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A double-compartment microbial fuel cell using Shewanella spp. strains generated electrical energy with a maximum current density of 0.11 mA cm⁻² and a coulombic efficiency of 65% under anaerobic conditions.

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Literature priors

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Coulombic efficiency65%

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What they did

System
MFC

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Abstract

Abstract This study is focused on electrical energy generation in a double-compartment microbial fuel cell. Carbon felt impregnated with multi-walled carbon nanotubes was used as an anode, which contained gold nanoparticles and Shewanella spp. grown under aerobic conditions was used as a biocatalyst. The electrodes, used before and after biofilm growth, were characterized by scanning electron microscopy and cyclic voltammetry. The results revealed the formation of Shewanella spp. colonies on the electrode surface and electrochemical activity under aerobic and anaerobic conditions. During biofilm growth in Luria Bertani medium, a stabilized average power density of 281 mW m − 2 was recorded. Subsequently, the cell reached a maximum current density of 0.11 mA cm − 2 after 72 h of operation and a coulombic efficiency of 65% under anaerobic conditions.

Key findings

  • The use of carbon felt impregnated with multi-walled carbon nanotubes as an anode and gold nanoparticles enhanced the electrochemical activity.
  • Shewanella spp. colonies formed on the electrode surface and exhibited electrochemical activity under both aerobic and anaerobic conditions.
  • A stabilized average power density of 281 mW m⁻² was recorded during biofilm growth in Luria Bertani medium.

Keywords

Microbial fuel cellBiofilmCyclic voltammetryShewanellaFaraday efficiencyAnode

Identifiers

DOI
10.1186/s42834-020-00073-5
Journal
Sustainable Environment Research
Year
2020