MESSAI.iO

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An air-cathode MFC with a pre-enriched microbial culture achieved startup in under 10 days, with cathode-limited power output indicated by impedance changes.

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Literature priors

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Distribution

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What they did

System
MFC

What worked

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Abstract

Impedance changes of the anode, cathode and solution were examined for an air-cathode microbial fuel cell (MFC) under varying conditions. An MFC inoculated with a pre-enriched microbial culture resulted in a startup time of less than ten days. Over this period, the anode impedance decreased below the cathode impedance, suggesting a cathode-limited power output. Increasing the anode flow rate did not impact the anode impedance significantly, but it decreased the cathode impedance by 65%. Increasing the anode-medium ionic strength also decreased the cathode impedance. These impedance results provide insight into electron and proton transport mechanisms and can be used to improve MFC performance.

Key findings

  • Increasing anode flow rate decreased cathode impedance by 65%
  • Increasing anode-medium ionic strength also decreased cathode impedance
  • Anode impedance decreased below cathode impedance, suggesting cathode-limited power output

Keywords

CathodeMicrobial fuel cellAnodeDielectric spectroscopyElectrical impedanceElectrochemistry

Identifiers

DOI
10.3390/en3040592
Journal
Energies
Year
2010