MESSAI.iO
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

What worked

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Abstract

Abstract Microbial electrosynthesis (MES) can efficiently convert CO 2 into valuable chemicals. A biocathode, which plays central role in MES process, is expected to have very high surface area and catalytic activity to derive the cathodic reaction flawlessly. In this study, a highly porous bimetallic Fe x MnO y ( x =1, 2 and y =3, 4) microsphere was synthesized and applied as cathode catalyst in a single chamber MES. MES having Fe x MnO y exhibited higher net acetate production rate (204 mM/m 2 d) and coulombic efficiency (58 %) than the MES without catalyst (180 mM/m 2 d and 34 %). The excellent performance of MES with Fe x MnO y was attributed to the high Brunauer‐Emmett‐Teller (BET) surface area (around 278 m 2 /g) with rough surface and efficient electron transfer from cathode to microorganism promoted by Fe x MnO y complex. The cathode with Fe x MnO y reduced charge transfer resistance by ∼70 % and enhanced the exchange current density by 7.2‐times compared to plain cathode. This study suggests that Fe x MnO y can be used as the highly efficient and low‐cost catalyst on cathode of scaled up MESs.

Keywords

CathodeCatalysisElectrosynthesisFaraday efficiencyChemical engineeringBimetallic stripPorosityMaterials scienceElectron transferCathodic protectionAnodeElectrodeChemistryElectrochemistryNanotechnologyPhysical chemistryOrganic chemistryComposite material

Identifiers

DOI
10.1002/celc.201901427
Journal
ChemElectroChem
Year
2019