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Item type:Publication, Access status: with files , Untersuchung der Elektromethanogenese als eine mögliche Speichertechnologie für erneuerbare Energien(2025); Electromethanogenesis is a technology for converting carbon dioxide into methane. In the case of direct electromethanogenesis (-300 mV vs. SHE), without abiotically produced hydrogen, no significant methane production could be measured. In the case of indirect electromethanogenesis (-700 mV vs. SHE), with abiotically produced hydrogen, a daily methane production of 61 mmol/(m² d) with a coulombic efficiency of 73 % could be achieved using Methanococcus maripaludis. The simulation of a day-night cycle of a photovoltaic system demonstrated the flexibility of electromethanogenesis, which is essential for future storage technologies.Publicationtype: Doctoral Thesis38 39 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Screening of pure cultures for their efficiency to convert electricity and CO₂ into methaneThe demand for defossilization and decarbonization resulting from the climate crisis and the lack of storable renewable energy has brought biomethane back into focus. Methanogenic microorganisms can be used to convert renewable energy into biomethane. In a pressurized H-cell reactor, we demonstrate the electroactivity of four different methanogenic archaea under conditions of direct and indirect electromethanogenesis. The cathodes were adjusted to a potential of −300 mV (direct electromethanogenesis) and − 700 mV (indirect electromethanogenesis) relative to a standard hydrogen electrode. At −300 mV, no significant methane formation was observed in all four cultures. At a potential of −700 mV, Methanococcus maripaludis achieved an average daily methane production rate of 61 mmol/m2 per day. The highest methane concentration of 199.4 mmol/m2 and the highest coulombic efficiency of 74.0 % were reached within 72 h by Methanococcus maripaludis.Publicationtype: Journal Article12 76