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Oxygen-reducing microbial cathodes in hypersaline electrolyte.

Mickaël Rimboud1, Mohamed Barakat2, Wafa Achouak2

  • 1Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Allée Emile Monso, 31432 Toulouse, France.

Bioresource Technology
|October 11, 2020
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Summary
This summary is machine-generated.

Researchers developed efficient oxygen-reducing biocathodes for hypersaline microbial fuel cells (MFCs) using salt marsh sediment. These halotolerant cathodes, enriched with specific bacteria, significantly improve MFC performance in high-salt environments.

Keywords:
BiocathodeMicrobial fuel cellOxygen reductionSalt marsh sedimentsThiohalobacter thiocyanaticus

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Area of Science:

  • Environmental Science
  • Electrochemistry
  • Microbiology

Background:

  • Hypersaline environments pose challenges for microbial fuel cells (MFCs) due to low conductivity.
  • While halotolerant bioanodes are established, oxygen-reducing biocathodes remain a performance bottleneck in hypersaline MFCs.

Purpose of the Study:

  • To design and evaluate efficient oxygen-reducing biocathodes for hypersaline MFCs.
  • To identify microbial communities responsible for high performance in these biocathodes.

Main Methods:

  • Utilized salt marsh sediment as inoculum for biocathode development.
  • Employed a hypersaline medium with high conductivity (45 g/L NaCl, 10.4 S m⁻¹).
  • Measured current density and potential, and analyzed microbial community composition.

Main Results:

  • Achieved a current density of up to 2.2 A m⁻² at +0.2 V/SCE.
  • Identified Gammaproteobacteria, particularly strains related to Thiohalobacter thiocyanaticus, as key to biocathode efficiency.
  • Observed significant enrichment of these bacterial strains in high-performing biocathodes.

Conclusions:

  • Successfully designed efficient halotolerant microbial cathodes for hypersaline MFCs.
  • Highlighted specific bacterial strains (Thiohalobacter thiocyanaticus related) for future optimization of hypersaline MFCs.
  • Opened new avenues for overcoming oxygen reduction limitations in hypersaline MFC technology.