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A study on Plants Microbial Fuel Cells (PMFC) found that treatment of substrate with natural materials, plant roots volume, and temperature/humidity control significantly increase electric potential and current density.

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Single-chamber air-cathode MFCRepresentative model
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Representative single-chamber air-cathode MFC — matched on the paper’s reported configuration, not its exact geometry.

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What they did

System
MFC
Substrate
complex media
Inoculum
Chlorophytum comosum plants

What worked

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Abstract

Plants Microbial Fuel Cells (PMFC) is a new technology that generates electricity in a renewable, clean and sustainable way. In spite of these advantages, it still faces limitations in power generation and current density, reaching lower production values than other renewable technologies. Different studies maintain that the high resistivity of the cathode is the main limitation in the generation of energy; therefore, non-metallic materials to obtain a better performance are replacing the metallic electrodes. The implementation of these materials applied to PMFC requires a complex interdisciplinary work. Through three experimental tests using metallic electrodes for the extraction of electrons, this research study shows that the treatment of the substrate with natural materials, the volume plant roots, and substrate temperature and humidity control have a significant influence in the increase of the electric potential and the generated current.

Key findings

  • High resistivity of cathode is the main limitation in energy generation
  • Non-metallic materials improve performance and replace metallic electrodes
  • Substrate treatment, plant roots volume, and temperature/humidity control increase electric potential and current density

Keywords

Microbial fuel cellRenewable energyElectricity generationElectricityCurrent (fluid)Cathode

Identifiers

DOI
10.20944/preprints201909.0202.v1
Journal
Preprints.org
Year
2019