Trace metals from microbial growth media form in situ electro-catalysts

de Smit, Sanne M.; van Mameren, Thomas D.; Xie, Yiduo; Strik, David P.B.T.B.; Bitter, Johannes H.

doi:10.1016/j.electacta.2023.142722

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…Most likely, the hydrogen evolution reaction (HER) consumes most of the charge passed through the cathode, as shown in a previous study and also illustrated in a recent study that showed an increased HER with increased amount of trace metals. 18,19 The yield of the conversion in M17 complex media at a low acetoin concentration is lower at 20%, likely due to the unfavourable ratio of acetoin and other medium components. The reproducible results in different complex media suggest that the overall amount of ions and organic substances hinder higher yields and facilitates HER.…”

Section: Resultsmentioning

confidence: 99%

“…This effect has been studied recently and was employed to boost HER when it was desired. 19 In addition to the parasitic HER, the conversion was inherently limited by the side product 2,3-butanediol that consists of two isomers, of which only one is converted to acetoin. 18,20 Therefore, the use of an acetoin solution with a minimal amount of charged, reactive compounds and no other C 4 compounds than acetoin would improve the overall process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acetoin production by resting cells of Lactococcus lactis for direct electrochemical synthesis of 2-butanone

Grütering,

Harhues,

Speen

et al. 2023

Green Chem.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acetoin production by resting cells of Lactococcus lactis for direct electrochemical synthesis of 2-butanone

Grütering,

Harhues,

Speen

et al. 2023

Green Chem.

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Integration of biocompatible hydrogen evolution catalyst developed from metal-mix solutions with microbial electrosynthesis

de Smit,

van Mameren,

van Zwet

et al. 2024

Bioelectrochemistry

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Performance effects from different shutdown methods of three electrode materials for the power-to-gas application with electromethanogenesis

Rohbohm,

Lang,

Erben

et al. 2024

Preprint

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Industrial applications of microbial electrochemical systems will require regular maintenance shutdowns, involving inspections and component replacements to extend the lifespan of the system. Here, we examined the impact of such shutdowns on the performance of three electrode materials (i.e., platinized titanium, graphite, and nickel) as cathodes in a microbial electrochemical system that would be used for electromethanogenesis in power-to-gas applications. We focused on methane (CH4) production from hydrogen (H2) and carbon dioxide (CO2) using Methanothermobacter thermautotrophicus. We showed that the platinized titanium cathode resulted in high volumetric CH4 production rates and Coulombic efficiencies. Using a graphite cathode would be more cost-effective than using the platinized titanium cathode in microbial electrochemical systems but showed an inferior performance. The microbial electrochemical system with the nickel cathode showed improvements compared to the graphite cathode. Additionally, this system with a nickel cathode demonstrated the fastest recovery during a shutdown experiment compared to the other two cathodes. Fluctuations in pH and nickel concentrations in the catholyte during power interruptions affected CH4 production recovery in the system with the nickel cathode. This research enhances understanding of the integration of biological and electrochemical processes in microbial electrochemical systems, providing insights into electrode selection and operating strategies for effective and sustainable CH4 production.

show abstract

Trace metals from microbial growth media form in situ electro-catalysts

Cited by 3 publications

References 49 publications

Acetoin production by resting cells of Lactococcus lactis for direct electrochemical synthesis of 2-butanone

Acetoin production by resting cells of Lactococcus lactis for direct electrochemical synthesis of 2-butanone

Integration of biocompatible hydrogen evolution catalyst developed from metal-mix solutions with microbial electrosynthesis

Performance effects from different shutdown methods of three electrode materials for the power-to-gas application with electromethanogenesis

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