Author Krige, Adolf
Bajracharya, Suman
Matsakas, Leonidas
Christakopoulos, Paul
Rova, Ulrika
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crossref_primary_10_1007_s11783_025_1921_y
crossref_primary_10_1039_D4CB00099D
crossref_primary_10_1080_10643389_2024_2382498
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Snippet Acetate can be produced from carbon dioxide (CO2) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on...
Acetate can be produced from carbon dioxide (CO₂) and electricity using bacteria at the cathode of microbial electrosynthesis (MES). This process relies on...
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SubjectTerms 3-D printers
acetates
Acetic acid
alginates
Alginic acid
Bacteria
biocathodes
Biocompatibility
biofilm
Biofilms
bioprinting
Carbon dioxide
Cathodes
CO2 reduction
Copper
corrosion-resistance
electricity
Electrodes
Electrons
electrosynthesis
fermentation
Gases
Heavy metals
hydrogels
Hydrogen
hydrogen evolution
metal-biocathode
microbial electrosynthesis
Microorganisms
Productivity
Reactors
Silver chloride
solubility
Sporomusa ovata
Stainless steel
Titanium
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Title Microbial Electrosynthesis Using 3D Bioprinting of Sporomusa ovata on Copper, Stainless-Steel, and Titanium Cathodes for CO2 Reduction
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