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Specialized MES research in optimization focusing on performance-optimization, substrates. Abstract Electron‐transfer pathways occurring in biocathodes are still unknown. We demonstrate her...

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Microbial electrochemical systemRepresentative model
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Representative microbial electrochemical system — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MES

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Abstract

Abstract Electron‐transfer pathways occurring in biocathodes are still unknown. We demonstrate here that high rates of acetate production by microbial electrosynthesis are mainly driven by an electron flux from the electrode to carbon dioxide, occurring via biologically induced hydrogen, with (99±1) % electron recovery into acetate. Nevertheless, acetate production is shown to occur exclusively within the biofilm. The acetate producers, putatively Acetoanaerobium , showed the remarkable ability to consume a high H 2 flux before it could escape from the biofilm. At zero wastage of H 2 gas, it allows superior production rates and lesser technical bottlenecks over technologies that rely on mass transfer of H 2 to microorganisms suspended in aqueous solution. This study suggests that bacterial modification of the electrode surface (possibly via synthesis of Cu nanoparticles) is directly involved in the significant enhancement of the hydrogen production.

Keywords

ElectrosynthesisCarbon dioxideHydrogen productionBiofilmElectron transferChemical engineering

Identifiers

DOI
10.1002/celc.201500530
Journal
ChemElectroChem
Year
2016