title: Study of Electrochemical Reduction of CO2for Future Use in Secondary Microbial Electrochemical Technologies.
abstract: The fluctuation and decentralization of renewable energy have triggered the search for respective energy storage and utilization. At the same time, a sustainable bioeconomy calls for the exploitation of CO2as feedstock. Secondary microbial electrochemical technologies (METs) allow both challenges to be tackled because the electrochemical reduction of CO2can be coupled with microbial synthesis. Because this combination creates special challenges, the electrochemical reduction of CO2was investigated under conditions allowing microbial conversions, that is, for their future use in secondary METs. A reproducible electrodeposition procedure of In on a graphite backbone allowed a systematic study of formate production from CO2with a high number of replicates. Coulomb efficiencies and formate production rates of up to 64.6±6.8 % and 0.013±0.002 mmolformateh-1cm-2, respectively, were achieved. Electrode redeposition, reusability, and long-term performance were investigated. Furthermore, the effect of components used in microbial media, that is, yeast extract, trace elements, and phosphate salts, on the electrode performance was addressed. The results demonstrate that the integration of electrochemical reduction of CO2in secondary METs can become technologically relevant.
authors.affiliation: UFZ-Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: Carla
authors.initials: C
authors.lastname: Gimkiewicz
authors.affiliation: UFZ-Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: Richard
authors.initials: R
authors.lastname: Hegner
authors.affiliation: UFZ-Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: Mareike F
authors.initials: MF
authors.lastname: Gutensohn
authors.affiliation: UFZ-Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: Christin
authors.identifier: 0000-0001-7173-8246
authors.initials: C
authors.lastname: Koch
authors.affiliation: UFZ-Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: Falk
authors.identifier: 0000-0002-0014-4640
authors.initials: F
authors.lastname: Harnisch
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology*; D002245:Carbon Dioxide / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D005561:Formates / Q000737:chemistry; D010084:Oxidation-Reduction; D010710:Phosphates / Q000737:chemistry; D014131:Trace Elements / Q000737:chemistry
chemical_list: D005561:Formates; D010710:Phosphates; D014131:Trace Elements; C030544:formic acid; D002245:Carbon Dioxide
keywords: carbon dioxide; electrocatalysis; electrochemistry; microbial electrochemical technologies; reduction